Pressure control system of torque control device

A pressure control system for a torque control device includes a control pressure regulating valve (110) outputting a control pressure, a pressure switching valve (120) and a jointing pressure regulating valve (130) connected to a piston chamber of the torque control device. When the control pressure is lower than a set value of a spring of the pressure switching valve, the jointing pressure regulating valve (130) outputs jointing pressure that is in fixed proportion with the control pressure. When the control pressure reaches the set value of the spring of the pressure switching valve, the jointing pressure regulating valve (130) outputs a jointing pressure that is larger than the fixed proportion with the control pressure. The pressure control system ensures that the torque control device has both precise and large torque capacity.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is the US national phase entry of PCT Application No. PCT/CN2013/081284, entitled “PRESSURE CONTROL SYSTEM OF TORQUE CONTROL DEVICE” filed Aug. 12, 2013. The disclosure of said application is hereby incorporated herein by reference.

TECHNICAL FIELD

The present disclosure relates to the field of hydraulic control, in particular to the field of hydraulic control to an automatic transmission.

BACKGROUND

By now, the following existing techniques have been searched: 1. CN200510127583.5, entitled “Pressure Control Systems for Automatic Transmissions”; 2. CN200510117492.3, entitled “Hydraulic Control Systems for Automatic Transmission Units for Vehicles”; 3. U.S. Pat. No. 6,591,958, entitled “Pressure Control Apparatus for a Torque-transmitting Mechanism”; and 4. CN200510084452.3, entitled “Regulating valves of torque-transmitting mechanisms and method for engaging torque-transmitting mechanisms”.

In an automatic transmission, the transmission torque of the torque control devices such as clutches, brakes or brake bands mainly depends on a jointing pressure of a piston chamber thereof. During the jointing process of the torque control devices such as clutches, the transmission torque thereof is controlled by controlling the jointing pressure. A TCU (short for automatic Transmission Control Unit, alternatively translated as Electronic Control Device) outputs a signal to control an electromagnetic valve, and a pressure of the electromagnetic valve controls a pressure regulating valve to provide this jointing pressure, wherein the pressure of the electromagnetic valve serves as a pilot control valve. Thus, if it is desired to ensure an adequate torque capacity, the resolution of a pressure control will reduce, which is disadvantageous for the precise control to a torque device.

SUMMARY

An object of the present disclosure is to provide a control system which is advantageous for precise control to a pressure of a torque control device.

To achieve above object, the present disclosure adopts any one of the following technical solutions.

A pressure control system for a torque control device, the system comprises: an electronic control device (TCU); a control pressure regulating valve for receiving a control signal from the electronic control device (TCU) and outputting a control pressure; a fixed pressure oil passage, which is an oil passage for supplying oil to the control pressure regulating valve; a pressure switching valve, which has an input interface for receiving a jointing pressure, an input interface for receiving a fixed pressure, an output interface connected to a feedback interface of a jointing pressure regulating valve, and a control interface located on one side of a valve core of the pressure switching valve and connected to an oil passage of the control pressure; a jointing pressure regulating valve, which has an input interface connected to an oil passage of a system main oil pressure, an output interface of a jointing pressure for a piston chamber of a torque transmission device, a feedback interface and a spring chamber that are located on one side of a valve core of the jointing pressure regulating valve and used for receiving a pressure output from the pressure switching valve, and a control interface located on the other side of the valve core of the jointing pressure regulating valve and connected to the oil passage of the control pressure; and when the control pressure is lower than a set value of a spring of the pressure switching valve, the pressure switching valve connects the jointing pressure with the feedback interface of the jointing pressure regulating valve, and the jointing pressure regulating valve outputs a jointing pressure in proportion to the control signal; and, when the control pressure reaches the set value of the spring of the pressure switching valve, the pressure switching valve connects the fixed pressure with the feedback interface of the jointing pressure regulating valve, and the jointing pressure regulating valve allows a main pressure interface to communicate with a jointing pressure interface.

