System and method of controlling automatic transmission
AssigneeJATCO Ltd
InventorsYoshiaki Katou, Yasushi Yabe
Life of this patent
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Abstract
A system for controlling an automatic transmission includes a start clutch, an engagement element arranged in series to the start clutch and engaged during vehicle driving, and an ECU for controlling the start clutch and the engagement element, wherein the ECU is programmed to select, at vehicle start, one of the start clutch and the engagement element in accordance with one of the oil temperature within the transmission and the throttle-valve opening.
Claims14
A system for controlling an automatic transmission, comprising:
- a start clutch;
- an engagement element arranged in series to the start clutch, the engagement element being engaged during vehicle driving;
- and
- an electronic control unit (ECU) which controls the start clutch and the engagement element, the ECU being programmed to select, at vehicle start, one of the start clutch and the engagement element in accordance with one of an oil temperature within the transmission and a throttle-valve opening,
- wherein the ECU is further programmed to:
- determine whether or not the oil temperature is smaller than a predetermined value;
- set, when it is determined that the oil temperature is smaller than the predetermined value, a driver's selected shift range is a drive range, and an accelerator fails to be depressed, an engagement torque capacity of the engagement element at a first value required for creep;
- and
- set, when it is determined that the oil temperature is smaller than the predetermined value, the driver's selected shift range is the drive range, and the accelerator is depressed, at least the engagement torque capacity of the engagement element at a second value greater than an input torque.
A system for controlling an automatic transmission for a vehicle, the system comprising:
- a start clutch having an engaged state allowing the vehicle to start;
- an engagement element arranged in series to the start clutch, the engagement element being engaged during vehicle driving;
- means for controlling the start clutch and the engagement element, the controlling means controlling selectively one of the start clutch and the engagement element for allowing the vehicle to start in accordance with one of an oil temperature within the transmission and a throttle-valve opening;
- means for determining whether or not the oil temperature is smaller than a predetermined value;
- means for setting, when it is determined that the oil temperature is smaller than the predetermined value, a driver's selected shift range is a drive range, and an accelerator fails to be depressed, an engagement torque capacity of the engagement element at a first value required for creep;
- and
- means for setting, when it is determined that the oil temperature is smaller than the predetermined value, the driver's selected shift range is the drive range, and the accelerator is depressed, at least the engagement torque capacity of the engagement element at a second value greater than an input torque.
A method of controlling an automatic transmission with a start clutch and an engagement element arranged in series to the start clutch and engaged during vehicle driving, the method comprising:
- selecting, at vehicle start, one of the start clutch and the engagement element in accordance with one of an oil temperature within the transmission and a throttle-valve opening;
- determining whether or not the oil temperature is smaller than a predetermined value;
- setting, when it is determined that the oil temperature is smaller than the predetermined value, a driver's selected shift range is a drive range, and an accelerator fails to be depressed, an engagement torque capacity of the engagement element at a first value required for creep;
- and
- setting, when it is determined that the oil temperature is smaller than the predetermined value, the driver's selected shift range is the drive range, and the accelerator is depressed, at least the engagement torque capacity of the engagement element at a second value greater than an input torque.
Dependencies are inferred from the claim text.