Braking force control device and method thereof
First Claim
1. A braking force control device comprising:
- means for applying braking force to a vehicle;
means for detecting vibration level of a wheel when said braking force is applied;
means for determining a present brake condition based on a vibration level detected by said vibration level detecting means and a predetermined vibration level range of a maximum braking region; and
means for controlling said braking force applying means so that said vibration level determined by said vibration level detecting means is within said predetermined vibration range based on said present brake condition determined by said present brake condition determining means.
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Accused Products
Abstract
To provide optimal braking force control using braking operation data, an ECU in a brake force control system detects a braking operation according to fluctuation components of wheel rotation. That is, the ECU calculates the wheel acceleration and sets a reference load level for the braking operation according to a road surface coefficient of friction at the wheel tire. When the amplitude of the wheel acceleration increases and exceeds the reference load level, the braking load is determined to be heavy. If the braking load is heavy, the ECU decreases the brake oil pressure of the wheel being detected. In this way, the slip ratio can be controlled around a peak road surface coefficient of friction.
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Citations
19 Claims
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1. A braking force control device comprising:
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means for applying braking force to a vehicle; means for detecting vibration level of a wheel when said braking force is applied; means for determining a present brake condition based on a vibration level detected by said vibration level detecting means and a predetermined vibration level range of a maximum braking region; and means for controlling said braking force applying means so that said vibration level determined by said vibration level detecting means is within said predetermined vibration range based on said present brake condition determined by said present brake condition determining means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of controlling braking force for a vehicle comprising steps of:
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applying braking force to a vehicle wheel; detecting motion change of said wheel when said braking force is applied; determining a present brake condition based on said detected motion change and a predetermined vibration level range for said maximum braking region; and changing braking force to be applied to said wheel so that said detected motion change is within said predetermined vibration level range based on said determined present brake condition. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification