| 摘要 |
A constant speed drive control unit, comprising a device for driving a throttle valve for a car provided with a fuel injection controller for cutting a fuel supply to an engine when the throttle valve comes to a first predetermined opening (0%) or below, and an automatic transmission controller for setting a speed stage of a speed change mechanism, an opening detector for detecting a throttle valve opening, a speed detector for detecting a car running speed, a speed controller for energizing the device for driving the throttle valve to coordinate the running speed with a desired car speed, and generating a shift-down assignment signal when the running speed exceeds the desired speed to the throttle valve coming to a second predetermined opening (5%) or below, and a speed change controller for changing the speed stage of the speed change mechanism to a lower stage in response to the signal. When the car comes to run on a descent while running on a high speed stage, the running speed becmes higher than the desired speed, thus the speed controller contracting the throttle opening. When the throttle valve comes to the second predetermined opening (5%), the speed controller generates the shift-down assignment signal, and the speed change controller shifts the speed change mechanism down to a lower speed stage in response to the signal.
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