| 摘要 |
PURPOSE:To make constant-speed driving maintainable so effectively, by letting a transmission step shift-down when engine load is more than the specified value and an engine speed is lowered as much as the specified extent from the setting one at starting of the constant-speed driving. CONSTITUTION:There are provided with an engine speed detecting device 1004 detecting an engine speed and a high engine load detecting device 1006 detecting a fact that engine load is more than the specified value, and these detecting signals are outputted to a controlling device 1008. With this controlling device 1008, a driving actuator 1002 of a throttle valve or the like controlling a fuel supply to an engine is controlled for keeping a car speed to the setting one. And at the above-mentioned, when the engine load is less than the specified value and the engine speed goes down as much as the specified extent from the setting on at starting of the constant-speed driving, a shift-down device 1000 is operated and a car transmission step is made so as to be shifted down.
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