Anti-creep control apparatus for automatic transmission
AssigneeNissan Motor Co., Ltd.
InventorsTakashi Murasugi, Motoharu Nishio, Hiromasa Sakai
Life of this patent
Estimating the term…
Abstract
An anti-creep control apparatus has a forward clutch control section that controls the hydraulic pressure of a forward clutch so as to slip the forward clutch when an automatic transmission is set in a drive range and the vehicle is stopped. The anti-creep control apparatus sets a target engagement time that is inversely proportional to the engine rotation speed at the time just before starting anti-creep control. The anti-creep control apparatus controls an oil pressure modulator so that one of a slip amount of the forward clutch and the output shaft rotation speed of the torque converter becomes nearly zero when the target engagement time elapses.
Claims9
An anti-creep control apparatus for an automatic transmission, which includes a torque converter connected to an engine and a friction element engageable during a drive range of the automatic transmission, said anti-creep control apparatus comprising:
- an engine output detecting means for detecting whether an engine throttle valve is opening from an idle position;
- an engine rotation speed detecting means for detecting a rotation speed of the engine;
- an output rotation speed detecting means for detecting a rotation speed of an output shaft of the torque converter;
- a target engagement time setting means for setting a target engagement time that is in inverse proportion to the engine rotation speed when said engine output detecting means detects that the engine throttle valve is opening from the idle position;
- and
- an engagement force control means for controlling an engagement force of the friction element so that either a slipping amount of the friction element or the output shaft rotation speed of the torque converter becomes nearly zero as said set target engagement time elapses.
An anti-creep control apparatus for an automatic transmission, which includes a torque converter connected to an engine and a friction element engageable during a drive range, said anti-creep control apparatus comprising:
- an engine output detecting means for detecting whether an engine throttle valve is opening from an idle position;
- an engine rotation speed detecting means for detecting a rotation speed of the engine;
- an output rotation speed detecting means for detecting a rotation speed of an output shaft of the torque converter;
- a target engagement time setting means for setting a target engagement time that is in inverse proportion to the engine rotation speed after when said engine output detecting means detects that the engine throttle valve is opening from the idle position;
- and
- an engagement force control means for controlling an engagement force of the friction element so that either a slipping amount of the friction element or the torque converter output shaft rotation speed becomes nearly zero as said set target engagement time elapses,
- wherein said engagement force control means includes a feedback control for changing the engagement force of the friction element based on the torque converter output shaft rotation speed and said set target engagement time.
An anti-creep control apparatus for an automatic transmission, comprising:
- a torque converter adapted to be connected to an engine;
- a forward clutch engageable during a drive range of the automatic transmission;
- an oil pressure modulator for adjusting hydraulic pressure supplied to said forward clutch;
- a sensor unit for detecting whether an engine throttle valve is opening from an idle position, an engine rotation speed, and an output shaft rotation speed of said torque converter;
- and
- a control unit for setting a target engagement time that is in inverse proportion to the engine rotation speed when said engine output detecting means detects that the engine throttle valve is opening from the idle position,
- wherein said control unit controls said oil pressure modulator so that either a slipping amount of said forward clutch or the torque converter output shaft rotation speed becomes nearly zero as said set target engagement time elapses.
Dependencies are inferred from the claim text.