Patent US4553654A successfully refreshed from Google Patents.
US4553654A
Expired / Lapsed
US
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Installation for controlling a clutch in response to drive pedal position and engine speed
Assignee: Dr Ing HCF Porsche AG
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Filing: 1983-03-16
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Granted: 1985-11-19
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Expires: 2003-03-16
Abstract
Abstract An installation for the control of a motor vehicle drive unit which includes a reciprocating piston engine, a hydraulically actuated clutch and a transmission. A drive pedal pick-up controls the throttle valve and therewith the engine torque by way of a first characteristic curve converter while it applies a signal by way of a second characteristic curve converter a to a control apparatus, to which is also fed at the same time the engine rotational speed n. The control apparatus forms the product a·n 2 and applies the same as output signal to the electromagnetic actuating mechanism of the hydraulic clutch so that the pressure thereof and also the torque in the clutch is proportional to the product a·n 2 .
Inventors
- 👤 Gerd Bofinger
- 👤 Norbert Stelter
- 👤 Rainer Wuest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:05
CPC Classifications
B; B60; B60W; B60W10/00; B60W10/04; B60W10/06; B60W10/02; B60W30/00; B60W30/18; B60W30/18009; B60W30/18027; B60W30/1819
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
161 words
An installation for control of a motor vehicle drive unit having a reciprocating piston engine, clutch means and a transmission, comprising pick-up means for sensing engine rotational speed (n), an actuating means for operatively controlling the force acting on the clutch means, a drive pedal pick-up means for sensing a position of a drive pedal, said drive pedal controlling throttle valve position of the engine and therewith the engine torque by way of a first characteristic curve converter means, the drive pedal pick-up means applying a signal (a) dependent on the sensed drive pedal position by way of a second characteristic curve converter means to a control means, said control means being operatively connected to the rotational speed pick-up means, and said control means being operable to produce a signal for the actuating means of the clutch means which is equal to the product a·n 2 so that torque transmitted by the clutch means is substantially proportional to a·n 2 .
Claim 2
Dependent Claim
161 words
An installation for control of a motor vehicle drive unit having a reciprocating piston engine, clutch means and a transmission, comprising pick-up means for sensing engine rotational speed (n), an actuating means for operatively controlling the force acting on the clutch means, a drive pedal pick-up means for sensing a position of a drive pedal, said drive pedal controlling throttle valve position of the engine and therewith the engine torque by way of a first characteristic curve converter means, the drive pedal pick-up means applying a signal (a) dependent on the sensed drive pedal position by way of a second characteristic curve converter means to a control means, said control means being operatively connected to the rotational speed pick-up means, and said control means being operable to produce a signal for the actuating means of the clutch means which is equal to the product a·n 2 so that torque transmitted by the clutch means is substantially proportional to a·n 2 .
Claim 3
Dependent Claim
35 words
An installation according to claim 1, wherein a function a=f(φ) is stored in the second characteristic curve converter means, which is composed of an approximately parabolically rising branch and of an approximately hyperbolically decreasing branch.
Claim 4
Dependent Claim
76 words
An installation according to claim 2, wherein the signal of the engine rotational speed (n) is compared with a signal produced by a third characteristic curve converter means for a reference characteristic curve n'=f(φ), and the deviation between reference rotational speed (n') and measured rotational speed (n) is applied to the control means as further characteristic magnitude (a') so that the output signal of the control means is equal substantially to the product a·a'·n 2 .
Claim 5
Dependent Claim
40 words
An installation according to claim 3, wherein the characteristic reference curve n'=f(φ) extends substantially parallelly to the φ-axis in the lower region thereof, then rises approximately linearly and extends again substantially parallelly to the φ-axis in the upper region thereof.
Claim 6
Dependent Claim
41 words
An installation according to claim 4, wherein the characteristic curve α=f(φ) which is stored in the first characteristic curve converter means rises approximately parabolically in the lower region thereof and extends substantially parallelly to the φ-axis in the upper region thereof.
Claim 7
Dependent Claim
36 words
An installation according to claim 5, wherein an hydraulically actuated clutch means is arranged between the engine and transmission, whose static pressure (p) is controlled by the control means according to the function p=a·n 2 .
Claim 8
Dependent Claim
59 words
An installation according to claim 6, with a performance graph means in lieu of the first characteristic curve converter means, which controls the throttle valve position α in dependence on the drive pedal position φ and the engine rotational speed (n) in such a manner that with a constant drive pedal position φ, the engine driving torque remains constant.
Claim 9
Dependent Claim
17 words
An installation according to claim 7, wherein said performance graph means is a performance graph storage means.
Claim 10
Dependent Claim
17 words
An installation according to claim 7, wherein the performance graph means is a performance graph converter means.
Claim 11
Dependent Claim
78 words
An installation according to claim 1, wherein the signal of the engine rotational speed (n) is compared with a signal produced by a third characteristic curve converter means for a reference characteristic curve n'=f(φ), and in that the deviation between reference rotational speed (n') and measured rotational speed (n) is applied to the control means as further characteristic magnitude (a') so that the output signal of the control means is equal substantially to the product a·a'·n 2 .
Claim 12
Dependent Claim
40 words
An installation according to claim 10, wherein the characteristic reference curve n'=f(φ) extends substantially parallelly to the φ-axis in the lower region thereof, then rises approximately linearly and extends again substantially parallelly to the φ-axis in the upper region thereof.
Claim 13
Dependent Claim
41 words
An installation according to claim 1, wherein the characteristic curve α=f(φ) which is stored in the first characteristic curve converter means rises approximately parabolically in the lower region thereof and extends substantially parallelly to the φ-axis in the upper region thereof.
Claim 14
Dependent Claim
36 words
An installation according to claim 1, wherein an hydraulically actuated clutch means is arranged between the engine and transmission, whose static pressure (p) is controlled by the control means according to the function p=a·n 2 .
Claim 15
Dependent Claim
59 words
An installation according to claim 1, with a performance graph means in lieu of the first characteristic curve converter means, which controls the throttle valve position α in dependence on the drive pedal position φ and the engine rotational speed (n) in such a manner that with a constant drive pedal position φ, the engine driving torque remains constant.
Claim 16
Dependent Claim
17 words
An installation according to claim 14, wherein said performance graph means is a performance graph storage means.
Claim 17
Dependent Claim
17 words
An installation according to claim 14, wherein the performance graph means is a performance graph converter means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-18 | 1989-05-20 | 1989-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-18 | 1993-05-20 | 1993-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-18 | 1997-05-20 | 1997-11-19 | $7700.00 | Window Closed / Lapsed |