A pressure control system for a torque control device, the system comprises: an electronic control device (TCU); a control pressure regulating valve for receiving a control signal from the electronic control device (TCU) and outputting a control pressure; a fixed pressure oil passage, which is an oil passage for supplying oil to the control pressure regulating valve; a pressure switching valve, which has an input interface for receiving a jointing pressure, an input interface for receiving a control pressure, an output interface connected to a feedback interface of a jointing pressure regulating valve, and a control interface located on one side of a valve core of the pressure switching valve and connected to an oil passage of the control pressure; a jointing pressure regulating valve, which has an input interface connected to an oil passage of a system main oil pressure, an output interface of a jointing pressure for a piston chamber of a torque transmission device, and a feedback interface and a spring chamber that are located on one side of a valve core of the jointing pressure regulating valve and used for receiving a pressure output from the pressure switching valve; and when the control pressure is lower than a set value of a spring of the pressure switching valve, the pressure switching valve connects the jointing pressure with the feedback interface of the jointing pressure regulating valve, and the jointing pressure control valve outputs a jointing pressure in proportion to the control signal; and, when the control pressure reaches the set value of the spring of the pressure switching valve, the pressure switching valve connects the control pressure with the feedback interface of the jointing pressure regulating valve, and the jointing pressure regulating valve allows a main pressure interface to communicate with a jointing pressure interface.

A pressure control system for a torque control device, the system comprises: an electronic control device (TCU); a control pressure regulating valve for receiving a control signal from the electronic control device (TCU) and outputting a control pressure; a fixed pressure oil passage, which is an oil passage for supplying oil to the control pressure regulating valve; a pressure switching valve, which has an input interface for receiving a jointing pressure, an input interface for receiving the control pressure, an output interface connected to a control interface of a jointing pressure regulating valve, and a control interface located on one side of a valve core of the pressure switching valve and connected to an oil passage of the control pressure; a jointing pressure regulating valve, which has an input interface connected to an oil passage of a system main oil pressure, an output interface of a jointing pressure for a piston chamber of a torque transmission device, a feedback interface and a spring chamber that are located on one side of a valve core of the jointing pressure regulating valve and used for receiving a jointing pressure, and a control interface located on the other side of the valve core of the jointing pressure regulating valve and used for receiving an output of the pressure switching valve; and when the control pressure is lower than a set value of a spring of the pressure switching valve, the pressure switching valve connects the control pressure with the control interface of the jointing pressure regulating valve, and the jointing pressure regulating valve outputs a jointing pressure in proportion to the control signal; and, when the control pressure reaches the set value of the spring of the pressure switching valve, the pressure switching valve connects the jointing pressure with the control interface of the jointing pressure regulating valve, and the jointing pressure regulating valve allows a main pressure interface to communicate with a jointing pressure interface.

A pressure control system for a torque control device, the system comprises: an electronic control device (TCU); a control pressure regulating valve for receiving a control signal from the electronic control device (TCU) and outputting a control pressure; a fixed pressure oil passage, which is an oil passage for supplying oil to the control pressure regulating valve; a pressure switching valve, which has an input interface for receiving a jointing pressure, an input interface for receiving a pressure relief chamber, an output interface connected to a control interface of a jointing pressure regulating valve, and a control interface located on one side of a valve core of the pressure switching valve and connected to an oil passage of the control pressure; a selecting valve, which consists of a steel ball and has a first input port for receiving the control pressure, a second input port for receiving an output of the pressure switching valve and an output port connected to a control chamber of a jointing pressure regulating valve, the output port being always in communication with an input port having a larger pressure; a jointing pressure regulating valve, which has an input interface connected to an oil passage of a system main oil pressure, an output interface of a jointing pressure for a piston chamber of a torque transmission device, a feedback interface and a spring chamber that are located on one side of a valve core of the jointing pressure regulating valve and used for receiving a jointing pressure, and a control interface located on the other side of the valve core of the jointing pressure regulating valve and used for receiving an output of the selecting valve; and when the control pressure is lower than a set value of a spring of the pressure switching valve, the pressure switching valve connects an oil drainage chamber with an input interface of the selecting valve, the control pressure enters a control chamber of the jointing pressure control valve via the selecting valve, and the jointing pressure control valve outputs a jointing pressure in proportion to the control signal; and, when the control pressure reaches the set value of the spring of the pressure switching valve, the pressure switching valve connects the jointing pressure with an input of the selecting valve, the jointing pressure is connected to the control interface of the jointing pressure regulating valve via the selecting valve, and the jointing pressure regulating valve allows a main pressure interface to communicate with a jointing pressure interface.

