Traction control apparatus
First Claim
1. A traction control apparatus comprising:
- driving wheel velocity detecting means for detecting a driving wheel of the vehicle;
driven wheel velocity detecting means for detecting a driven wheel velocity of the vehicle;
reference velocity setting means for setting a reference velocity on the basis of an output from said driven wheel velocity detecting means;
slip value detecting means for detecting a slip value of the driving wheel on the basis of a difference between the driving wheel velocity and the reference velocity;
control start instruction means for outputting at least an engine control start signal when a slip state of the driving wheel including at least the slip value satisfies a predetermined control start condition;
vehicle acceleration calculating means for calculating a vehicle acceleration of the vehicle on the basis of the output from said driven wheel velocity detecting means;
reference drive torque calculating means for calculating a reference drive torque on the basis of an output from said vehicle acceleration calculating means;
target output torque setting means for determining a target output torque of the engine in accordance with an output from said reference drive torque calculating means;
correction torque setting means for setting a correction torque on the basis of an output from said slip value detecting means, comprising proportional correction torque calculating means for calculating a proportional correction torque proportional to the slip value and integral correction torque calculating means for calculating an integral correction torque on the basis of an integral value of the slip value;
target output torque correcting means for correcting the target output torque in accordance with an output from said correction torque setting means;
drive torque control means for, when the engine control start signal is output, controlling an engine output of the vehicle in accordance with the corrected target output torque to control the drive torque of the driving wheel; and
shift change operation detecting means for detecting a shift change of a transmission of the vehicle, wherein when said shift change operation detecting means detects the shift change operation, said integral correction torque calculating means integrates the slip value to get an integral result while excluding a period of the shift change operation from an integral period of the slip value so as to calculate the integral correction torque in accordance with the integral result.
2 Assignments
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Accused Products
Abstract
Driving and driven wheel velocities of a vehicle are detected by wheel velocity sensors, and a change in driven wheel velocities as a function of time is detected to obtain a driven wheel acceleration by the vehicle acceleration calculating section. A reference target torque is calculated on the basis of the driven wheel acceleration. A slip value of the driving wheels is calculated on the basis of the driving and driven wheel velocities, and a correction torque corresponding to the slip value is calculated every predetermined sampling time at TSn calculating section and TPn calculating section. The correction torque is substracted from the reference target torque to obtain a target engine torque. An engine output is controlled to obtain the target engine torque.
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Citations
15 Claims
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1. A traction control apparatus comprising:
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driving wheel velocity detecting means for detecting a driving wheel of the vehicle; driven wheel velocity detecting means for detecting a driven wheel velocity of the vehicle; reference velocity setting means for setting a reference velocity on the basis of an output from said driven wheel velocity detecting means; slip value detecting means for detecting a slip value of the driving wheel on the basis of a difference between the driving wheel velocity and the reference velocity; control start instruction means for outputting at least an engine control start signal when a slip state of the driving wheel including at least the slip value satisfies a predetermined control start condition; vehicle acceleration calculating means for calculating a vehicle acceleration of the vehicle on the basis of the output from said driven wheel velocity detecting means; reference drive torque calculating means for calculating a reference drive torque on the basis of an output from said vehicle acceleration calculating means; target output torque setting means for determining a target output torque of the engine in accordance with an output from said reference drive torque calculating means; correction torque setting means for setting a correction torque on the basis of an output from said slip value detecting means, comprising proportional correction torque calculating means for calculating a proportional correction torque proportional to the slip value and integral correction torque calculating means for calculating an integral correction torque on the basis of an integral value of the slip value; target output torque correcting means for correcting the target output torque in accordance with an output from said correction torque setting means; drive torque control means for, when the engine control start signal is output, controlling an engine output of the vehicle in accordance with the corrected target output torque to control the drive torque of the driving wheel; and shift change operation detecting means for detecting a shift change of a transmission of the vehicle, wherein when said shift change operation detecting means detects the shift change operation, said integral correction torque calculating means integrates the slip value to get an integral result while excluding a period of the shift change operation from an integral period of the slip value so as to calculate the integral correction torque in accordance with the integral result. - View Dependent Claims (2, 3)
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4. A traction control apparatus comprising:
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driving wheel velocity detecting means for detecting a driving wheel velocity of the vehicle; driven wheel velocity detecting means for detecting a driven wheel velocity of the vehicle; reference velocity setting means for setting a reference velocity on the basis of an output from said driven wheel velocity detecting means; slip value detecting means for detecting a slip value of the driving wheel on the basis of a difference between the driving wheel velocity and the reference velocity; control start instruction means for outputting at least an engine control start signal when a slip state of the driving wheel including at least the slip value satisfies a predetermined control start condition; vehicle acceleration calculating means for calculating an acceleration of the vehicle on the basis of the output from said driven wheel velocity detecting means; reference drive torque calculating means for calculating a reference drive torque on the basis of an output from said vehicle acceleration calculating means; target output torque setting means for determining a target output torque of the engine in accordance with an output from said reference drive torque calculating means; correction torque calculation gain changing means for, when the slip value is larger than a predetermined value, the gain upon calculation of the correction torque is set to be smaller than the gain when the slip value is smaller than the predetermined value; target output torque correcting means for correcting the target output torque in accordance with an output from said correction torque setting means; and drive torque control means for, when the engine control start signal is output, controlling an engine output of the vehicle in accordance with the corrected target output torque to control the drive torque of the driving wheel.
