FUEL INJECTION SYSTEM WITH CONTROLLED INJECTORS FOR DIESEL ENGINES

Abstract: A fuel injection system with controlled injectors for diesel engines includes a system for regulating the temperature of the fuel, including thermostatically-­ controlled preheating means (12, 13) associated with the fuel supply circuit (5a) and electronically-control­ led cooling means (17, 18, 20-24) associated with the fuel recycling circuit (8).

Description: The present invention relates in general to fuel injection systems with controlled injectors for diesel engines. More particularly, the invention concerns a fuel injection system with controlled injectors for diesel engines, comprising: a fuel tank; a supply circuit including a pump for conveying the fuel under pressure from the tank to the controlled injectors; a circuit for recycling the fuel to the tank, including a return line from the pump in which a pressure-regulating valve is inserted; and a system for regulating the temperature of the fuel, including: preheating means including a branch line which connects the return line from the pump, downstream of the pressure-regulating valve, with the supply circuit upstream of the pump, and a cutoff valve having a thermostatic control and being arranged to allow the fuel to flow through the branch line when the temperature of the fuel is below a predetermined threshold value and to stop this flow when the temperature exceeds the threshold value, and cooling means associated with the return line of the pump. A fuel injection system of this type is disclosed e.g. in FR-A-2 386 692. The object of the present invention is to provide an injection system of the type specified above, arranged to control and regulate the temperature of the fuel supplied to the injectors in order to ensure a more regular and correct operation. According to the invention, this object is achieved by a fuel injection system of the type defined above, characterized in that the pressure regulating valve is a solenoid valve; the recycling circuit further comprises a return line from the injectors joining the return line from the pump; the fuel flow through the branch line is controlled by the temperature of fuel in the supply circuit upstream of the pump; and the cooling means includes temperature sensing means in the fuel delivery line downstream of the pump and upstream of the pump return line, and the cooling means are electrically-controlled cooling means which are associated with the recycling circuit downstream of the point where the return line from the injectors joins the return line from the pump and are controlled by an electronic unit in response to signals provided by the temperature sensing means. By virtue of this solution, it is possible to keep the temperature of the fuel conveyed to the injectors substantially constant both in low-temperature environments and/or operative conditions and in high-temperature conditions. In the first case, the cold fuel from the tank is mixed upstream of the intake side of the pump with that heated as a result of lamination by the solenoid pressure-regulating valve, until the desired temperature is reached. In the second case, however, the fuel is cooled before its return to the tank. This cooling may be achieved with the use of an auxiliary heat exchanger and possibly an electric fan associated therewith, or simply by means of an electric fan associated directly with the return tubes for the fuel or with the tank itself. When the pump has means for reducing the fuel delivery, the cooling may also be achieved by intervention on the reduction means so as to reduce the lamination of the fuel by the solenoid regulating valve and the consequent increase in the temperature resulting from this lamination. The invention will now be described in detail with reference to the appended drawing, provided purely by way of non-limiting example, showing a fuel injection system according to the invention in schematic form. With reference to the drawing, a pumping unit of a fuel injection system for diesel engines is schematically and generally indicated 1 and is provided with a unit with controlled injectors, schematically indicated 2. These injectors are normally of the electrically-operated type and are controlled in known manner by an electronic unit 3. The pumping unit 1 includes a pump 4, normally of the reciprocating in-line or radial type, conveniently provided with devices, not illustrated, for reducing the fuel flow, associated with the intake and/or the delivery. The pump 4 is connected in a circuit 5 for supplying the fuel from a tank 6 to the injectors 2, including an inlet line 5a connected to the intake side of the pump 4 and in which a filter 7 is inserted, and a delivery line 5b connecting the delivery side of the pump 4 to the injectors 2. A circuit for recycling the fuel from the injectors 2 to the tank 6 is generally indicated 8. This recycling circuit 8 includes a return line 9 from the pump 4, which is connected to the delivery line 5b and in which is inserted a pressure-regulating valve 10 with an electrical control 11 piloted by the electronic control unit 3. The solenoid valve 10, 11 may for example be of the type forming the subject of Italian Utility Model Application No. 54052-B/86 in the name of the same Applicants. The return line 9 from the pump 4 is connected to the inlet line 5a by means of a branch line 12 in which is connected a cutoff valve 13 with a thermostatic control 14 sensitive to the temperature of the fuel in the line 5a upstream of the intake side of the pump 4. The thermostatic control 14 controls the cut-off valve 13 so as to enable the fuel to flow through the branch line 12 when the temperature of the fuel upstream of the pump 4 is below a predetermined threshold value and to stop this flow when the temperature of the fuel upstream of the pump 4 exceeds this threshold value. The recycling circuit 8 also includes a return line 15 from the injectors 2 to the tank 6, which is joined at 16 by the return line 9 from the pump 4 downstream of the branch line 12. Downstream of the junction 16, the return line 15 from the injectors 2 has associated fuel cooling means. In the embodiment illustrated, these means comprise a fan 17 with an electrical control 18 piloted by the electronic control unit 3 and arranged to generate a cooling air-flow directly towards a portion 19 of the return line 15. This portion 19 may conveniently be coiled. In addition or alternatively, the cooling means may include a heat exchanger 20 inserted in a branch passage 21 of the line 15. In this case, the passage of the fuel through the line 19 or through the line 21 is controlled by means of a valve 22 with an electrical control 23 controlled by the electronic unit 3. Moreover, in this case, the electric fan 17, 18 may be operatively associated with the heat exchanger 20. In addition, a cooling means for the fuel may be constituted by the delivery reducing devices themselves associated with the pump 4 and piloted electrically by the electronic control unit 3. In each case, the piloting by the unit 3 is effected in response to electrical temperature signals from a sensor 24 arranged to detect the temperature of the fuel in the delivery line 5b upstream of the return line 9 from the pump 4, and to supply corresponding electrical signals to the unit 3. In operation, the system according to the invention is able to direct the fuel to the injectors 2 at a regulated temperature. In the case of low-temperature climatic and/or operative conditions, the regulation is effected by the thermostatic valve 14 by means of which the fuel laminated and thus heated by the solenoid regulating valve 10, 11 is mixed upstream of the intake side of the pump 4 with that coming from the inlet line 5a of the supply circuit 5. The preheating action is stopped when the valve 13 is closed by the thermostatic actuator 14 as the predetermined threshold level is reached. In high temperature conditions, however, the fuel is cooled in the recycling circuit 8 by the activation of the electric fan 17, 18 and/or the connection of the heat exchanger 20 operated by means of the control of the solenoid valve 22, 23, and through the operation of the delivery reducing devices associated with the pump 4. As stated above, the cooling action is piloted by the electronic unit 3 in dependence on the temperature of the fuel downstream of the delivery from the pump 4 detected by the sensor 24.

