Device for the regulation of the starting operation of a motor vehicle on a mountain road

摘要

PURPOSE:To make it possible to detect the uphill road accurately by comparing the detected result of the car body speed in a specific period at the initial vihicle starting and a present value, and deciding to be an uphill road when the detected result is less than the threshold value. CONSTITUTION:When the accelerator pedal 18 is depressed, the car body speed is computed to be the average of the rotation speeds of the right side and the left side wheels, in a control unit 60 to which output signals of the left side and the right side front wheel speed sensors 66 and 68, and a rear wheel speed sensor 70 are input, and, the rotation speed and rotation accelerating speed of the rear wheels, which are the driving wheels, are also computed. And when the rear wheels are decided to be in an acceleration slip condition, a direction control valve 56 and a flow control valve 58 are controlled to operate rear wheel brakes 38 and 40 to suppress the rotation of the rear wheels. In such a starting control condition, the car body speed and a set value are compared, and when the car body speed is less than the set value, the running road is decided to be an uphill road, and after that, the rear wheel brakes 38 and 40 are controlled by using uphill pressure switching mode table.