Traction control system for automotive vehicle

A traction control system for an automotive vehicle, comprising:

• slip detecting means for detecting a slip value of a driven wheel on road surface;
• braking force adjusting means for adjusting braking force to the driven wheel;
• particular travelling state detecting means for detecting a particular travelling state in which a travelling state of the automotive vehicle is different from a basic travelling state;
• peripheral speed detecting means for detecting a peripheral speed of the driven wheel;
• differentiation means for differentiating the peripheral speed of the driven wheel to obtain a differentiated value of the peripheral speed thereof;
• first control amount determining means for determining a first control amount for said braking force adjusting means based on the differentiated value of the peripheral speed thereof so that said first control amount is set greater as the differentiated value becomes greater in accordance with the basic travelling state in order to bring the slip value detected by said slip detecting means into agreement with a first predetermined target value for controlling a brake;
• second control amount determining means for determining a second control amount for said braking force adjusting means based on the differentiated value of the peripheral speed of the driven wheel so that the second control amount is set greater as the differentiated value becomes greater in accordance with the particular travelling state in order to bring the slip value detected by said slip detecting means into agreement with a second predetermined target value for controlling the brake, said second control amount is set so as to increase the braking force more than said first control amount;
• and
• brake control means for controlling said braking force adjusting means by the first control amount in an ordinary travelling state and by the second control amount when said particular travelling state is detected by said particular travelling state detecting means.

A traction control system for an automotive vehicle, comprising:

• slip detecting means for detecting a slip value of a driven wheel on road surface;
• braking force adjusting means for adjusting braking force to the driven wheel;
• particular travelling state detecting means for detecting a particular travelling state in which a travelling state of the automotive vehicle is different from a basic travelling state;
• peripheral speed detecting means for detecting a peripheral speed of the driven wheel;
• differentiation means for differentiating the peripheral speed of the driven wheel to obtain a differentiated value of the peripheral speed thereof;
• first control amount determining means for determining a first control amount for said braking force adjusting means based on the differentiated value of the peripheral speed thereof so that said first control amount is set greater as the differentiated value becomes greater in accordance with the basic travelling state in order to bring the slip value detected by said slip detecting means into agreement with a first predetermined target value for controlling a brake;
• second control amount determining means for determining a second control amount for said braking force adjusting means based on the differentiated value of the peripheral speed of the driven wheel so that the second control amount is set greater as the differentiated value becomes greater in accordance with the particular travelling state in order to bring the slip value detected by said slip detecting means into agreement with a second predetermined target value for controlling the brake;
• brake control means for controlling the braking force adjusting means by the first control amount in an ordinary travelling state and by the second control amount when the particular travelling state is detected by the particular travelling state detecting means;
• and
• the basic travelling state is a state in which the automotive vehicle is travelling on a flat road and straight forward;
• the particular travelling state detecting means comprises first particular travelling state detecting means for detecting a state in which the automotive vehicle is travelling on a bad road and second particular travelling state detecting means for detecting a state in which the automotive vehicle is cornering;
• and
• the second control amount is set so as to reduce the braking force when the state in which the automotive vehicle is travelling on the bad road is detected by the first particular travelling state detecting means and so as to increase the braking force when the state in which the automotive vehicle is cornering is detected by the second particular travelling state detecting means.

A traction control system for an automotive vehicle, comprising:

• slip detecting means for detecting a slip value of a driven wheel on a road surface;
• braking force adjusting means for adjusting braking force to the driven wheel;
• particular travelling state detecting means for detecting a particular travelling state in which a travelling state of the automotive vehicle is different from a basic travelling state, said particular travelling state detecting means being capable of detecting when the automotive vehicle is travelling on a bad road and when the automotive vehicle is cornering;
• peripheral speed detecting means for detecting a peripheral speed of the driven wheel;
• differentiation means for differentiating the peripheral speed of the driven wheel to obtain a differentiated value of the peripheral speed thereof;
• first control amount determining means for determining a first control amount for said braking force adjusting means based on the differentiated value of the peripheral speed thereof so that said first control amount is set greater as the differentiated value becomes greater in accordance with the basic travelling state in order to bring the slip value detected by the slip detecting means into agreement with a first predetermined target value for controlling a brake;
• second control amount determining means for determining a second control amount for said braking force adjusting means based on the differentiated value of the peripheral speed of the driven wheel so that the second control amount is set greater as the differentiated value becomes greater in accordance with the particular travelling state in order to bring the slip value detected by the slip detecting means into agreement with a second predetermined target value for controlling the brake, said second control amount is set so as to reduce the braking force more than said first control amount;
• and
• brake control means for controlling the braking force adjusting means by the first control amount in the basic travelling state and by the second control amount when the particular travelling state is detected by the particular travelling state detecting means, and correction by said brake control means when the automotive vehicle is travelling on a bad road is made before correction when the automotive vehicle is cornering.