发明名称 |
Failsafe control system for automatic transmission |
摘要 |
A control system for control of a clutch interposed between a fluid transmission unit and a speed change unit in a vehicular automatic transmission. The control system includes a first R.P.M. detector for detecting clutch input side R.P.M. and a second R.P.M. detector for detecting clutch output side R.P.M. A stop state detector determines if the vehicle is at a standstill and a starting operation detector detects a starting operation by the driver. The hydraulic control unit includes a hydraulic servo for applying/releasing the input clutch, a control signal oil pressure generating solenoid valve for generating a control signal oil pressure, a control valve for regulating a forward running range pressure according to the control signal oil pressure to generate a control oil pressure; a change signal oil pressure generating solenoid valve for generating a change signal oil pressure and a change-over valve switchable by the change signal oil pressure, between a first position in which it feeds the forward running range pressure to the hydraulic servo, and a second position in which it feeds the control oil pressure to the hydraulic servo. A failure is decided if the clutch input/output R.P.M. difference is over a set value which is set on the basis of the clutch input/output R.P.M. difference when the starting operation is detected by the starting operation detector. A fail-safe feature causes a shift output to a higher speed gear stage, over-riding a control signal from the pressure booster, when a failure is decided, to output the change signal to the solenoid of the control signal oil pressure solenoid valve to thereby bring the change-over valve into the first position.
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申请公布号 |
US5649880(A) |
申请公布日期 |
1997.07.22 |
申请号 |
US19950580105 |
申请日期 |
1995.12.22 |
申请人 |
AISIN AW CO., LTD. |
发明人 |
TSUTSUI, HIROSHI;TSUKAMOTO, KAZUMASA;HAYABUCHI, MASAHIRO;NISHIDA, MASAAKI;YAMAMOTO, YOSHIHISA |
分类号 |
B60W10/06;B60W10/10;B60W50/02;F16H59/42;F16H59/44;F16H59/46;F16H59/50;F16H59/68;F16H61/04;F16H61/08;F16H61/10;F16H61/12;F16H61/20;F16H63/50;(IPC1-7):F16H61/20;F16H59/30;B60K41/02 |
主分类号 |
B60W10/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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