A pressure control system for a torque control device, the system comprises: an electronic control device (TCU); a control pressure regulating valve for receiving a control signal from the electronic control device (TCU) and outputting a control pressure; a fixed pressure oil passage, which is an oil passage for supplying oil to the control pressure regulating valve; a pressure switching valve, which has an input interface for receiving a jointing pressure, an input interface for receiving an oil drainage chamber, an output interface connected to a control interface of a jointing pressure regulating valve, and a control interface located on one side of a valve core of the pressure switching valve and connected to an oil passage of the control pressure; a jointing pressure regulating valve, which has an input interface connected to an oil passage of a system main oil pressure, an output interface of a jointing pressure for a piston chamber of a torque transmission device, a feedback interface and a spring chamber that are located on one side of a valve core of the jointing pressure regulating valve and used for receiving a jointing pressure, and a control interface for receiving an output of the pressure switching valve and a second control interface for receiving the control pressure located on the other side of the valve core of the jointing pressure regulating valve; and when the control pressure is lower than a set value of a spring of the pressure switching valve, the pressure switching valve connects a pressure relief chamber with the control interface of the jointing pressure regulating valve, and the jointing pressure regulating valve outputs a jointing pressure in proportion to the control signal; and, when the control pressure reaches the set value of the spring of the pressure switching valve, the pressure switching valve connects the jointing pressure with the control interface of the jointing pressure regulating valve, and the jointing pressure regulating valve allows a main pressure interface to communicate with a jointing pressure interface.

According to above five technical solutions, the control pressure regulating valve is generally an electromagnetic valve. The pressure while the torque control devices are jointed is controlled by a precise control to the control pressure of the electromagnetic valve. In addition, after the torque transmission devices are jointed and when the pressure of the electromagnetic valve exceeds a set value, a high pressure oil port in the pressure regulating valve is communicated with a piston chamber of the torque control device by means of the pressure switching valve, so as to ensure an adequate torque capacity.

Two other pressure control systems, which can also achieve the above objective, will be further provided as below.

A pressure control system for a torque control device, the system comprises: an electronic control device (TCU); a control pressure regulating valve for receiving a control signal from the electronic control device (TCU) and outputting a control pressure; a fixed pressure oil passage, which is an oil passage for supplying oil to the control pressure regulating valve; a pressure switching valve, which has an input interface for receiving the control pressure, an input interface for receiving a pressure relief chamber, an output interface connected to a reverse control interface of a jointing pressure regulating valve, and a control interface located on one side of a valve core of the pressure switching valve and connected to an oil passage of the control pressure; a jointing pressure regulating valve, which has an input interface connected to an oil passage of a system main oil pressure, an output interface of a jointing pressure for a piston chamber of a torque transmission device, a feedback interface and a spring chamber that are located on one side of a valve core of the jointing pressure regulating valve and used for receiving a jointing pressure, a control interface located on the other side of the valve core of the jointing pressure regulating valve and connected to the oil passage of the control pressure; and a reverse control interface which has a reverse apply direction to the control interface; when the control pressure is lower than a set value of a spring of the pressure switching valve, the pressure switching valve connects the control pressure with the reverse control interface of the jointing pressure regulating valve, and the jointing pressure regulating valve outputs a jointing pressure with a smaller slope; and, when the control pressure reaches the set value of the spring of the pressure switching valve, the pressure switching valve connects the pressure relief chamber with the reverse control interface of the jointing pressure regulating valve, and the jointing pressure regulating valve outputs a jointing pressure with a larger variation slope.

A pressure control system for a torque control device, the system comprises: an electronic control device (TCU); a control pressure regulating valve for receiving a control signal from the electronic control device (TCU) and outputting a control pressure; a fixed pressure oil passage, which is an oil passage for supplying oil to the control pressure regulating valve; a pressure switching valve, which has an input interface for receiving a jointing pressure, an input interface for receiving an oil drainage chamber, an output interface connected to a feedback interface of a jointing pressure regulating valve, and a control interface located on one side of a valve core of the pressure switching valve and connected to an oil passage of the control pressure; a jointing pressure regulating valve, which has an input interface connected to an oil passage of a system main oil pressure, an output interface of a jointing pressure for a piston chamber of a torque transmission device, a feedback interface and a spring chamber for receiving a pressure output from the pressure switching valve and a second feedback port connected to an output of the pressure jointing valve that are located on one side of a valve core of the jointing pressure regulating valve, and a control interface located on the other side of the valve core of the jointing pressure regulating valve and used for receiving the control pressure; and when the control pressure is lower than a set value of a spring of the pressure switching valve, the pressure switching valve connects the jointing pressure with the feedback interface of the jointing pressure regulating valve, a feedback area of the jointing pressure regulating valve is increased, and the jointing pressure regulating valve outputs a jointing pressure with a smaller variation slope and being in proportion to the control signal; and, when the control pressure reaches the set value of the spring of the pressure switching valve, the pressure switching valve connects a pressure relief port with the feedback interface of the jointing pressure regulating valve, the feedback area of the jointing pressure regulation valve is decreased, and the jointing pressure regulating valve outputs a jointing pressure with a larger variation slope and being in proportion to the control signal.