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5. A traction control apparatus comprising:
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driving wheel velocity detecting means for detecting a driving wheel velocity of the vehicle; driven wheel velocity detecting means for detecting a driven wheel velocity of the vehicle; reference velocity setting means for setting a reference velocity on the basis of an output from said driven wheel velocity detecting means; slip value detecting means for detecting a slip value of the driving wheel on the basis of a difference between the driving wheel velocity and the reference velocity; control start instruction means for outputting at least an engine control start signal when a slip state of the driving wheel including at least the slip value satisfies a predetermined control start condition; vehicle acceleration calculating means for calculating a vehicle acceleration of the vehicle on the basis of the output from said driven wheel velocity detecting means; reference drive torque calculating means for calculating a reference drive torque on the basis of an output from said vehicle acceleration calculating means; target output torque setting means for determining a target output torque of the engine in accordance with an output from said reference drive torque calculating means; correction torque setting means for setting a correction torque on the basis of an output from said slip value detecting means; target output torque correcting means for correcting the target output torque in accordance with an output from said correction torque setting means; drive torque control means for, when the engine control start signal is output, controlling an engine output of the vehicle in accordance with the corrected target output torque to control the drive torque of the driving wheel; and shift position detecting means for detecting a currently used shift position of a transmission of the vehicle, wherein said correction torque setting means further comprises correction torque changing means for changing the correction torque based on the slip value in accordance with the shift position detected by said shift position detecting means, said correction torque changing means being started in accordance with a new speed mode of the transmission, if shifted, and the timing for starting said correction torque changing means is delayed in the case of shifting up whereas the timing for starting said correction torque changing means remains the same in the case of shifting down. - View Dependent Claims (6, 7)
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8. A traction control apparatus comprising:
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driving wheel velocity detecting means for detecting a driving wheel velocity of the vehicle; driven wheel velocity detecting means for detecting a driven wheel velocity of the vehicle; reference velocity setting means for setting a reference velocity of the basis of an output from said driven wheel velocity detecting means; slip value detecting means for detecting a slip value of the driving wheel on the basis of a difference between the driving wheel velocity and the reference velocity; control start instruction means for outputting at least an engine control start signal when a slip state of the driving wheel including at least the slip value satisfies a predetermined control start condition; vehicle acceleration calculating means for calculating an acceleration of the vehicle on the basis of the output from said driven wheel velocity detecting means; delay filter means for receiving the vehicle acceleration, outputting a correction acceleration which changes to have a predetermined delay time with respect to a change in the vehicle acceleration, and changing the predetermined delay in accordance with a drive state of the vehicle including at least a change in the vehicle acceleration; reference drive torque calculating means for calculating the reference drive torque necessary for the vehicle to travel with the correction acceleration on the basis of an output from said delay filter means; target output torque setting means for determining a target output torque of the engine in accordance with an output from said reference drive torque calculating means; correction torque setting means for setting a correction torque on the basis of an output from said slip value detecting means; target output torque correcting means for correcting the target output torque in accordance with an output from said correction torque setting means; and drive torque control means for, when the engine control start signal is output, controlling an engine output of the vehicle in accordance with the corrected target output torque to control the drive torque of the driving wheel. - View Dependent Claims (9, 10)
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11. A traction control apparatus comprising:
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driving wheel velocity detecting means for detecting a driving wheel velocity of the vehicle; driven wheel velocity detecting means for detecting a driven wheel velocity of the vehicle; reference velocity setting means for setting a reference velocity on the basis of an output from said driven wheel velocity detecting means; slip value detecting means for detecting a slip value of the driving wheel on the basis of a difference between the driving wheel velocity and the reference velocity; control start instruction means for outputting at least an engine control start signal when a slip state of the driving wheel including at least the slip value satisfies a predetermined control start condition; vehicle acceleration calculating means for calculating an acceleration of the vehicle on the basis of the output from said driven wheel velocity detecting means; reference drive torque calculating means for calculating a reference drive torque on the basis of an output from said vehicle acceleration calculating means; target output torque setting means for determining a target output torque of the engine in accordance with an output from said reference drive torque calculating means; correction torque setting means for setting a correction torque on the basis of an output from said slip value detecting means; target output torque correcting means for correcting the target output torque in accordance with an output from said correction torque setting means; target torque limiting means for limiting the target engine torque to a value equal to or larger than a predetermined value; and lower limit changing means for changing the predetermined value of the target engine torque in accordance with a lapse of time from the beginning of the outputting of the engine control start signal.
