Traction control system for automotive vehicles

An automobile traction control system in combination with a throttle control system of an internal combustion engine for controlling traction of drive wheels, comprising:

• a sub-throttle disposed upstream of a main throttle linked to an accelerator pedal, for adjusting an engine-power by varying an opening amount of said sub-throttle;
• means for detecting a slip amount of the drive wheel and for producing a slip-amount indicative signal value;
• control means responsive to said slip-amount indicative signal value for controlling the opening amount of said sub-throttle to reduce an engine-power irrespective of an accelerator pedal work when said slip-amount indicative signal value exceeds a predetermined threshold;
• means for detecting a vehicle speed and for producing a vehicle-speed indicative signal value;
• means for detecting an opening amount of the accelerator and for producing an accelerator-opening-amount indicative signal value;
• and
• means for detecting a friction coefficient of a road surface and for producing a friction-coefficient indicative signal value,
• wherein said control means responsive to a particular condition in which said vehicle-speed indicative signal value is below a predetermined low speed, said accelerator-opening-amount indicative signal value is above a predetermined amount, and said friction-coefficient indicative signal value is below a predetermined low friction coefficient, for increasing the opening amount of said sub-throttle slowly, after adjusting the opening amount of said sub-throttle to a predetermined low value nearly equal to irrespective of said slip-amount indicative signal value, in presence of said particular condition.

An automobile traction control system in combination with a throttle control system of an internal combustion engine for controlling traction of drive wheels, comprising:

• a sub-throttle disposed upstream of a main throttle linked to an accelerator pedal, for adjusting an engine-power by varying an opening amount of said sub-throttle;
• means for detecting a slip amount of the drive wheel and for producing a slip-amount indicative signal value;
• control means responsive to said slip-amount indicative signal value for controlling the opening amount of said sub-throttle to reduce an engine-power irrespective of an accelerator pedal work when said slip-amount indicative signal value exceeds a predetermined threshold;
• means for detecting a vehicle speed and for producing a vehicle-speed indicative signal value;
• means for detecting an opening amount of the accelerator and for producing an accelerator-opening-amount indicative signal value;
• means for detecting an actual opening amount of said sub-throttle and for producing a throttle-opening-amount indicative signal value;
• and
• means for detecting a friction coefficient of a road surface and for producing a friction-coefficient indicative signal value,
• wherein said control means responsive to a particular condition in which said vehicle-speed indicative signal value is below a predetermined low speed, said accelerator-opening-amount indicative signal value is above a predetermined amount, and said friction-coefficient indicative signal value is below a predetermined low friction coefficient, for slowly increasing the opening amount of said sub-throttle at a first throttle-opening velocity based on a deviation between said accelerator-opening-amount indicative signal value and said throttle-opening-amount indicative signal value or at a second throttle-opening velocity based on only said accelerator-opening-amount indicative signal value, after adjusting the opening amount of said sub-throttle to a value substantially corresponding to a substantially closed position of said sub-throttle irrespective of said slip-amount indicative signal value, in presence of said particular condition.

An automobile traction control system in combination with a throttle control system of an internal combustion engine for controlling traction of drive wheels, comprising:

• a sub-throttle disposed upstream of a main throttle linked to an accelerator pedal, for adjusting an engine-power by varying an opening amount of said sub-throttle;
• means for detecting a slip amount of the drive wheel and for producing a slip-amount indicative signal value;
• means for detecting a vehicle speed and for producing a vehicle-speed indicative signal value;
• means for detecting an opening amount of the accelerator and for producing an accelerator-opening-amount indicative signal value;
• means for detecting a friction coefficient of a road surface and for producing a friction-coefficient indicative signal value;
• control means for controlling the opening amount of said sub-throttle at a first mode in which the opening amount of said sub-throttle is increased slowly at a restricted throttle-opening velocity from a predetermined value irrespective of said slip-amount indicative signal value, under a particular condition in which said vehicle-speed indicative signal value is below a predetermined low speed, said accelerator-opening-amount indicative signal value is above a predetermined amount, and said friction-coefficient indicative signal value is below a predetermined low friction coefficient;
• and
• said control means controlling the opening amount of said sub-throttle at a second mode except said particular condition in which mode the opening amount of said sub-throttle is controlled to reduce said slip-amount indicative signal value toward a target slip amount when said slip-amount indicative signal value exceeds a predetermined threshold.