According to the two technical solutions described above, during the torque transmission devices are jointed, by a switching of the pressure switching valve, the apply area of the control pressure of the jointing pressure regulating valve is reduced or the feedback area is increased, it is advantageous for a precise control to the jointing pressure adopting a jointing pressure with a smaller variation slope and being in proportion to the control pressure of the control pressure regulating valve; Furthermore, after the torque transmission devices are jointed, that is, after there is no relative slip, by a switching of the pressure switching valve, the apply area of the control pressure of the jointing pressure regulating valve is increased or the feedback area is reduced, so that the variation slope of the jointing pressure is increased and an adequate torque capacity is ensured.

DETAILED DESCRIPTION

InFIG. 3, a pressure control system includes an Electronic Control device (TCU)100and a control pressure regulating valve110, where the control pressure regulating valve110is generally an electromagnetic valve; a pressure switching valve120, a control interface121located in the pressure switching valve and connected to an oil passage of the control pressure, an input interface122located in the pressure switching valve and used for receiving a jointing pressure, an input interface123located in the pressure switching valve and used for receiving a fixed pressure, a spring chamber or an oil drainage pressure124in the pressure switching valve, an output interface125located in the pressure switching valve and connected to a feedback interface of a jointing pressure regulating valve, a valve core126in the pressure switching valve, and a spring127in the pressure switching valve; and a jointing pressure regulating valve130, a control interface131located in the jointing pressure regulating valve and connected to the oil passage of the control pressure, a pressure relief port132in the jointing pressure regulating valve, a pressure relief port133in the jointing pressure regulating valve, a control interface134located in the jointing pressure regulating valve and connected to a system main oil pressure, a feedback interface and a spring chamber135that are located in the jointing pressure regulating valve and used for receiving a pressure output from the pressure switching valve, an output interface136located in the jointing pressure regulating valve and used for a jointing pressure of a piston chamber, a valve core137in the jointing pressure regulating valve, and a spring138in the jointing pressure regulating valve.

As shown inFIG. 3, the electronic control device (TCU)100outputs a control signal to the control pressure regulating valve110, and the control pressure regulating valve110outputs a pressure in proportion to the control signal, and the output pressure of the control pressure regulating valve110is applied to a control chamber of the jointing pressure regulating valve130and a control chamber of the pressure switching valve120via the control interface131and the control interface121. When the output pressure of the control pressure regulating valve110is lower than a set value of the spring of the pressure switching valve, the input interface122and the output interface125of the pressure switching valve120communicate with each other, and the jointing pressure enters the feedback interface and the spring chamber135of the jointing pressure regulating chamber130via the input interface122and the output interface125. The jointing pressure regulating valve130outputs a jointing pressure in proportion to the control pressure of the control pressure regulating valve110. When the output pressure of the control pressure regulating valve110is higher than the set valve of the spring127of the pressure switching valve120, the input interface123and the output interface125of the pressure switching valve120communicate with each other, the fixed pressure for supplying oil to the control pressure regulating valve110enters the feedback interface135of the feedback chamber of the jointing pressure regulating valve130via the interfaces123and125, the valve core137of the jointing pressure regulating valve130moves rightward, and the control interface134is communicated with the output interface136, so that the jointing pressure is equal to the system main oil pressure.

