US4916618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle traction controller
Assignee: Motors Liquidation Co
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Filing: 1988-09-12
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Granted: 1990-04-10
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Expires: 2008-09-12
Abstract
Abstract A system and method of limiting the wheel slip of a driven wheel of a vehicle to a maximum allowable value so as to maximize the driven wheel tractive force is described. The driven wheel tractive force represented by an expression including the engine intake air flow area, a load variable function and the speed of an undriven wheel is continually monitored. The value of the monitored tractive force at the time the driven wheel slip reaches a maximum allowable value is identified and stored. When the slip exceeds the maximum allowable value, an intake air flow area is limited to a value determined to return the driven wheel tractive force to the identified tractive force at the maximum allowable wheel slip value.
Inventors
- 👤 Donald D. Stoltman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:37
CPC Classifications
B; B60; B60K; B60K28/00; B60K28/10; B60K28/16
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
227 words
A system for limiting the slip of a vehicle wheel driven by an engine having a throttle bore through which air is drawn into the engine and a rotatable throttle valve in the throttle bore for limiting the effective area of the throttle bore and therefore the mass air flow rate into the engine, the system comprising: means for determining the slip of the vehicle wheel, means effective when the determined slip is less than a predetermined maximum value for repeatedly determining a value F representing the tractive force between the wheel and the road surface in accord with a predetermined function including the effective area of the throttle bore; means for storing a value F lim equal to the last determined value of F; means effective when the determined slip is greater than the predetermined maximum value for repeatedly determining a desired effective area A DES of the throttle bore for establishing the tractive force between the wheel and the road surface at a value equal to the stored value F lim ; and means for limiting the effective area of the throttle bore to A DES while the determined slip is greater than the predetermined maximum value, whereby the tractive force between the wheel and the road surface is limited to the value F lim to limit the wheel slip at the predetermined maximum value.
Claim 2
Independent Claim
227 words
A system for limiting the slip of a vehicle wheel driven by an engine having a throttle bore through which air is drawn into the engine and a rotatable throttle valve in the throttle bore for limiting the effective area of the throttle bore and therefore the mass air flow rate into the engine, the system comprising: means for determining the slip of the vehicle wheel, means effective when the determined slip is less than a predetermined maximum value for repeatedly determining a value F representing the tractive force between the wheel and the road surface in accord with a predetermined function including the effective area of the throttle bore; means for storing a value F lim equal to the last determined value of F; means effective when the determined slip is greater than the predetermined maximum value for repeatedly determining a desired effective area A DES of the throttle bore for establishing the tractive force between the wheel and the road surface at a value equal to the stored value F lim ; and means for limiting the effective area of the throttle bore to A DES while the determined slip is greater than the predetermined maximum value, whereby the tractive force between the wheel and the road surface is limited to the value F lim to limit the wheel slip at the predetermined maximum value.
Claim 3
Independent Claim
263 words
A system for limiting the slip of a vehicle wheel driven by an engine having a throttle bore through which air is drawn into the engine and a rotatable throttle valve in the throttle bore for limiting the effective area of the throttle bore and therefore the mass air flow rate into the engine, the system comprising: means for determining the slip of the vehicle wheel; means effective when the determined slip is less than a predetermined maximum value for repeatedly determining a value F representing the tractive force between the wheel and the road surface in accord with a predetermined function defined by the expression F = A*X where A is the effective area of the throttle bore and X is a function of predetermined operating parameters; means for storing a value F lim equal to the last determined value of F; means effective when the determined slip is greater than the predetermined maximum value for repeatedly determining a desired effective area A DES of the throttle bore for establishing the tractive force between the wheel and the road surface at a value equal to the stored value F lim , the desired effective area being determined in accord with the expression A DES =l = F lim *(1/X); and means for limiting the effective area of the throttle bore to A DES while the determined slip is greater than the predetermined maximum value, whereby the tractive force between the wheel and the road surface is limited to the value F lim to limit the wheel slip at the predetermined maximum value.
Claim 4
Independent Claim
263 words
A system for limiting the slip of a vehicle wheel driven by an engine having a throttle bore through which air is drawn into the engine and a rotatable throttle valve in the throttle bore for limiting the effective area of the throttle bore and therefore the mass air flow rate into the engine, the system comprising: means for determining the slip of the vehicle wheel; means effective when the determined slip is less than a predetermined maximum value for repeatedly determining a value F representing the tractive force between the wheel and the road surface in accord with a predetermined function defined by the expression F = A*X where A is the effective area of the throttle bore and X is a function of predetermined operating parameters; means for storing a value F lim equal to the last determined value of F; means effective when the determined slip is greater than the predetermined maximum value for repeatedly determining a desired effective area A DES of the throttle bore for establishing the tractive force between the wheel and the road surface at a value equal to the stored value F lim , the desired effective area being determined in accord with the expression A DES =l = F lim *(1/X); and means for limiting the effective area of the throttle bore to A DES while the determined slip is greater than the predetermined maximum value, whereby the tractive force between the wheel and the road surface is limited to the value F lim to limit the wheel slip at the predetermined maximum value.
Claim 5
Dependent Claim
37 words
The system of claim 2 further including means for measuring the value V v of vehicle speed and wherein X is equal to f(LV)/V v where f(LV) is a function of a predetermined parameter representing engine load.
Claim 6
Independent Claim
217 words
A method of limiting the slip of a vehicle wheel driven by an engine having a throttle bore through which air is drawn into the engine and a rotatable throttle valve in the throttle bore for limiting the effective area of the throttle bore and therefore the mass air flow rate into the engine, the method comprising the steps of: determining the slip of the vehicle wheel; repeatedly determining a value F representing the tractive force between the wheel and the road surface in accord with a predetermined function including the effective area of the throttle bore when the determined slip is less than a predetermined maximum value; storing a value F lim equal to the last determined value of F; repeatedly determining a desired effective area A DES of the throttle bore for establishing the tractive force between the wheel and the road surface at a value equal to the stored value F lim when the determined slip is greater than the predetermined maximum value; and limiting the effective area of the throttle bore to A DES while the determined slip is greater than the predetermined maximum value, whereby the tractive force between the wheel and the road surface is limited to the value F lim to limit the wheel slip at the predetermined maximum value.
Claim 7
Independent Claim
217 words
A method of limiting the slip of a vehicle wheel driven by an engine having a throttle bore through which air is drawn into the engine and a rotatable throttle valve in the throttle bore for limiting the effective area of the throttle bore and therefore the mass air flow rate into the engine, the method comprising the steps of: determining the slip of the vehicle wheel; repeatedly determining a value F representing the tractive force between the wheel and the road surface in accord with a predetermined function including the effective area of the throttle bore when the determined slip is less than a predetermined maximum value; storing a value F lim equal to the last determined value of F; repeatedly determining a desired effective area A DES of the throttle bore for establishing the tractive force between the wheel and the road surface at a value equal to the stored value F lim when the determined slip is greater than the predetermined maximum value; and limiting the effective area of the throttle bore to A DES while the determined slip is greater than the predetermined maximum value, whereby the tractive force between the wheel and the road surface is limited to the value F lim to limit the wheel slip at the predetermined maximum value.
References Cited (Backward Citations)
US4823904A
Cited
US4637487A
Cited
US4664453A
Cited
US4771848A
Cited
US4721176A
Cited
US4762196A
Cited
US4768608A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-09 | 1993-10-09 | 1994-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-09 | 1997-10-09 | 1998-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-09 | 2001-10-09 | 2002-04-10 | $7700.00 | Window Closed / Lapsed |