Control apparatus and control method of automatic transmission for vehicle
AssigneeHitachi Unisia Automotive, Ltd.
InventorMasanobu Horiguchi
Life of this patent
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Abstract
Grade resistance Ri is calculated based on a driving force, an acceleration degree and rolling/air resistance. When a brake switch is OFF, a down-slope is judged using the grade resistance Ri directly as a value Rif for down-slope judgment. On the contrary, when braking is performed where the brake switch is ON, a minimum value of the grade resistance Ri is peak held, to set the peak held value as the value Rif for down-slope judgment.
Claims15
A control apparatus of an automatic transmission for a vehicle, comprising:
- said automatic transmission;
- an operating condition detector detecting operating conditions of said vehicle;
- and
- a control unit receiving a detection signal from said operating condition detector, and controlling a gear change of said automatic transmission based on said detection signal,
- wherein said control unit:
- is constituted to calculate grade resistance of a running road surface based on the operating conditions of the vehicle, to set a shift point based on said grade resistance;
- and
- holds a minimum value of said calculated grade resistance when vehicle braking is performed, to set said shift point based on said held minimum value.
A control apparatus of an automatic transmission for a vehicle, comprising:
- operating condition detecting means for detecting operating conditions of said vehicle;
- grade resistance calculating means for calculating grade resistance of a running road surface based on said operating conditions;
- braking judgment means for judging whether or not vehicle braking is performed;
- and
- shift point setting means for setting a shift point based on the newest value of said grade resistance when vehicle braking is not performed, while holding a minimum value of said grade resistance to set the shift point based on said held minimum value when vehicle braking is performed.
A control method of an automatic transmission for a vehicle, for setting a shift point based on grade resistance of a running road surface, comprising the steps of:
- detecting operating conditions of said vehicle;
- calculating the grade resistance of the running road surface based on the operating conditions of the vehicle;
- judging whether or not vehicle braking is performed;
- setting the shift point based on the newest value of said grade resistance when vehicle braking is not performed;
- and
- holding a minimum value of said calculated grade resistance to set the shift point based on said held minimum value when vehicle braking is performed.
Dependencies are inferred from the claim text.