US5159991A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slip control system for automotive vehicle
Assignee: Mazda Motor Corp
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Filing: 1991-03-05
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Granted: 1992-11-03
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Expires: 2011-03-05
Abstract
Abstract In performing slip control such as traction control or ABS control, a control degree for slip control is changed in accordance with a temperature of outside air, or outside air temperature. The slip control system enhances response to slip control on a road surface having a lower road surface friction coefficient μ, or a slippery road, and prevent a frequent execution of slip control on a road surface having a higher road surface friction coefficient μ, by appropriating the setting of the road surface friction coefficient μ in accordance with the outside air temperature. A mode of changing the control degree for slip control includes, for example, a change of the condition for starting slip control, a change of a target value for slip control, and a change of an initial value of the road surface friction coefficient μ, in accordance with the outside air temperature.
Inventors
- 👤 Toshiaki Tsuyama
- 👤 Kazutoshi Nobumoto
- 👤 Fumio Kageyama
- 👤 Haruki Okazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:36
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/175; B60T2270/00; B60T2270/20; B60T2270/206; B60T2270/208
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
128 words
A slip control system for an automotive vehicle, comprising: slip detecting means for detecting wheel slip of a driven wheel relative to a surface of the road; torque adjusting means for adjusting torque applied to the wheel by adjusting at least one of engine output and braking force applied to the wheel; slip control means for controlling said torque adjusting means so as to suppress the wheel slip detected by said slip detecting means; outside air temperature sensing means for sensing outside air temperature; and control degree altering means for altering a control degree for slip control to a greater extent when the outside air temperature sensed by said outside air temperature sensing means is lower than a predetermined value than when the outside air temperature is higher.
Claim 2
Dependent Claim
128 words
A slip control system for an automotive vehicle, comprising: slip detecting means for detecting wheel slip of a driven wheel relative to a surface of the road; torque adjusting means for adjusting torque applied to the wheel by adjusting at least one of engine output and braking force applied to the wheel; slip control means for controlling said torque adjusting means so as to suppress the wheel slip detected by said slip detecting means; outside air temperature sensing means for sensing outside air temperature; and control degree altering means for altering a control degree for slip control to a greater extent when the outside air temperature sensed by said outside air temperature sensing means is lower than a predetermined value than when the outside air temperature is higher.
Claim 3
Dependent Claim
80 words
A slip control system as claimed in claim 1 wherein: said control degree for slip control by said slip control means is set in accordance with a road surface friction coefficient μ; and said control degree altering means sets an initial value of said road surface friction coefficient μ to a smaller value when the outside air temperature sensed by said outside air temperature sensing means is lower than said predetermined value than when the outside air temperature is higher.
Claim 4
Dependent Claim
24 words
A slip control system as claimed in claim 2, wherein said control degree gets larger as said road surface friction coefficient μ gets smaller.
Claim 5
Dependent Claim
55 words
A slip control system as claimed in claim 2, wherein: an estimated road surface friction coefficient μ is determined on the basis of a predetermined condition during slip control by said slip control means; and said control degree is set on the basis of said estimated road surface friction coefficient μ during said slip control.
Claim 6
Dependent Claim
40 words
A slip control system as claimed in claim 4, wherein said estimated road surface friction coefficient μ is determined on the basis of a degee of acceleration acting upon a body portion of the automotive vehicle during said slip control.
Claim 7
Dependent Claim
74 words
A slip control system as claimed in claim 1, wherein: said slip control by said slip control means is started when a predetermined condition for starting said slip control is met; and said control degree altering means alters said predetermined condition for starting said slip control so as to perform said slip control more easily when the outside air temperature is lower than said predetermined value than when the outside air temperature is higher.
Claim 8
Dependent Claim
67 words
A slip control system as claimed in claim 6, wherein: said predetermined condition for starting said slip control is set as a predetermined reference value; and said control degree altering means sets said predetermined reference value to a smaller value when the outside air temperature sensed by said outside air temperature sensing means is lower than said predetermined value than when the outside air temperature is higher.
Claim 9
Dependent Claim
85 words
A slip control system as claimed in claim 7, wherein said slip detecting means detects a slip value of the driven wheel relative to the surface of the road; wherein said slip control by said slip control means is performed by traction control for preventing said slip value detected by said slip detecting means from being excessive during acceleration; and wherein said predetermined reference value is set as a reference slip value to be compared with the slip value detected by said slip detecting means.
Claim 10
Dependent Claim
52 words
A slip control system as claimed in claim 7, wherein: said slip control by said slip control means is performed by ABS control for preventing the wheel from being locked relative to the road surface during braking; and said predetermined reference value is set as a degree of deceleration of the wheel.
Claim 11
Dependent Claim
42 words
A slip control system as claimed in claim 7, wherein: said predetermined reference value is set in accordance with the road surface friction coefficient μ; and said control degree altering means alters an initial value of the road surface friction coefficient μ.
Claim 12
Dependent Claim
29 words
A slip control system as claimed in claim 7, wherein said predetermined reference value is corrected in accordance with a running state in which the automotive vehicle is running.
Claim 13
Dependent Claim
43 words
A slip control system as claimed in claim 11, wherein said running state includes at least one of a vehicle speed, an opening angle of an accelerator, a steered angle of a steering wheel, and a running mode set manually by an operator.
Claim 14
Dependent Claim
40 words
A slip control system as claimed in claim 1, wherein said slip control by said slip control means is performed by traction control for preventing slip of the driven wheel relative to the road surface from becoming excessive during acceleration.
