EP0338538A2
Expired / Lapsed
EP
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Traction control apparatus
Assignee: Mitsubishi Motors Corp
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Filing: 1989-04-19
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Granted: —
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Expires: 2009-04-19
Abstract
Abstract Driving and driven wheel velocities of a vehicle are detected by wheel velocity sensors (11 - 14), 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 (47). A reference target torque (TG) 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 (55) and TPn calculating section (56). The correction torque is subtracted from the reference target torque to obtain a target engine torque (TG). An engine output is controlled to obtain the target engine torque.
Inventors
- 👤 Masayuki Hashiguchi
- 👤 Kiichi Yamada
- 👤 Masayoshi Ito
- 👤 Atsuhiro Kawano
- 👤 Susumu Nishikawa
- 👤 Takeshi Funakoshi
- 👤 Shuji Ikeda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 12:35
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/58; B60T8/17; B60T8/175; B60G; B60G2800/00; B60G2800/90; B60G2800/92; B60G2800/95; B60G2800/97
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
305 words
A traction control apparatus characterized by comprising: drive state detecting means (112) for detecting a drive state of a vehicle; driving wheel velocity detecting means (11, 12) for detecting a driving wheel velocity of the vehicle; driven wheel velocity detecting means (13, 14) for detecting a driven wheel velocity of the vehicle; reference velocity setting means (51, 52, 53) for setting a reference velocity on the basis of an output from said driven wheel velocity detecting means; slip value detecting means (54) 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 (391) 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 (47) 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 (49) for calculating a reference drive torque on the basis of an output from said vehicle acceleration calculating means; target output torque setting means (60) 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 (55, 56) for setting a correction torque on the basis of an output from said slip value detecting means; target output torque correcting means (57, 59) for correcting the target output torque in accordance with an output from said correction torque setting means; and drive torque control means (163 - 68) 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.
Claim 2
Dependent Claim
305 words
A traction control apparatus characterized by comprising: drive state detecting means (112) for detecting a drive state of a vehicle; driving wheel velocity detecting means (11, 12) for detecting a driving wheel velocity of the vehicle; driven wheel velocity detecting means (13, 14) for detecting a driven wheel velocity of the vehicle; reference velocity setting means (51, 52, 53) for setting a reference velocity on the basis of an output from said driven wheel velocity detecting means; slip value detecting means (54) 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 (391) 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 (47) 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 (49) for calculating a reference drive torque on the basis of an output from said vehicle acceleration calculating means; target output torque setting means (60) 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 (55, 56) for setting a correction torque on the basis of an output from said slip value detecting means; target output torque correcting means (57, 59) for correcting the target output torque in accordance with an output from said correction torque setting means; and drive torque control means (163 - 68) 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.
Claim 3
Dependent Claim
58 words
An apparatus according to claim 1, characterized in that said correction torque setting means (55, 56) comprises proportional correction torque calculating means (56) for calculating a proportional correction torque proportional to the slip value, and integral correction torque calculating means (55) for calculating an integral correction torque on the basis of an integral value of the slip value.
Claim 4
Dependent Claim
87 words
An apparatus according to claim 2, characterized by further comprising shift change operation detecting means (551) for detecting a shift change operation of a transmission of the vehicle, and characterized in that when said shift change operation detecting means (571) detects the shift change operation, said integral correction torque calculating means (55) integrates the slip value 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.
Claim 5
Dependent Claim
58 words
An apparatus according to claim 1, characterized in that said correction torque setting means (55, 56) comprises correction torque calculation gain changing means for, when the slip value is larger than a predetermined value, decreasing a gain upon calculation of the correction torque to be smaller than that when the slip value is smaller than the predetermined value.
Claim 6
Dependent Claim
71 words
An apparatus according to claim 1, characterized by further comprising shift position detecting means (861) for detecting a currently used one of shift positions of a transmission of the vehicle, and characterized in that said correction torque setting means (55, 56) comprises correction torque changing means (85, 86) for changing the correction torque based on the slip value in accordance with the shift position detected by said shift position detecting means.
Claim 7
Dependent Claim
62 words
An apparatus according to claim 5, characterized in that when the shift position detected by said shift position detecting means is changed and the change corresponds to a shift-up operation, said correction torque changing means starts changing the correction torque according to the shifted-up shift position after a lapse of a predetermined period of time from the beginning of the shift-up operation.
Claim 8
Dependent Claim
82 words
An apparatus according to claim 5, characterized in that when the shift position (861) detected by said shift position detecting means is changed and the change corresponds to a shift-up operation, said correction torque changing means (85, 86) starts changing the correction torque according to the shifted-up shift position upon completion of the shift-up operation, and when the change corresponds to a shift-down operation, starts changing the correction torque according to the shifted-down shift position at the beginning of the shift-down operation.
Claim 9
Dependent Claim
104 words
An apparatus according to claim 1, characterized in that said reference drive torque calculating means (48, 49) comprises delay filter means (48) for receiving the vehicle acceleration, outputting a correction acceleration which changes to have a predetermined delay time with respect to a change in vehicle acceleration, and changing the delay time in accordance with a drive state of the vehicle including at least a change in the vehicle acceleration, and reference drive torque arithmetic means (49) 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.
