초록 ▼

An engine and a motor are connected to the drive wheels of a vehicle via an automatic transmission. The drive wheels are driven using one of or both of the motor and the engine depending on the running state. The automatic transmission varies the drive ratio by the discharge pressure of the oil pres

An engine and a motor are connected to the drive wheels of a vehicle via an automatic transmission. The drive wheels are driven using one of or both of the motor and the engine depending on the running state. The automatic transmission varies the drive ratio by the discharge pressure of the oil pressure pump. The oil pressure pump is driven by a second motor. When the automatic transmission is varying the drive ratio, the discharge of the oil pressure pump is increased by increasing the rotational speed of the second motor and thus the required oil for varying the drive ratio is maintained.

대표청구항 ▼

[ What is claimed is:] [1.]1. An oil pressure supply device for a vehicle drive system wherein an engine and a first motor are connected to a drive shaft via an automatic transmission, said transmission comprising an input shaft and varying a drive ratio depending on an oil pressure, said oil pressu

[ What is claimed is:] [1.]1. An oil pressure supply device for a vehicle drive system wherein an engine and a first motor are connected to a drive shaft via an automatic transmission, said transmission comprising an input shaft and varying a drive ratio depending on an oil pressure, said oil pressure supply device comprising:an oil pump,a second motor connected to said oil pump,an electrical circuit for regulating a rotation speed of said second motor, said oil pump varying a discharge according to the rotation speed of said second motor,a first sensor for detecting an operating state of said automatic transmission,a second sensor which detects a rotation speed of said input shaft, anda microprocessor programmed to:determine from said operating state whether or not said automatic transmission is varying the drive ratio, andcontrol said electrical circuit so that the rotation speed of said second motor is higher when said automatic transmission is varying the drive ratio, than when said automatic transmission is not varying the drive ratio, and that the rotation speed of said second motor increases as the rotation speed of said input shaft decreases, when said automatic transmission is not varying the drive ratio.