Claim 15
Dependent Claim
56 words
A slip control system as claimed in claim 13, wherein: said slip control is performed by temporarily reducing torque applied to the driven wheel by a predetermined torque portion at the time of starting said slip control; and an amount of said torque portion to be reduced temporarily is altered by said control degree altering means.
Claim 16
Dependent Claim
79 words
A slip control system as claimed in claim 14, wherein: said amount of said torque portion to be reduced temporarily is set in accordance with a road surface friction coefficient μ; and said control degree altering means sets an initial value of said road surface friction coefficient μ to a smaller value when the outside air temperature sensed by said outside air temperature sensing means is lower than said predetermined value than when the outside air temperature is higher.
Claim 17
Dependent Claim
35 words
A slip control system as claimed in claim 14, wherein said amount of said torque portion to be reduced temporarily is corrected in accordance with a running state in which the automotive vehicle is running.
Claim 18
Dependent Claim
43 words
A slip control system as claimed in claim 16, wherein said running state includes at least one of a vehicle speed, an opening angle of an accelerator, a steered angle of a steering wheel, and a running mode set manually by an operator.
Claim 19
Dependent Claim
99 words
A slip control system as claimed in claim 13, wherein said slip detecting means detects a slip value of the driven wheel relative to the surface of the road; wherein said slip control is performed by said slip control means so as to make the slip value detected by said slip detecting means a predetermined target value; and said control degree altering means alters said predetermined target value to a smaller value when the outside air temperature sensed by said outside air temperature sensing means is lower than said predetermined value than when the outside air temperature is higher.
Claim 20
Dependent Claim
22 words
A slip control system as claimed in claim 18, wherein said slip control is performed by reducing torque generated by an engine.
Claim 21
Dependent Claim
28 words
A slip control system as claimed in claim 19, wherein said torque generated by the engine is reduced by adjusting an amount of intake air for the engine.
Claim 22
Dependent Claim
26 words
A slip control system as claimed in claim 19, wherein said torque generated by the engine is reduced by adjusting a timing of igniting the engine.
Claim 23
Dependent Claim
20 words
A slip control system as claimed in claim 18, wherein said slip control is performed by braking the driven wheel.
Claim 24
Dependent Claim
25 words
A slip control system as claimed in claim 18, wherein said predetermined target value is set in accordance with a road surface friction coefficient μ.
Claim 25
Dependent Claim
60 words
A slip control system as claimed in claim 23, wherein a lower limit value of the road surface friction coefficient μ for setting said predetermined target value is so set as not to become smaller than a predetermined lower limit value when said outside air temperature sensed by said outside air temperature sensing means is higher than a predetermined value.
Claim 26
Dependent Claim
29 words
A slip control system as claimed in claim 23, wherein said predetermined target value is corrected in accordance with a running state in which the automotive vehicle is running.
Claim 27
Dependent Claim
43 words
A slip control system as claimed in claim 25, wherein said running state includes at least one of a vehicle speed, an opening angle of an accelerator, a steered angle of a steering wheel, and a running mode set manually by an operator.
Claim 28
Dependent Claim
120 words
A slip control system as claimed in claim 13, wherein said slip detecting means detects a slip value of the driven wheel relative to the surface of the road; wherein said slip control by said slip control means is started when the slip value detected by said slip detecting means reaches a predetermined reference value or higher; and wherein said slip control is performed so as to reduce torque to be applied to the driven wheel temporarily by a predetermined torque portion at the time of starting said clip control and to make the slip value detected by said slip detecting means a predetermined target value after the torque to be applied to the driven wheel has been reduced temporarily.
Claim 29
Dependent Claim
76 words
A slip control system as claimed in claim 1, wherein: said slip control by said slip control means is performed such that a slip value of the wheel approaches a predetermined target value; and said control degree altering means alters said predetermined target value so as to become smaller when the outside air temperature detected by said outside air temperature sensing means is lower than the predetermined value than when the outside air temperature is higher.
Claim 30
Dependent Claim
37 words
A slip control system as claimed in claim 1, wherein said slip control by said slip control means is performed by ABS control for preventing the wheel from being locked relative to the road surface during braking.
Claim 31
Dependent Claim
71 words
A slip control system as claimed in claim 29, wherein: said slip control is started when a degree of deceleration of the wheel reaches a predetermined value or lower; and said control degree altering means alters said predetermined value so as to become smaller when the outside air temperature detected by said outside air temperature sensing means is lower than the predetermined value than when the outside air temperature is higher.
Claim 32
Dependent Claim
72 words
A slip control system as claimed in claim 30, wherein: said predetermined value is set in accordance with a road surface friction coefficient μ; and said control degree altering means alters an initial value of said road surface friction coefficient μ to a smaller value when the outside air temperature sensed by said outside air temperature sensing means is lower than said predetermined value than when the outside air temperature is higher.
Claim 33
Dependent Claim
33 words
A slip control system as claimed in claim 31, wherein said road surface coefficient μ is estimated on the basis of a degree of a body portion of acceleration of the automotive vehicle.
References Cited (Backward Citations)
US4669569A
Cited
US4552241A
Cited
JPS61275031A
Cited
US4712635A
Cited
US4971400A
Cited
US4938543A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-11-03 | 1996-05-04 | 1996-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-03 | 2000-05-04 | 2000-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-03 | 2004-05-04 | 2004-11-03 | $7700.00 | Window Closed / Lapsed |