InFIG. 4, the pressure control system includes an electronic control device (TCU)100and a control pressure regulating valve110, where the control pressure regulating valve110is generally an electromagnetic valve; a pressure switching valve120, a control interface121located in the pressure switching valve and connected to an oil passage of the control pressure, an input interface122located in the pressure switching valve and used for receiving a jointing pressure, an input interface123located in the pressure switching valve and used for receiving a control pressure, a spring chamber or an oil drainage pressure124in the pressure switching valve, an output interface125located in the pressure switching valve and connected to a feedback interface of a jointing pressure regulating valve, a valve core126in the pressure switching valve, and a spring127in the pressure switching valve; and a jointing pressure regulating valve130, a control interface131located in the jointing pressure regulating valve and connected to the oil passage of the control pressure, a pressure relief port132in the jointing pressure regulating valve, a pressure relief port133in the jointing pressure regulating valve, a control interface134located in the jointing pressure regulating valve and connected to a system main oil pressure, a feedback interface and a spring chamber135that are located in the jointing pressure regulating valve and used for receiving a pressure output from the pressure switching valve, an output interface136located in the jointing pressure regulating valve and used for a jointing pressure of a piston chamber, a valve core137in the jointing pressure regulating valve, and a spring138in the jointing pressure regulating valve.

The electronic control device (TCU)100outputs a control signal to the control pressure regulating valve110, then the control pressure regulating valve110outputs a pressure in proportion to the control signal, and the output pressure of the control pressure regulating valve110is applied to a control chamber of the jointing pressure regulating valve130and a control chamber of the pressure switching valve120via the control interface131, the control interface121and the input interface123. When the output pressure of the control pressure regulating valve110is lower than a set value of the spring127of the pressure switching valve120, the input interface122and the output interface125of the pressure switching valve120communicate with each other, and the jointing pressure enters the feedback interface and the spring chamber135of the jointing pressure regulating chamber130via the input interface122and the output interface125. The jointing pressure regulating valve130outputs a jointing pressure in proportion to the control pressure of the control pressure regulating valve110. When the output pressure of the control pressure regulating valve110is higher than the set valve of the spring127of the pressure switching valve120, the input interface123and the output interface125of the pressure switching valve120communicate with each other, the control pressure output from the control pressure regulating valve110enters the feedback interface and spring chamber135of the jointing pressure regulating valve130via the input interface123and the output interface125, the valve core137of the jointing pressure regulating valve130moves rightward, and a system main oil pressure chamber (i.e., the control interface134) is communicated with a piston chamber of a torque control device (i.e., the output interface136), so that the jointing pressure is equal to the system main oil pressure.

InFIG. 5, a pressure control system includes an electronic control device (TCU)100and a control pressure regulating valve110, where the control pressure regulating valve110is generally an electromagnetic valve; a pressure switching valve120, a control interface121located in the pressure switching valve and connected to an oil passage of the control pressure, an input interface122located in the pressure switching valve120and used for receiving a control pressure, an input interface123located in the pressure switching valve and used for receiving a jointing pressure, a spring chamber or an oil drainage pressure124in the pressure switching valve120, an output interface125located in the pressure switching valve and connected to a control interface of a jointing pressure regulating valve, a valve core126in the pressure switching valve, and a spring127in the pressure switching valve; and a jointing pressure regulating valve130, a control interface131located in the jointing pressure regulating valve and used for receiving an output of the pressure switching valve, a pressure relief port132in the jointing pressure regulating valve, a pressure relief port133in the jointing pressure regulating valve, a control interface134located in the jointing pressure regulating valve and connected to a system main oil pressure, a jointing pressure feedback interface and a spring chamber135in the jointing pressure regulating valve, an output interface136located in the jointing pressure regulating valve and used for a jointing pressure of a piston chamber, a valve core137in the jointing pressure regulating valve, and a spring138in the jointing pressure regulating valve.

The electronic control device (TCU)100outputs a control signal to the electromagnetic valve110, the control pressure regulating valve110outputs a pressure in proportion to the control signal, and the output pressure of the control pressure regulating valve110is applied to a control chamber of the pressure switching valve120, i.e., a control chamber where the control interface121is communicated with the input interface122. When the output pressure of the control pressure regulating valve110is lower than a set value of the spring127of the pressure switching valve120, the input interface122and the output interface125of the pressure switching valve120communicate with each other.

