Traction control system for automotive vehicles
First Claim
1. An automobile traction control system in combination with a throttle control system of an internal combustion engine for controlling traction of drive wheels, comprising:
- 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 an opening amount of a throttle of the engine 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 reducing the opening amount of said throttle to a predetermined value irrespective of said slip-amount indicative signal value, in presence of said particular condition.
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Accused Products
Abstract
An automobile traction control system in combination with a throttle control system of an internal combustion engine for controlling traction of drive wheels, comprises a sub-throttle for adjusting an engine-power by varying its opening amount and a controller responsive to a slip amount of the drive wheel for controlling the sub-throttle opening to reduce an engine-power irrespective of an accelerator pedal work when the slip amount exceeds a predetermined threshold. To effectively suppress undesired acceleration-slip for example when starting on a low-μ road, the controller performs a sub-throttle slow-opening control under a particular condition of at least a low vehicle speed, a low-μ road and a great depression of an accelerator. During the slow-opening control, the sub-throttle opening increases slowly, after once adjusting the sub-throttle opening essentially to zero irrespective of the slip amount of the drive wheel.
52 Citations
14 Claims
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1. An automobile traction control system in combination with a throttle control system of an internal combustion engine for controlling traction of drive wheels, comprising:
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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 an opening amount of a throttle of the engine 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 reducing the opening amount of said throttle to a predetermined value irrespective of said slip-amount indicative signal value, in presence of said particular condition.
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2. An automobile traction control system in combination with a throttle control system of an internal combustion engine for controlling traction of drive wheels, comprising:
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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. - View Dependent Claims (3, 4, 5, 6, 7, 8)
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9. An automobile traction control system in combination with a throttle control system of an internal combustion engine for controlling traction of drive wheels, comprising:
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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. - View Dependent Claims (10, 11)
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12. An automobile traction control system in combination with a throttle control system of an internal combustion engine for controlling traction of drive wheels, comprising:
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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. - View Dependent Claims (13, 14)
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Specification