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12. A traction control apparatus comprising:
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driving wheel velocity detecting means for detecting a driving wheel velocity of the vehicle; driven wheel velocity detecting means for detecting a driven wheel velocity of the vehicle; reference velocity setting means for setting a reference velocity on the basis of an output from said driven wheel velocity detecting means; slip value detecting means for detecting a slip value of the driving wheel on the basis of a difference between the driving wheel velocity and the reference velocity; control start instruction means for outputting at least an engine control start signal when a slip state of the driving wheel including at least the slip value satisfies a predetermined control start condition; vehicle acceleration calculating means for calculating an acceleration of the vehicle on the basis of the output from said driven wheel velocity detecting means; reference drive torque calculating means for calculating a reference drive torque on the basis of an output from said vehicle acceleration calculating means; target output torque setting means for determining a target output torque of the engine in accordance with an output from said reference drive torque calculating means; correction torque setting means for setting a correction torque on the basis of an output from said slip value detecting means; target output torque correcting means for correcting the target output torque in accordance with an output from said correction torque setting means; target torque limiting means for limiting the target engine torque to a value equal to or larger than a predetermined value; and lower limit changing means for changing the predetermined value of the target engine torque in accordance with an output from a drive state detecting means. - View Dependent Claims (13)
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14. A traction control apparatus comprising:
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driving wheel velocity detecting means for detecting a driving wheel velocity of the vehicle; driven wheel velocity detecting means for detecting a driven wheel velocity of the vehicle; reference velocity setting means for setting a reference velocity on the basis of an output from said driven wheel velocity detecting means; slip value detecting means for detecting a slip value of the driving wheel on the basis of a difference between the driving wheel velocity and the reference velocity; control start instruction means for outputting at least an engine control start signal when a slip state of the driving wheel including at least the slip value satisfies a predetermined control start condition, wherein said control start instruction means outputs one of the engine control start signal and a brake control start signal for instructing the start of traction control with respect to a brake of the driving wheel; vehicle acceleration calculating means for calculating an acceleration of the vehicle on the basis of the output from said driven wheel velocity detecting means; reference drive torque calculating means for calculating a reference drive torque on the basis of an output from said vehicle acceleration calculating means; target output torque setting means for determining a target output torque of the engine in accordance with an output from said reference drive torque calculating means; correction torque setting means for setting a correction torque on the basis of an output from said slip value detecting means; target output torque correcting means for correcting the target output torque in accordance with an output from said correction torque setting means; and drive torque control means comprising engine control means for, when the engine control start signal is output, controlling an engine output of the vehicle in accordance with the corrected target output torque, and brake control means for, when the brake control start signal is output, controlling the brake in accordance with the slip value, wherein said brake control means comprises; a hydraulic pressure path formed between a wheel cylinder for applying a braking force to the driving wheel and a master cylinder; a cutoff valve, provided to said hydraulic pressure path, for cutting off the hydraulic pressure path; a pressure increasing valve for increasing a hydraulic pressure between said cutoff valve and said wheel cylinder; a pressure decreasing valve for decreasing said hydraulic pressure between said cutoff valve and said wheel cylinder; slip variation calculating means for calculating a variation in the slip value as a function of time; hydraulic pressure variation setting means for setting every predetermined period that occurs when there is hydraulic pressure variation between said cutoff valve and said wheel cylinder; drive time setting means for setting a drive time of said pressure increasing or decreasing valve in accordance with an output from said hydraulic pressure variation setting means; and valve drive control means for, when the brake control start signal is output, driving said cutoff valve to cut off said hydraulic pressure path and driving said pressure increasing and decreasing valves in accordance with an output from said drive time setting means. - View Dependent Claims (15)
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Specification