The control pressure enters a control chamber (i.e., the control interface131) of the jointing pressure regulating valve130via the input interface122and the output interface125. The jointing pressure regulating valve130outputs a jointing pressure in proportion to the control pressure of the control pressure regulating valve110. When the output pressure of the control pressure regulating valve110is higher than the set valve of the spring127of the pressure switching valve120, a chamber of the input interface123and a chamber of the output interface125of the pressure switching valve120communicate with each other, the jointing pressure enters the control chamber (i.e., the feedback interface and the spring chamber135) of the jointing pressure regulating valve130via the interfaces123and125, the valve core137of the jointing pressure regulating valve130moves rightward, and a system main oil pressure chamber (i.e., the control interface134) is communicated with a piston chamber (i.e., the output interface136) of a torque control device, so that the jointing pressure is equal to the system main oil pressure.

InFIG. 6, a pressure control system includes an electronic control device (TCU)100and a control pressure regulating valve110, where the control pressure regulating valve110is generally an electromagnetic valve; a pressure switching valve120, a control interface121located in the pressure switching valve120and connected to an oil passage of the control pressure, a pressure relief port122in the pressure switching valve120, an input interface123located in the pressure switching valve120and used for receiving a jointing pressure, a spring chamber or an oil drainage pressure124in the pressure switching valve120, an output interface125located in the pressure switching valve120and connected to a second input port12of a selecting valve140, a valve core126in the pressure switching valve120, and a spring127in the pressure switching valve120; a jointing pressure regulating valve130, a control interface131located in the jointing pressure regulating valve130and used for receiving an output of the selecting valve140, a pressure relief port132in the jointing pressure regulating valve130, a pressure relief port133in the jointing pressure regulating valve130, a control interface134located in the jointing pressure regulating valve130and connected to a system main oil pressure, a jointing pressure feedback interface and a spring chamber135in the jointing pressure regulating valve130, an output interface136located in the jointing pressure regulating valve and used for a jointing pressure of a piston chamber, a valve core137in the jointing pressure regulating valve130, and a spring138in the jointing pressure regulating valve130; and a selecting valve140, a first input port141for receiving a control pressure, a second input port142for receiving an output of the pressure switching valve120, and an output port143of the selecting valve140.

The electronic control device (TCU)100outputs a control signal to the control pressure regulating valve110, the control pressure regulating valve110outputs a pressure in proportion to the control signal, and the output pressure of the control pressure regulating valve110is applied to a control chamber (i.e., the control interface121) of the pressure switching valve120and the first input port141of the selecting valve140. When the output pressure of the control pressure regulating valve110is lower than a set value of the spring127of the pressure switching valve120, the pressure relief port122of the pressure switching valve120is communicated with the second input port142of the selecting valve140, and the pressure of an oil drainage chamber enters the second input port (i.e., a control chamber142) of the selecting valve140via the interfaces122and125. The pressure of the control pressure enters the jointing pressure regulating valve130via the first input port141of the selecting valve140, and the control pressure regulating valve outputs a jointing pressure in proportion to the control pressure of the control pressure regulating valve110. When the output pressure of the control pressure regulating valve110is higher than the set valve of the spring127of the pressure switching valve120, the input interface123of the pressure switching valve120is communicated with a chamber of the output interface125, the jointing pressure enters the second input port (i.e., a control chamber142) of the selecting valve via the interfaces123and125, then enters a control chamber (i.e., the control interface131) of the jointing pressure regulating valve130via the selecting valve140, the valve core137of the jointing pressure regulating valve130moves rightward, and the control interface134of a system main oil pressure chamber is communicated with the output interface136of a piston chamber of a torque control device, so that the jointing pressure is equal to the system main oil pressure.

InFIG. 7, a pressure control system includes an electronic control device (TCU)100and a control pressure regulating valve110, where the control pressure regulating valve110is generally an electromagnetic valve; a pressure switching valve120, a control interface121located in the pressure switching valve and connected to an oil passage of the control pressure, a pressure relief port122in the pressure switching valve, an input interface123located in the pressure switching valve and used for receiving a jointing pressure, a spring chamber or an oil drainage pressure124in the pressure switching valve, an output interface125located in the pressure switching valve and connected to a control interface of a jointing pressure regulating valve, a valve core126in the pressure switching valve, and a spring127in the pressure switching valve; and a jointing pressure regulating valve130, a control interface131located in the jointing pressure regulating valve130and used for receiving an output of the pressure switching valve, a control interface132located in the jointing pressure regulating valve130and used for receiving a control pressure, a pressure relief port133in the jointing pressure regulating valve130, a pressure relief port134in the jointing pressure regulating valve130, a control interface135located in the jointing pressure regulating valve130and connected to a system main oil pressure, a jointing pressure feedback interface and a spring chamber136in the jointing pressure regulating valve130, an output interface137located in the jointing pressure regulating valve and used for a jointing pressure of a piston chamber, a spring138in the jointing pressure regulating valve130, a valve core139in the jointing pressure regulating valve130, and a small valve core139ain the jointing pressure regulating valve130.

