US3763720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shift shock preventive device for motor vehicle fuel injection system
Assignee: Nissan Motor Co Ltd
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Filing: 1971-12-01
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Granted: 1973-10-09
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Expires: 1991-12-01
Abstract
Abstract A shift shock preventing device to be incorporated into a fuel injection system of a motor vehicle having an automatic transmission, which device comprises a differentiator electrically connected to solenoid valves hydraulically coupled to the transmission friction elements in order to generate an upshift signal when the solenoid valves are energized to effect upshift, and a transistor switching circuit connected to a computing circuit of the fuel injection system and adapted to be rendered conductive upon receipt of the upshift signal to incapacitate the computing circuit from generating an injection pulse, thereby preventing an instantaneous increase in engine speed which would otherwise invite a shift shock during upshifting. In another preferred embodiment, the transistor switching circuit is connected to the computing circuit in such a manner as to reduce the width of the injection pulse upon conduction of the switching circuit.
Inventors
- 👤 S Aono
- 👤 S Usui
- 👤 N Manaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:42
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/021; F02D41/0215; F02D41/023; F02D29/00; F02D2700/00; F02D2700/07; F16; F16H; F16H63/00; F16H63/40; F16H63/50; F16H63/502
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
217 words
In a shift shock preventive arrangement for use in a fuel injection system of a motor vehicle having an internal combustion engine including multi-cylinders, an automatic transmission, solenoid valves hydraulically coupled to elements in the automatic transmission, injection nozzles for said cylinders, injection valves associated with said nozzles, and control mechanism including, an injection valve actuating circuit connected to said injection valves, a computing circuit for producing an injection pulse signal to energize said injection valves, through said injection valve actuating circuit, to open said injection valves, a transmission control unit for delivering an energizing electrical signal to said solenoid valves to effect an upshift in the transmission, the improvement which comprises: a. a differentiator circuit electrically connected to said solenoid valves to also receive the energizing electrical signal when said solenoids are energized to effect an upshift in said transmission; and b. switching circuit means selectively connected by switch means between said differentiator circuit and said computing circuit and operable upon receipt of said energizing electrical signal at said differentiator circuit to control the extent of the injection pulse signal delivered from said actuating circuit to said injection valves, whereby said injection valves are opened only to a limited degree and thereby preventing an instantaneous increase of engine speed which produces a shift shock during upshift.
Claim 2
Dependent Claim
217 words
In a shift shock preventive arrangement for use in a fuel injection system of a motor vehicle having an internal combustion engine including multi-cylinders, an automatic transmission, solenoid valves hydraulically coupled to elements in the automatic transmission, injection nozzles for said cylinders, injection valves associated with said nozzles, and control mechanism including, an injection valve actuating circuit connected to said injection valves, a computing circuit for producing an injection pulse signal to energize said injection valves, through said injection valve actuating circuit, to open said injection valves, a transmission control unit for delivering an energizing electrical signal to said solenoid valves to effect an upshift in the transmission, the improvement which comprises: a. a differentiator circuit electrically connected to said solenoid valves to also receive the energizing electrical signal when said solenoids are energized to effect an upshift in said transmission; and b. switching circuit means selectively connected by switch means between said differentiator circuit and said computing circuit and operable upon receipt of said energizing electrical signal at said differentiator circuit to control the extent of the injection pulse signal delivered from said actuating circuit to said injection valves, whereby said injection valves are opened only to a limited degree and thereby preventing an instantaneous increase of engine speed which produces a shift shock during upshift.
Claim 3
Dependent Claim
46 words
An arrangement as defined in claim 1, wherein said switching circuit means includes a first transistor circuit and operable when connected in a first position of said switch means, to said differentiator circuit, to prevent the delivery of any injection pulse signal from said computing circuit.
Claim 4
Dependent Claim
49 words
An arrangement as defined in claim 2, wherein said first transistor circuit includes a transistor whose base is connected through a resistor to the output terminal of said differentiator circuit, the emitter of this transistor being grounded, and the collector of this transistor being connected to said computing circuit.
Claim 5
Dependent Claim
50 words
An arrangement as defined in claim 1, wherein said switching circuit means includes another transistor circuit and operable, when connected, in a second position of said switch means to said differentiator circuit, to restrict the width of an injection pulse signal delivered from said computing circuit to said injection valves.
Claim 6
Dependent Claim
67 words
An arrangement as defined in claim 4, wherein said another transistor circuit includes a transistor the base of which is connected to a terminal point, a resistor connected between said terminal point and ground and another resistor connected to said terminal and the output of said differentiator circuit, the emitter of said transistor being grounded, and the collector of said transistor being connected to said computing circuit.
Claim 7
Dependent Claim
65 words
An arrangement as defined in claim 1, wherein said differentiator circuit includes a resistor and a capacitor, said capacitor receiving the energizing electrical signal at an input terminal thereof and the output terminal of said capacitor is connected to one terminal of said resistor and to an input terminal of said switching means, and the other terminal of said resistor is connected to the ground.
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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |