Automatic transmission control method, control device, and automatic transmission system
First Claim
1. A control method for an automatic transmission including a plurality of friction elements that change a power transmission route of a transmission mechanism according to an operation state, a starting gear shift stage being attained by fastening a predetermined brake element and a predetermined clutch element among the friction elements, with automatic transmission not being provided with a one-way clutch,the control method comprising:
- a command detecting step of detecting a command for, from a state in which the clutch element and the brake element are released and in which transmission of power is not performed between an engine side and a wheel side of the transmission mechanism, fastening the friction elements to attain the starting gear shift stage;
a clutch element fastening step of supplying, when the command is detected in the command detecting step, hydraulic pressure to the clutch elements thereby fastening the clutch elements; and
a rotation control step of supplying, after the clutch element fastening step, the hydraulic pressure to the brake elements thereby starting the fastening of the brake elements and controlling rotation which is input to the transmission mechanism via the clutch elements.
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Accused Products
Abstract
A control method for an automatic transmission in which a starting gear shift stage is attained by fastening a predetermined brake element and a predetermined clutch element includes a step of supplying, when a command, which is for fastening the predetermined brake element and the predetermined clutch element that is to be fastened to input output rotation on an engine side to a transmission mechanism, and which is also for attaining the starting gear shift stage is detected, hydraulic pressure to the clutch element and then fastening the clutch element, and a step of supplying, after the step, the hydraulic pressure to the brake element to start the fastening of the brake element and controlling rotation, which is input to the transmission mechanism, to a target number of rotations. It is possible to satisfactorily attain the starting gear shift stage without a shock while dispensing with a one-way clutch.
22 Citations
17 Claims
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1. A control method for an automatic transmission including a plurality of friction elements that change a power transmission route of a transmission mechanism according to an operation state, a starting gear shift stage being attained by fastening a predetermined brake element and a predetermined clutch element among the friction elements, with automatic transmission not being provided with a one-way clutch,
the control method comprising: -
a command detecting step of detecting a command for, from a state in which the clutch element and the brake element are released and in which transmission of power is not performed between an engine side and a wheel side of the transmission mechanism, fastening the friction elements to attain the starting gear shift stage; a clutch element fastening step of supplying, when the command is detected in the command detecting step, hydraulic pressure to the clutch elements thereby fastening the clutch elements; and a rotation control step of supplying, after the clutch element fastening step, the hydraulic pressure to the brake elements thereby starting the fastening of the brake elements and controlling rotation which is input to the transmission mechanism via the clutch elements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A control device for an automatic transmission including a plurality of friction elements that change a power transmission route of a transmission mechanism according to an operation state, a starting gear shift stage being attained by fastening a predetermined brake element and a predetermined clutch element among the friction elements, with automatic transmission not being provided with a one-way clutch,
the control device comprising: -
a command detecting unit for detecting a command for, from a state in which the clutch element and the brake element are released and in which transmission of power is not performed between an engine side and a wheel side of the transmission mechanism, fastening the friction elements to attain the starting gear shift stage; a clutch element fastening unit for supplying, when the command is detected by the command detecting unit, hydraulic pressure to the clutch elements thereby fastening the clutch elements; and a rotation control unit for supplying, after the operation of the clutch element fastening unit, the hydraulic pressure to the brake elements thereby starting the fastening of the brake elements and controlling rotation which is input to the transmission mechanism via the clutch elements.
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17. A control device for an automatic transmission including a plurality of friction elements that change a power transmission route of a transmission mechanism according to an operation state, a starting gear shift stage being attained by fastening a predetermined brake element and a predetermined clutch element among the friction elements, with automatic transmission not being provided with a one-way clutch,
the control device comprising: -
a command detecting unit for detecting a command for, from a state in which the clutch element and the brake element are released and in which transmission of power is not performed between an engine side and a wheel side of the transmission mechanism, fastening the friction elements to attain the starting gear shift stage; a clutch element fastening unit for supplying, when the command is detected by the command detecting unit, hydraulic pressure to the clutch elements thereby fastening the clutch elements; and a brake element fastening unit for supplying, after the operation of the clutch element fastening unit, the hydraulic pressure to the brake elements thereby starting the fastening of the brake elements.
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Specification