The electronic control device (TCU)100outputs a control signal to the control pressure regulating valve110, the control pressure regulating valve110outputs a pressure in proportion to the control signal, and the output pressure of the control pressure regulating valve110is applied to a chamber to which a control chamber (i.e. the control interface121) of the pressure switching valve120and the control interface132of the jointing pressure regulating valve110are connected. When the output pressure of the control pressure regulating valve110is lower than a set value of the spring127of the pressure switching valve120, the pressure relief port122of the pressure switching valve120is communicated with a chamber where the output interface125is located, and the pressure of an oil drainage chamber enters a control chamber (i.e., the control interface131) of the jointing pressure regulating valve130via the pressure relief port122and the output interface125. The jointing pressure regulating valve130outputs a jointing pressure in proportion to the control pressure of the control pressure regulating valve110. When the output pressure of the control pressure regulating valve110is higher than the set valve of the spring127of the pressure switching valve120, the input interface123of the pressure switching valve120is communicated with the chamber where the output interface125is located, the jointing pressure enters the control interface131of the jointing pressure regulating valve130via the interfaces123and125and then enters a control chamber of the jointing pressure regulating valve130, the valve core139of the jointing pressure regulating valve130moves rightward, and a system main oil pressure chamber (i.e., the control interface135) is communicated with a piston chamber of a torque control device, i.e., the output interface137of the jointing pressure, so that the jointing pressure is equal to the system main oil pressure.

In Embodiments 1-5 described above, the control pressure regulating valve is generally an electromagnetic valve. The relation between a control pressure and a jointing pressure is shown asFIG. 1, and the pressure while the torque control devices are jointed is controlled by a precise control to the control pressure of the electromagnetic valve. In addition, after the torque transmission devices are jointed and when the pressure of the electromagnetic valve exceeds a set valve, a high pressure oil port in the pressure regulating valve is communicated with a piston chamber of the torque control device by means of the pressure switching valve, so as to ensure an adequate torque capacity.

InFIG. 8, a pressure control system includes an electronic control device (TCU)100and a control pressure regulating valve110, where the control pressure regulating valve110is generally an electromagnetic valve; a pressure switching valve120, a control interface121located in the pressure switching valve and connected to an oil passage of the control pressure, an input interface122located in the pressure switching valve and used for receiving a control pressure, an input interface123located in the pressure switching valve and used for receiving a pressure relief chamber, a spring chamber or an oil drainage pressure124in the pressure switching valve, an output interface125located in the pressure switching valve and connected to a reverse control interface of a jointing pressure regulating valve, a valve core126in the pressure switching valve, and a spring127in the pressure switching valve; and a jointing pressure regulating valve130, a control interface131located in the jointing pressure regulating valve and connected to the oil passage of the control pressure, a pressure relief port132in the jointing pressure regulating valve, a pressure relief port133in the jointing pressure regulating valve, a control interface134located in the jointing pressure regulating valve and connected to a system main oil pressure, a feedback interface and a spring chamber135which are located in the jointing pressure regulating valve and used for receiving a jointing pressure, an output interface136located in the jointing pressure regulating valve and used for a jointing pressure of a piston chamber, a valve core137in the jointing pressure regulating valve, and a spring138in the jointing pressure regulating valve.