Claims: A fuel injection system with controlled injectors for diesel engines, comprising: a fuel tank (6); a supply circuit (5, 5a, 5b) including a pump (4) for conveying the fuel under pressure from the tank to the controlled injectors (2); a circuit (8) for recycling the fuel to the tank, including a return line (9) from the pump in which a pressure-regulating valve (10, 11) is inserted; and a system for regulating the temperature of the fuel, including: preheating means including a branch line (12) which connects the return line (9) from the pump (4), downstream of the pressure-regulating valve (10, 11), with the supply circuit (5a) upstream of the pump (4), and a cutoff valve (13) having a thermostatic control (14) and being arranged to allow the fuel to flow through the branch line (12) when the temperature of the fuel is below a predetermined threshold value and to stop this flow when the temperature exceeds the threshold value, and cooling means (17, 18; 20-24) associated with the return line from the pump (4), characterized in that the pressure regulating valve (10, 11) is a solenoid valve; the recycling circuit (8) further comprises a return line (15) from the injectors (2) joining the return line (9) from the pump (4); the fuel flow through the branch line (12) is controlled by the temperature of fuel in the supply circuit (5a) upstream of the pump (4); and the cooling means includes temperature sensing means (24) in the fuel delivery line (5b) downstream of the pump (4) and upstream of the pump return line (9) and the cooling means are electrically-controlled cooling means (17, 18; 20-23) which are associated with the recycling circuit (8) downstream of the point where the return line (15) from the injectors (15) joins the return line (9) from the pump (4) and are controlled by an electronic unit (3) in response to signals provided by the temperature sensing means (24). A system according to claim 1, characterized in that the cooling means include an electric fan (17, 18) associated with the recycling circuit (8) downstream of the point where the return line (15) from the injectors (2) joins the return line (9) from the pump (4). A system according to claim 1 or 2, characterized in that the cooling means include a heat exchanger (20) and solenoid valve means (22, 23) for opening or closing the passage of the fuel through the heat exchanger (20), the heat exchanger (20) and the solenoid valve means (22, 23) being arranged in the recycling circuit (8) downstream of the point where the return line (15) from the injectors (2) joins the return line (9) from the pump (4). A system according to any one of the preceding claims, in which the pump (4) has means for reducing the fuel delivery, characterized in that the cooling means include electrical means (3) for controlling the delivery reducing means.

Inventors: AUSIELLO, FRANCESCO PAOLO, DE MATTHAEIS, SISTO LUIGI, RICCO, MARIO
Applicants: WEBER S.R.L.
Application year: 1988
Main classification: F02M53
IPC codes: F02B3, F02M31, F02M53, F02M55