Claim 10
Dependent Claim
49 words
An apparatus according to claim 8, characterized in that when the change in the vehicle acceleration is in a direction to decrease the vehicle acceleration, said delay filter means (48) sets the longer delay time than that when the change is in a direction to increase the vehicle acceleration.
Claim 11
Dependent Claim
157 words
An apparatus according to claim 8, characterized in that said delay filter means (48) comprises slip rate calculating means (111) for calculating a slip rate of the driving wheel, and when the slip rate is larger than a predetermined slip rate and the change in vehicle acceleration is in a direction to decrease the vehicle acceleration, said delay filter means sets the longer delay time than that when the slip rate, is equal to or smaller than the predetermined slip rate and the change is in a direction to increase the vehicle acceleration, and when the slip rate is equal to or smaller than the predetermined slip rate and the change in the vehicle acceleration is in a direction to decrease the vehicle acceleration, sets the longer delay time than that when the slip rate is larger than the predetermined slip rate and the change in vehicle acceleration is in a direction to decrease the vehicle acceleration.
Claim 12
Dependent Claim
42 words
An apparatus according to claim 1, characterized in that said drive torque control means (63 - 68) comprises output torque limiting means (66) for limiting a torque output from the engine to be equal to or larger than a predetermined lower limit.
Claim 13
Dependent Claim
65 words
An apparatus according to claim 11, characterized in that said output torque limiting means comprises target torque limiting means (91) for limiting the target engine torque to be equal to or larger than the predetermined lower limit, and lower limit changing means (911) for changing the lower limit in accordance with a lapse of time from the beginning of outputting the engine control start signal.
Claim 14
Dependent Claim
59 words
An apparatus according to claim 11, characterized in that said output torque limiting means comprises target torque limiting means (66) for limiting the target engine torque to be equal to or larger than the predetermined lower limit, and lower limit changing means (661) for changing the lower limit in accordance with an output from said drive state detecting means.
Claim 15
Dependent Claim
81 words
An apparatus according to claim 1, characterized in that said drive torque control means (63 - 68) comprises a throttle valve (THs) for adjusting an amount of air taken in the engine, an actuator (68) for opening/closing said throttle valve′ target opening setting means (65) for setting a target opening of said throttle valve in accordance with the target engine torque corrected by the correction torque, and actuator control means (67) for controlling said actuator in accordance with the target opening.
Claim 16
Dependent Claim
70 words
An apparatus according to claim 14, characterized by further comprising engine speed detecting means for detecting an engine speed, and characterized in that said target opening setting means comprises target opening limiting means (66) for limiting the target opening set in accordance with the engine torque to be equal to or larger than a lower limit opening which changes in accordance with an output from said engine speed detecting means.
Claim 17
Dependent Claim
124 words
An apparatus according to claim 1, characterized in that when the slip state of the driving wheel including at least the slip value satisfies the predetermined control start condition, said control start instruction means (391) outputs the engine control start signal and/or a brake control start signal for instructing start of traction control with respect to a brake of the driving wheel, and said drive torque control means comprises engine control means (60, 61, ...) 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 (35, 36, ...) for, when the brake control start signal is output, controlling the brake in accordance with the slip value.
Claim 18
Dependent Claim
216 words
An apparatus according to claim 16, characterized in that said brake control means (35, 36, ...) comprises: a hydraulic pressure path (201R, 201L) formed between a wheel cylinder for applying a braking force to the driving wheel and a master cylinder; a cutoff valve (202R, 202L), provided to said hydraulic pressure path, for cutting off the hydraulic pressure path a pressure increasing valve (17i, 18i) for increasing a hydraulic pressure between said cutoff valve and said wheel cylinder; a pressure decreasing valve (17o, 18o) for decreasing a hydraulic pressure between said cutoff valve and said wheel cylinder slip variation calculating means (35, 36) for calculating a variation in the slip value as a function of time; hydraulic pressure variation setting means (37, 38) for setting every predetermined period a hydraulic pressure variation between said cutoff valve and said wheel cylinder; drive time setting means (40, 43) 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 (45, 46) 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.
Claim 19
Dependent Claim
159 words
An apparatus according to claim 17, characterized in that said drive time setting means comprises: drive time converting means (40, 43) for converting the hydraulic pressure variation into a drive time of said pressure increasing or decreasing valve; drive time accumulating means (411, 441) for calculating an accumulation value of drive times of the the pressure increasing valve, which are set every said predetermined period during an interval from when outputting of the brake control start signal is started until an immediately preceding control period, and for calculating an accumulation value of drive times of the pressure decreasing valve, which are set every said predetermined period during the interval; and drive time correcting means (412, 442) for correcting the drive time of said pressure increasing valve in a present control period in accordance with the accumulation value of the drive times of said pressure increasing valve and the accumulation value of the drive times of the pressure decreasing valve.
References Cited (Backward Citations)
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