Control system for excessive slip prevention on starting and acceleration of motor vehicle
First Claim
1. A wheel slip control apparatus for use in a motor vehicle including engine-output regulating actuator means for regulating the output of an internal combustion engine mounted on said vehicle and braking force regulating actuator means for regulating a braking force to be applied to at least one driven-wheel of said vehicle, comprising:
- speed deriving means for deriving a rotational speed of said driven-wheel;
acceleration-slip detecting means for detecting the occurrence of acceleration-slip of said driven-wheel on the basis of at least the rotational speed of said driven-wheel derived by said speed deriving means and generating a signal indicative of the acceleration-slip;
brake calculation means responsive to the acceleration-slip signal for calculating a reference control value of a braking force to be applied to said driven-wheel on the basis of a parameter representing a state of said driven-wheel and an operation amount of said engine-output regulating actuator means representing the output of said engine so as to suppress the acceleration-slip and for supplying a brake control signal indicative of the calculated braking-force reference control value to said braking force regulating actuator means so as to control the braking force applied to said driven-wheel in accordance with the calculated braking-force reference control value; and
engine output calculation means responsive to the brake control signal from said brake calculation means for calculating an engine output control amount on the basis of the braking-force reference control value calculated in said brake calculation means and for supplying an engine-output control signal indicative of the calculated engine output control amount to said engine-output regulating actuator means so as to decrease the engine output by a value corresponding to the calculated braking-force reference control value.
1 Assignment
0 Petitions
Accused Products
Abstract
A wheel slip control apparatus for prevention of excessive wheel-slip on acceleration of a vehicle, which includes an engine-output regulating actuator and a braking force regulating actuator. The wheel slip control apparatus comprises a braking force control unit coupled to the braking force regulating actuator and an engine output control unit coupled to the engine-output regulating actuator, which operate in response to the detection of the acceleration-slip occurring with respect to the driven-wheel. The braking force control unit calculates a reference control value of a braking force to be applied to the driven-wheel on the basis of a parameter representing a state of the driven-wheel so as to suppress the acceleration-slip and generates a brake control signal indicative of the calculated braking-force reference control value. Meanwhile, the engine-output control unit is responsive to the brake control signal therefrom to calculate an engine output control amount on the basis of the braking-force reference control value and to supply an engine-output control signal indicative of the calculated engine output control amount to the engine-output regulating actuator so as to decrease the engine output by a value corresponding to the calculated braking-force reference control value.
48 Citations
14 Claims
-
1. A wheel slip control apparatus for use in a motor vehicle including engine-output regulating actuator means for regulating the output of an internal combustion engine mounted on said vehicle and braking force regulating actuator means for regulating a braking force to be applied to at least one driven-wheel of said vehicle, comprising:
-
speed deriving means for deriving a rotational speed of said driven-wheel; acceleration-slip detecting means for detecting the occurrence of acceleration-slip of said driven-wheel on the basis of at least the rotational speed of said driven-wheel derived by said speed deriving means and generating a signal indicative of the acceleration-slip; brake calculation means responsive to the acceleration-slip signal for calculating a reference control value of a braking force to be applied to said driven-wheel on the basis of a parameter representing a state of said driven-wheel and an operation amount of said engine-output regulating actuator means representing the output of said engine so as to suppress the acceleration-slip and for supplying a brake control signal indicative of the calculated braking-force reference control value to said braking force regulating actuator means so as to control the braking force applied to said driven-wheel in accordance with the calculated braking-force reference control value; and engine output calculation means responsive to the brake control signal from said brake calculation means for calculating an engine output control amount on the basis of the braking-force reference control value calculated in said brake calculation means and for supplying an engine-output control signal indicative of the calculated engine output control amount to said engine-output regulating actuator means so as to decrease the engine output by a value corresponding to the calculated braking-force reference control value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A wheel slip control apparatus for use in a motor vehicle, comprising:
-
