| 摘要 |
A system for controlling an engine of a vehicle can include: an engine, a transmission, a coupling, and a controller. The controller can be configured to adjust a speed of the engine output shaft based on a comparison of a shaft speed of the input shaft with a shaft speed limit when an operator of the vehicle changes from a first one of the plurality of speed ratios to a second one of the plurality of speed ratios. This control can occur during a downshift, for example, when the second one of the plurality of speed ratios is numerically greater than the first one of the speed ratios. Thus, the controller can be configured to protect the engine and the vehicle from shift shock when a sensor in the control system for the transmission has failed. Also, a method for controlling an engine of a vehicle during a downshift in a transmission driven by the engine can include comparing a current speed of an input shaft of the transmission to a shaft speed limit when a change from a first one of a plurality of speed ratios of the transmission to a second one of a plurality of speed ratios of the transmission occurs, where the first one of the plurality of speed ratios is numerically less than the second one of the plurality of speed ratios. |
