| 摘要 |
A control system for automatically selecting a two wheel drive mode or a four wheel drive mode has a rainfall sensor for measuring the amount of precipitation such as rain, an acceleration sensor for measuring acceleration or deceleration of the vehicle, a control unit connected with the sensors for generating a 2WD or 4WD command signal, and an actuator for changing the drive system of the vehicle between the two wheel drive mode and four wheel drive mode in response to the command signal of the control unit. The control unit such as a microcomputer determines a reference acceleration and a reference deceleration each of which is a function of the rainfall measured by the rainfall sensor, and generates the 2WD command signal if the actual acceleration or deceleration is smaller than the reference acceleration or deceleration, and the 4WD command signal if the actual acceleration or deceleration is greater than the reference acceleration or deceleration.
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