Reference value correcting device in driven wheel slip control system
First Claim
1. A reference value correcting device in a driven wheel slip control system for estimating a slip state of a driven wheel to control a driving torque by calculating a slip rate of the driven wheel, based on a driven wheel speed and a vehicle speed, and by comparing said slip rate with a slip-controlling reference value, said reference value correcting device comprising:
- a reference value calculating means for calculating the slip-controlling reference value based on said vehicle speed;
a turning-state detecting means for detecting that the vehicle is in a predetermined turning state;
a correction value calculating means for calculating a correction value which corrects the slip-controlling reference value based on the vehicle speed and a steered state, when the vehicle is in the predetermined turning state; and
a reference value correcting means for correcting said slip-controlling reference value by said correction value.
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Accused Products
Abstract
A reference value for a traction control is calculated based on a vehicle speed. When a vehicle is in a predetermined turning state, so that a driven wheel speed is equal to or lower than a predetermined value and a lateral acceleration is equal to or larger than a predetermined value, a correction value is searched from a table based on the vehicle speed and a steering angle to correct an error of the reference value generated due to a difference between the locus of the driven wheels and the locus of the follower wheels during turning of the vehicle. The reference value is corrected by subtracting the correction value from the reference value (when the vehicle is a rear wheel drive vehicle) or by adding the correction value to the reference value (when the vehicle is a front wheel drive vehicle. Thus, the reference value for the fraction control such as a reference value for a target slip rate can be accurately in accordance with the turning state of the vehicle.
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Citations
4 Claims
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1. A reference value correcting device in a driven wheel slip control system for estimating a slip state of a driven wheel to control a driving torque by calculating a slip rate of the driven wheel, based on a driven wheel speed and a vehicle speed, and by comparing said slip rate with a slip-controlling reference value, said reference value correcting device comprising:
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a reference value calculating means for calculating the slip-controlling reference value based on said vehicle speed;
a turning-state detecting means for detecting that the vehicle is in a predetermined turning state;a correction value calculating means for calculating a correction value which corrects the slip-controlling reference value based on the vehicle speed and a steered state, when the vehicle is in the predetermined turning state; and a reference value correcting means for correcting said slip-controlling reference value by said correction value. - View Dependent Claims (2, 3, 4)
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Specification