| 摘要 |
PURPOSE: A pressure intensifying control method reduces braking distance and improves steering stability during braking by determining the amount of intensified pressure for one time. CONSTITUTION: A method comprises a frictional coefficient inference step, a pressure intensifying time calculation step and a braking pressure maintaining time calculation step. The frictional coefficient inference step is to get the current car body acceleration(AV), get the absolute value of the current car body acceleration(/AV/), get the acceleration difference value(DA') which is the difference of the absolute value of the car body acceleration(AV), calculate a first friction coefficient(μ0) by filtering The acceleration difference value(DA') by a low pass filter with cut off frequencies different depending on whether the acceleration difference value(DA') is positive or negative and then to presume the value got by compensating the first frictional coefficient according to the car speed as a car wheel frictional coefficient(μ). The pressure intensifying time calculation step is to calculate pressure intensifying time by multiplying the car wheel frictional coefficient(μ) by the significance(K1) and adding the compensating value(K2). The braking pressure maintaining time calculation step is to calculate the braking pressure maintaining time using the amount, the pitch and the time of intensified pressure,.
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