| 摘要 |
PURPOSE:To prevent a step motor from getting out of order, by changing speed level of the step motor, for fixing opening of a throttle valve according to the relation between water temperature for cooling an engine and the maximum value of speed level. CONSTITUTION:An aimed stepping position of a step motor to fix opening of a throttle valve is calculated and stored into random memory (RAM) at a step 102. Output voltage of a water temperature sensor is A/D converted at a step 103. The maximum value of speed level is calculated from the A/D conversion value of the water temperature sensor, and is stored into the RAM at a step 104. Operation speed of the throttle valve declines with rise of water temperature for the throttle valve declines with rise of water temperature for cooling an engine. In this way, over heating of the engine is recognized, and a step motor can be prevented from getting out of order.
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