Controller of automatic transmission having a lockup clutch and control method of the automatic transmission
First Claim
1. A control device for an automatic transmission having a lockup clutch, the control device comprising:
- slip quantity calculating means for calculating a slip quantity between an input shaft and an output shaft of a torque converter;
engaging force regulating means for regulating an engaging force of the lockup clutch disposed with the torque converter in parallel, so that slip control of the lockup clutch for controlling the slip quantity to a predetermined target slip quantity is carried out; and
detecting means for detecting a start of an inertia phase during a speed change of the automatic transmission;
wherein when the start of the inertia phase is detected by the detecting means, a target engine rotational speed is calculated according to one of an engine rotational speed when the inertia phase starts and a value based on the engine rotational speed when the inertia phase starts, anda target engine rotational speed control is carried out so that the engine rotational speed is controlled to come close to the target engine rotational speed.
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Accused Products
Abstract
A controller of an automatic transmission having a lockup clutch and a control method of the automatic transmission, in which engine rotational speed is prevented from changing even though turbine rotational speed changes at gear shift and slip control can be carried out without making a driver feel uncomfortable are provided. When a speed change command is detected and it is determined that an inertia phase has not yet started, target engine rotational speed during a replenish period is calculated and the target engine rotational speed control is carried out to have the target engine rotational speed. When it is determined that the control is in the inertia phase, another target engine rotational speed during the inertia phase is calculated. Then, target engine rotational speed control in which the engine rotational speed at the start of the inertia phase is maintained as the target engine rotational speed is carried out.
52 Citations
12 Claims
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1. A control device for an automatic transmission having a lockup clutch, the control device comprising:
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slip quantity calculating means for calculating a slip quantity between an input shaft and an output shaft of a torque converter; engaging force regulating means for regulating an engaging force of the lockup clutch disposed with the torque converter in parallel, so that slip control of the lockup clutch for controlling the slip quantity to a predetermined target slip quantity is carried out; and detecting means for detecting a start of an inertia phase during a speed change of the automatic transmission; wherein when the start of the inertia phase is detected by the detecting means, a target engine rotational speed is calculated according to one of an engine rotational speed when the inertia phase starts and a value based on the engine rotational speed when the inertia phase starts, and a target engine rotational speed control is carried out so that the engine rotational speed is controlled to come close to the target engine rotational speed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A control method of an automatic transmission having a lockup clutch, said method comprising:
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regulating engaging force of the lockup clutch disposed with a torque converter in parallel; and controlling slip quantity between an input shaft and an output shaft of the torque converter to a predetermined target slip quantity, wherein; when a start of an inertia phase is detected during a speed change of the automatic transmission, a target engine rotational speed is calculated according to one of an engine rotational speed when the inertia phase starts and a value based on the engine rotational speed when the inertia phase starts; and a target engine rotational speed control for controlling engine rotational speed to come close to the target engine rotational speed.
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Specification