Vehicle control apparatus
AssigneeAisin Aw Co., Ltd.
InventorsYukinori Nakamori, Takehiko Suzuki, Satoru Wakuta, Takeshi Inuzuka
Life of this patent
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Abstract
A vehicle control apparatus including an engine, an automatic transmission, a hydraulic servo, a mechanical oil pump, an electric oil pump and a controller that controls driving of the electric oil pump and generates a standby pressure supplied to the hydraulic servo based upon a driving state of the mechanical oil pump, wherein the standby pressure is set less than a line pressure generated based upon driving the mechanical oil pump during idling and equal to or greater than an engagement starting pressure by which the friction engagement element starts transmitting a torque.
Claims28
A vehicle control apparatus, comprising:
- an engine that outputs a driving force;
- an automatic transmission having a friction engagement element freely engaging power transmission between said engine and a driven wheel;
- a hydraulic servo that controls an engagement state of said friction engagement element based upon a supplied oil pressure;
- a mechanical oil pump interlocking and driving with said engine and supplying the oil pressure to said hydraulic servo;
- an electric oil pump supplying the oil pressure to said hydraulic servo;
- and
- a controller that controls driving of said electric oil pump and generates a standby pressure supplied to said hydraulic servo based upon a driving state of said mechanical oil pump, wherein said standby pressure is set less than a line pressure generated based upon driving said mechanical oil pump during idling and equal to or greater than an engagement starting pressure by which said friction engagement element starts transmitting a torque.
A vehicle control apparatus, comprising:
- an engine that outputs a driving force;
- an automatic transmission having a friction engagement element freely engaging power transmission between said engine and a driven wheel based upon a pressing state of a friction plate;
- a hydraulic servo having a piston pressing said friction plate based upon a supplied oil pressure and controlling an engagement state of said friction engagement element in accordance with the pressing of said piston;
- a mechanical oil pump interlocking and driving with said engine and supplying the oil pressure to said hydraulic servo;
- an electric oil pump supplying the oil pressure to said hydraulic servo;
- and
- a controller that controls driving of said electric oil pump and generates a standby pressure supplied to said hydraulic servo based upon a driving state of said mechanical oil pump, wherein said standby pressure is set less than a line pressure generated based upon driving said mechanical oil pump during idling and equal to or greater than a stroke end pressure for bringing said piston and said friction plate into mutual contact without a gap.
A method of operating a vehicle with an engine that outputs a driving force, an automatic transmission having a friction engagement element freely engaging power transmission between said engine and a driven wheel, a hydraulic servo that controls an engagement state of said friction engagement element based upon a supplied oil pressure, a mechanical oil pump interlocking and driving with said engine and supplying the oil pressure to said hydraulic servo and an electric oil pump supplying the oil pressure to said hydraulic servo, comprising:
- driving said electric oil pump in order to generate a standby pressure which is supplied to said hydraulic servo based upon a driving state of said mechanical oil pump, wherein said standby pressure is set less than a line pressure generated based upon driving said mechanical oil pump during idling and equal to or greater than an engagement starting pressure by which said friction engagement element starts transmitting a torque.
A method of operating a vehicle with an engine that outputs a driving force, an automatic transmission having a friction engagement element freely engaging power transmission between said engine and a driven wheel based upon a pressing state of a friction plate, a hydraulic servo having a piston pressing said friction plate based upon a supplied oil pressure and controlling an engagement state of said friction engagement element in accordance with the pressing of said piston, a mechanical oil pump interlocking and driving with said engine and supplying the oil pressure to said hydraulic servo and an electric oil pump supplying the oil pressure to said hydraulic servo, comprising
- driving said electric oil pump in order to generate a standby pressure which is supplied to said hydraulic servo based upon a driving state of said mechanical oil pump, wherein said standby pressure is set less than a line pressure generated based upon driving said mechanical oil pump during idling and equal to or greater than a stroke end pressure for bringing said piston and said friction plate into mutual contact without a gap.
Dependencies are inferred from the claim text.