The electronic control device (TCU)100outputs a control signal to the control pressure regulating valve110, the control pressure regulating valve110outputs a pressure in proportion to the control signal, and the output pressure of the control pressure regulating valve110is applied to a control chamber (i.e., the control interface131) of the jointing pressure regulating valve130and a control chamber (i.e., the input interface121) of the pressure switching valve120. When the output pressure of the control pressure regulating valve110is lower than a set value of the spring127of the pressure switching valve120, the input interface122of the pressure switching valve120is communicated with a chamber where the output interface125is located, and the control pressure enters a reverse control pressure chamber (i.e., the pressure relief port132) of the jointing pressure regulating valve130via the interfaces122and125. As the control pressure of the control pressure regulating valve110is applied in a smaller area, the jointing pressure regulating valve130outputs a jointing pressure with a smaller variation rate. When the output pressure of the control pressure regulating valve110is higher than the set valve of the spring127of the pressure switching valve120, the interface123and the interface125of the pressure switching valve120communicate with each other, and a pressure of the oil drainage chamber enters the reverse control pressure chamber (i.e., the pressure relief port132) of the jointing pressure regulating valve130via the interfaces123and125, so that the control pressure of the control pressure regulating valve110is applied in a larger area and the variation rate of the jointing pressure is increased.

InFIG. 9, a pressure control system includes an electronic control device (TCU)100and a control pressure regulating valve110, where the control pressure regulating valve110is generally an electromagnetic valve; a pressure switching valve120, a control interface121located in the pressure switching valve and connected to an oil passage of the control pressure, an input interface122located in the pressure switching valve and used for receiving a jointing pressure from a jointing pressure control valve, a pressure relief port123in the pressure switching valve, a spring chamber or an oil drainage pressure124in the pressure switching valve, an output interface125located in the pressure switching valve and connected to a feedback interface of a jointing pressure regulating valve, a valve core126in the pressure switching valve, and a spring127in the pressure switching valve; and a jointing pressure regulating valve130, a control interface131located in the jointing pressure regulating valve and used for receiving the control pressure, a pressure relief port132in the jointing pressure regulating valve, a pressure relief port133in the jointing pressure regulating valve, a system main pressure input port134in the jointing pressure regulating valve, a feedback interface135located in the jointing pressure regulating valve and connected to an output port of the pressure switching valve, a jointing pressure output interface136located in the jointing pressure regulating valve and connected to a piston chamber of a torque control device, a valve core137in the jointing pressure regulating valve, a spring138in the jointing pressure regulating valve, and a jointing pressure feedback interface and a spring chamber138ain the jointing pressure regulating valve130.

The electronic control device (TCU)100outputs a control signal to the control pressure regulating valve110, the control pressure regulating valve110outputs a pressure in proportion to the control signal, and the output pressure of the control pressure regulating valve110is applied to a control chamber (i.e., the control interface121) of the pressure switching valve120and the control interface131of the jointing pressure regulating valve130. When the output pressure of the control pressure regulating valve110is lower than a set value of the spring127of the pressure switching valve120, the chambers where the interfaces122and125of the pressure switching valve120are located communicate with each other, and a jointing pressure of the piston chamber enters a feedback chamber (i.e., a chamber to which the feedback interface135is connected) of the jointing pressure regulating valve130via the interfaces122and125. As the feedback area of the pressure of the jointing pressure regulating valve130is increased, the jointing pressure regulating130outputs a jointing pressure with a smaller slope and being in proportion to the control pressure of the control pressure regulating valve110. When the output pressure of the control pressure regulating valve110is higher than the set valve of the spring of the pressure switching valve120, the chambers to which the interfaces123and125of the pressure switching valve120are connected communicate with each other, and an oil drainage chamber enters the feedback interface135located in the jointing pressure regulating valve and connected to the output port of the pressure switching valve via the interfaces123and125, and the feedback interface135of the jointing pressure regulating valve130releases pressure, so that the feedback area of the jointing pressure regulating valve130is reduced, and the jointing pressure regulating valve130outputs a jointing pressure with a larger slope and being in proportion to the control pressure of the control pressure regulating valve110.

In Embodiments 6-7 described above, the relation between a control pressure and a jointing pressure is shown asFIG. 2. During the torque transmission devices are jointed, by a switching of the pressure switching valve, the apply area of the control pressure of the jointing pressure regulating valve is reduced or the feedback area is increased, it is advantageous for a precise control to the jointing pressure adopting a jointing pressure with a smaller variation slope and being in proportion to the control pressure of the control pressure regulating valve; Furthermore, after the torque transmission devices are jointed, that is, after there is no relative slip, by a switching of the pressure switching valve, the apply area of the control pressure of the jointing pressure regulating valve is increased or the feedback area is reduced, so that the variation slope of the jointing pressure is increased and an adequate torque capacity is ensured.