Patent ID: 9140312
Filing Date: 2015-09-22
Classification: B60K,B60W,F16D,F16H,Y02T

Abstract:
1. A hydraulic control device for a hybrid drive device, comprising: a source pressure generation section that generates a source pressure; a hydraulic servo for a clutch provided on a power transfer path between an engine and a motor provided on a drive wheel side with respect to the engine; a control solenoid valve that is a normally closed linear solenoid valve that includes an input port to which the source pressure is supplied from the source pressure generation section, an output port that is electrically controlled so as to output the regulated source pressure to the hydraulic servo for the clutch as an engagement pressure, and a drain port that discharges hydraulic pressure from the hydraulic servo of the clutch, and that blocks communication between the input port and the output port and allows communication between the drain port and the output port when de-energized; a switching section that switches a hydraulic passage, which extends between the source pressure generation section and the hydraulic servo to supply the engagement pressure, between a first state and a second state in which the hydraulic passage has a high conduit resistance compared to that in the first state at least until the clutch is engaged, wherein the switching section switches the hydraulic passage into the second state during a failure in which the control solenoid valve is de-energized and the source pressure is directly supplied to the hydraulic servo as the engagement pressure, and switches the hydraulic passage into the first state during normal times when the failure does not occur, and, in the second state, the source pressure input to the drain port of the control solenoid valve is output from the output port to the hydraulic servo as a failure time engagement pressure; a normally open solenoid valve that makes an output when de-energized, wherein switching between the first state and the second state is performed by a signal pressure from the normally Open solenoid valve; and an orifice that is disposed at a position at which an engagement operation and a disengagement operation of the clutch is not affected during the normal times.