Vehicle control device

Abstract

In order to execute control with good precision while exploiting the advantages of sealed hydraulic control, this control device for a vehicle is equipped with a hydraulic chamber (15) that introducesoil pressure for operating a drive transmission element (10), a first pressure adjustment mechanism (35, 37) and a second pressure adjustment mechanism (43) for switching the oil pressure in the hydraulic chamber (15), and a control device (50), wherein the control device (50) is capable of switching between a first state in which the pressure in the hydraulic chamber is increased while the firstpressure adjustment mechanism (35, 37) is in an increased-pressure state and the second pressure adjustment mechanism (43) is in a holding state, and a second state in which the second pressure adjustment mechanism (43) is in a non-holding state and the pressure in the hydraulic chamber is reduced, and when the actual oil pressure exceeds a target oil pressure, performs a state-switching controlwherein the state is switched from the first state to the second state.

Description

technical field [0001] The present invention relates to a control device for a vehicle that controls clutch pressure in a vehicle including a hydraulically sealed clutch provided in a power transmission path. Background technique [0002] Conventionally, as one of electronically controlled four-wheel drive systems that switch between a two-wheel drive (2WD) state and a four-wheel drive (4WD) state, the following hydraulically sealed four-wheel drive system is known. In the system, a clutch for front and rear torque distribution is provided in the middle of the propeller shaft connecting the front differential mechanism and the rear differential mechanism, and hydraulic pressure (oil) for driving the clutch is supplied from an electric oil pump through a check valve, and The supplied hydraulic pressure is sealed by the electromagnetic valve, thereby maintaining the engaged state of the clutch (for example, refer to Patent Document 1). [0003] In addition, after a predetermi...

AI Technical Summary

Problems solved by technology

[0004] However, the distribution of torque transmitted to the front and rear wheels cannot be controlled with high precision only by the opening and closing control (enclosure control) of the solenoid valve.

This is because, when the electric oil pump is operated when the specified hydraulic pressure is changed in the enclosing control, an overshoot of the actual hydraulic pressure may occur, making it difficult to maintain the accuracy of the torque control.

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