engine-output regulating actuator means for regulating an output of an internal combustion engine mounted on said vehicle, said engine-output regulating actuator means including a throttle valve of said engine; braking force regulating actuator means for regulating braking forces to be applied to wheels of said vehicle; first wheel-speed detecting means for detecting rotational speeds of driven wheels of said wheels of said motor vehicle and for generating first detection signals indicative of the detected rotational speeds of the driven wheels; second wheel-speed detecting means for detecting rotational speeds of non-driven wheels of said wheels of said motor vehicle and for generating second detection signals indicative of the detected rotational speeds of the non-driven wheels; throttle detecting means for detecting an opening degree of said throttle valve and for generating a signal indicative of the detected throttle opening degree; and electronic control means responsive to said first and second detection signals and said throttle opening signal for controlling said engine-output regulating actuator means and said braking force regulating actuator means, said electronic control means including; first means for calculating wheel speeds and wheel accelerations on the basis of said first and second detection signals; second means for calculating wheel speeds of said driven wheels under a condition of no occurrence of slipping on the basis of said second detection signals to obtain an average value of the driven-wheel speeds and an acceleration corresponding to the average value; third means for calculating a speed and acceleration of said motor vehicle on the basis of said first and second detection signals; fourth means for determining a slip reference speed on the basis of said second detection signals under a condition of no slip; fifth means for comparing the determined slip reference speed with said average value of the obtained driven-wheel speeds; sixth means for determining a target throttle opening degree when the determined reference speed is greater than the average value of the obtained driven-wheel speeds; seventh means for comparing the determined target throttle opening degree with a value corresponding to an operation amount of an acceleration-pedal of said motor vehicle; eighth means for operating said engine-output regulating actuator means when the value corresponding to the operation amount of said acceleration-pedal is greater than the target throttle opening degree, so that the throttle opening degree of said throttle valve becomes equal to the target throttle opening degree; ninth means for calculating a reference control value for the braking of said driven wheels when the determined reference speed is smaller than the average value of the obtained driven-wheel speeds so as to control said braking force regulating actuator means in accordance with the calculated reference control value; and tenth means for calculating an engine output control amount on the basis of the calculated reference control value and for controlling engine-output regulating actuator means in accordance with the calculated engine output control amount so as to decrease the engine output by a value corresponding to the calculated reference control value. - View Dependent Claims (9, 10, 11, 12, 13)
-
-
14. A wheel slip control apparatus for use in a motor vehicle, comprising:
-
engine-output regulating actuator means for regulating an output of an internal combustion engine mounted on said vehicle by operating a throttle valve of said engine; braking force regulating actuator means for regulating a braking force of said vehicle; first wheel-speed detecting means for detecting rotational speeds of driven wheels of said motor vehicle and for generating first detection signals indicative of the detected rotational speeds of the driven wheels; second wheel-speed detecting means for detecting rotational speeds of non-driven wheels thereof and for generating second detection signals indicative of the detected rotational speeds of said non-driven wheels; throttle detecting means for detecting an opening degree of said throttle valve and for generating a signal indicative of the detected throttle opening degree; and electronic control means responsive to said first and second detection signals and said throttle opening signal for controlling said engine-output regulating actuator means and said braking force regulating actuator means, said electronic control means including; means for calculating wheel accelerations on the basis of said first and second detection signals; means for calculating wheel speeds of said driven wheels under a condition of no occurrence of slipping on the basis of said second detection signals to obtain an average value of the driven-wheel speeds and an acceleration corresponding to the average value; means for calculating speed and acceleration of said motor vehicle on the basis of said first and second detection signals; means for determining a slip reference speed on the basis of said second detection signals under a condition of no slip; means for comparing the determined target throttle opening degree with a value corresponding to an operation amount of an acceleration-pedal of said motor vehicle; means for operating said engine-output regulating actuator means when the value corresponding to the operation amount of said acceleration-pedal is greater than the target throttle opening degree, so that the throttle opening degree of said throttle valve becomes equal to the target throttle opening degree; means for calculating a reference control value for the braking of said driven wheels when the determined reference speed is smaller than the average value of the obtained driven-wheel speeds so as to control said braking force regulating actuator means in accordance with the calculated reference control value; and means for calculating an engine output control amount on the basis of the calculated reference control value and for controlling engine-output regulating actuator means in accordance with the calculated engine output control amount so as to decrease the engine output by a value corresponding to the calculated reference control value.
-
Specification