US4534707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrostatic vehicle control
Assignee: Caterpillar Inc
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Filing: 1984-05-14
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Granted: 1985-08-13
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Expires: 2004-05-14
Abstract
Abstract An apparatus for regulating the speed of internal combustion engine of a hydrostatic system. A fuel control means acts to control the quantity of fuel delivered to the engine responsive to the immediate hydraulic flow demanded by operation of the hydrostatic system. The speed of the engine is set to one of a plurality of discrete levels in response to the required flow being within one of a corresponding plurality of preselected ranges.
Inventors
- 👤 Randall M. Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:04
CPC Classifications
B; B60; B60W; B60W10/00; B60W10/04; B60W10/06; B60W10/10; B60W10/101; B60W10/103; B60W30/00; B60W30/18; E; E02; E02F; E02F9/00; E02F9/20; E02F9/22; E02F9/2246; F; F04; F04B; F04B49/00; F04B49/06; F04B49/065; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/46; F16H61/465; F04B2201/00; F04B2201/12; F04B2201/1201; F04B2201/1205; F16H61/42
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
117 words
An apparatus for controlling an internal combustion engine having a rack for controlling a fuel injection pump, and at least one variable displacement hydraulic pump, the apparatus comprising: first means for delivering a first signal responsive to the hydraulic flow demanded of said variable displacement hydraulic pump; control means for receiving said first signal and delivering a desired engine speed signal responsive to the magnitude of said first signal; fuel control means for receiving said desired engine speed signal and delivering a signal responsive to the magnitude of said desired engine speed signal; and, rack actuator means for receiving said signal and controlling the supply of fuel to said engine responsive to the magnitude of said signal.
Claim 2
Independent Claim
117 words
An apparatus for controlling an internal combustion engine having a rack for controlling a fuel injection pump, and at least one variable displacement hydraulic pump, the apparatus comprising: first means for delivering a first signal responsive to the hydraulic flow demanded of said variable displacement hydraulic pump; control means for receiving said first signal and delivering a desired engine speed signal responsive to the magnitude of said first signal; fuel control means for receiving said desired engine speed signal and delivering a signal responsive to the magnitude of said desired engine speed signal; and, rack actuator means for receiving said signal and controlling the supply of fuel to said engine responsive to the magnitude of said signal.
Claim 3
Dependent Claim
40 words
The apparatus, as set forth in claim 1, wherein said desired engine speed signal is controllably set to one of a plurality of preselected levels in response to said first signal being within one of a plurality of corresponding ranges.
Claim 4
Dependent Claim
38 words
The apparatus, as set forth in claim 2, wherein said desired engine speed signal is a first preselected level in response to said first signal being less than a first preselected magnitude for a preselected duration of time.
Claim 5
Dependent Claim
32 words
The apparatus, as set forth in claim 3, wherein said desired engine speed signal is a second preselected level in response to said first signal being less than a second preselected magnitude.
Claim 6
Dependent Claim
34 words
The apparatus, as set forth in claim 4, wherein said desired engine speed signal is directly proportional to said first signal in response to said first signal being greater than said second preselected magnitude.
Claim 7
Dependent Claim
23 words
The apparatus, as set forth in claim 4, wherein said second preselected level is adjustable to one of a plurality of discrete levels.
Claim 8
Dependent Claim
28 words
The apparatus, as set forth in claim 1, wherein said rack actuator means controls the quantity of fuel injected in response to the duration of said control signal.
Claim 9
Dependent Claim
73 words
The apparatus, as set forth in claim 1, including a second means for detecting the actual rotational speed of said engine and delivering a second signal responsive to said actual speed, and wherein said fuel control means receives said actual and desired engine speed signals, compares said actual and desired engine speed signals, and delivers a rack control signal in response to said actual speed signal being less than said desired speed signal.
Claim 10
Independent Claim
132 words
An apparatus for controlling an internal combustion engine having a rack for controlling a fuel injection pump, and at least one variable displacement hydraulic pump, the apparatus comprising: first means for delivering a first signal responsive to the hydraulic flow demanded of said variable displacement hydraulic pump; control means for receiving said first signal and delivering a desired engine speed signal of a first magnitude in response to said first signal being less than a first preselected magnitude for a preselected duration of time; fuel control means for receiving said desired engine speed signal and delivering a signal responsive to the magnitude of said desired engine speed signal; and rack actuator means for receiving said signal and controlling the supply of fuel to said engine responsive to the magnitude of said signal.
Claim 11
Independent Claim
132 words
An apparatus for controlling an internal combustion engine having a rack for controlling a fuel injection pump, and at least one variable displacement hydraulic pump, the apparatus comprising: first means for delivering a first signal responsive to the hydraulic flow demanded of said variable displacement hydraulic pump; control means for receiving said first signal and delivering a desired engine speed signal of a first magnitude in response to said first signal being less than a first preselected magnitude for a preselected duration of time; fuel control means for receiving said desired engine speed signal and delivering a signal responsive to the magnitude of said desired engine speed signal; and rack actuator means for receiving said signal and controlling the supply of fuel to said engine responsive to the magnitude of said signal.
Claim 12
Dependent Claim
34 words
The apparatus, as set forth in claim 9, wherein said desired engine speed signal is set at a second preselected level in response to said first signal being less than a second preselected magnitude.
Claim 13
Dependent Claim
34 words
The apparatus, as set forth in claim 10, wherein said desired engine speed signal is directly proportional to said first signal in response to said first signal being greater than said second preselected magnitude.
Claim 14
Dependent Claim
23 words
The apparatus, as set forth in claim 10, wherein said second preselected level is adjustable to one of a plurality of discrete levels.
Claim 15
Dependent Claim
73 words
The apparatus, as set forth in claim 9, including a second means for detecting the actual rotational speed of said engine and delivering a second signal responsive to said actual speed, and wherein said fuel control means receives said actual and desired engine speed signals, compares said actual and desired engine speed signals, and delivers a rack control signal in response to said actual speed signal being less than said desired speed signal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-12 | 1989-02-11 | 1989-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-12 | 1993-02-11 | 1993-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-12 | 1997-02-11 | 1997-08-13 | $7700.00 | Window Closed / Lapsed |