Automatic transmission shifting performance evaluation
First Claim
1. A method, performed by a test control system, of evaluating shift performance of an automatic transmission system having gears, and a torque converter, the method comprising:
- driving the automatic transmission with an input motor at an input speed while applying a rotational load by a pair of output motors;
applying a command to a solenoid to change fluid pressure and detecting a time when the solenoid command is sent to the solenoid;
shifting between a pair of the gears;
measuring transmission output torque and obtaining torque values;
determining a threshold value for a torque converter rotation speed;
determining a threshold value for the transmission output torque;
determining a lag time between a threshold for a turbine speed and the detected time for the solenoid;
determining an engage time based on the torque threshold value and the turbine speed threshold; and
judging the performance of the pair of gears based on the lag time, engage time and a peak of the transmission output torque.
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Accused Products
Abstract
A method and system of evaluating shift performance of an automatic transmission system having gears and a torque converter. The method includes driving the automatic transmission with an input motor while applying a rotational load by a pair of output motors. A command is applied to a solenoid to change fluid pressure, the time of issuance of the command is recorded, and the transmission shifts between a pair of the gears. Periodic measurements are made for transmission output torque. Threshold values are determined for the torque converter rotation speed and for the transmission output torque. A lag time is determined between the threshold for the turbine speed and the detected time for the solenoid. An engage time is determined based on the torque threshold and the turbine speed threshold. Lag time, peak transmission, and output torque are used to judge performance of the automatic transmission system.
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Citations
20 Claims
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1. A method, performed by a test control system, of evaluating shift performance of an automatic transmission system having gears, and a torque converter, the method comprising:
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driving the automatic transmission with an input motor at an input speed while applying a rotational load by a pair of output motors; applying a command to a solenoid to change fluid pressure and detecting a time when the solenoid command is sent to the solenoid; shifting between a pair of the gears; measuring transmission output torque and obtaining torque values; determining a threshold value for a torque converter rotation speed; determining a threshold value for the transmission output torque; determining a lag time between a threshold for a turbine speed and the detected time for the solenoid; determining an engage time based on the torque threshold value and the turbine speed threshold; and judging the performance of the pair of gears based on the lag time, engage time and a peak of the transmission output torque. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A non-transitory computer-readable storage medium storing instructions, which when executed by a computer in a test control system perform a method of evaluating shift performance of an automatic transmission system having gears, and a torque converter, the method comprising:
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driving the automatic transmission with an input motor at an input speed while applying a rotational load by a pair of output motors; applying a command to a solenoid to change fluid pressure and detecting a time when the solenoid command is sent to the solenoid; shifting between a pair of the gears; measuring transmission output torque and obtaining torque values; determining a threshold value for a torque converter rotation speed; determining a threshold value for the transmission output torque; determining a lag time between a threshold for a turbine speed and the detected time for the solenoid; determining an engage time based on the torque threshold value and the turbine speed threshold; and judging the performance of the pair of gears based on the lag time, engage time and a peak of the transmission output torque. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A test control system that evaluates shift performance of an automatic transmission system having gears, and a torque converter, the system comprising:
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an input motor driving the automatic transmission at an input speed while applying a rotational load by a pair of output motors; a measurement circuit configured to apply a command to a solenoid to change fluid pressure and detect a time when the solenoid command is sent to the solenoid; the automatic transmission being shifted between a pair of the gears; a torque meter measuring transmission output torque and outputting torque values; a controller detecting a threshold value for a torque converter rotation speed; detecting, by the controller, a threshold value for the transmission output torque; detecting, by the controller, a lag time between a threshold for a turbine speed and the detected time for the solenoid; determining, by the controller, an engage time based on the torque threshold value and the turbine speed threshold; and judging, by the controller, the performance of the pair of gears based on the lag time, engage time and a peak of the transmission output torque. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification