Patent US3596507A successfully refreshed from Google Patents.
US3596507A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for detecting the injection timing of an internal combustion engine
Assignee: Toyota Central R&D Labs Inc
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Filing: 1969-08-12
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Granted: 1971-08-03
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Expires: 1989-08-12
Abstract
Abstract Apparatus for detecting the injection timing of an internal combustion engine, wherein the strain dislocation, or stress change of the injector spring, due to the lift of the needle valve of the injector when fuel is sprayed out of the injector to the ends of the cylinder, is converted to an electrical signal, said signal being used to trigger a stroboscopic lamp so as to flash synchronously with the lift of the needle valve of the injector, the stroboscopic lamp being positioned to illuminate a crank angle scale rotating with the engine crankshaft and a fixed index on the engine block, permitting observation of the crank angle, as if the engine were in static state.
Inventors
- 👤 Yujiro Oshima
- 👤 Nobuyuki Mori
- 👤 Kizo Hayakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:35
CPC Classifications
F; F02; F02M; F02M65/00; F02M65/005; F02B; F02B1/00; F02B1/02; F02B1/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
132 words
Apparatus for dynamically detecting the injection timing of an internal combustion engine, comprising a fuel injection nozzle and holder therefor, a fuel oUtlet in said nozzle surrounded by a valve seat, a valve closing said outlet when engaging said seat, fuel passage means in said nozzle and holder arranged to feed fuel against said valve to displace the valve from the seat, valve biasing means pressing said valve against the valve seat, and a strain gauge acted on by said valve biasing means so as to detect the stress of said biasing means whereby each time said valve is about to leave its seat to inject fuel into an engine, the stress in the valve biasing means changes and this change is reflected in an electrical signal provided by said strain gauge.
Claim 2
Dependent Claim
132 words
Apparatus for dynamically detecting the injection timing of an internal combustion engine, comprising a fuel injection nozzle and holder therefor, a fuel oUtlet in said nozzle surrounded by a valve seat, a valve closing said outlet when engaging said seat, fuel passage means in said nozzle and holder arranged to feed fuel against said valve to displace the valve from the seat, valve biasing means pressing said valve against the valve seat, and a strain gauge acted on by said valve biasing means so as to detect the stress of said biasing means whereby each time said valve is about to leave its seat to inject fuel into an engine, the stress in the valve biasing means changes and this change is reflected in an electrical signal provided by said strain gauge.
Claim 3
Dependent Claim
113 words
Apparatus according to claim 1, in combination with an internal combustion engine, a fuel feed source connected to said fuel passage means, a crank angle scale connected to rotate synchronously with the crank shaft of said internal combustion engine, an index mark fixed on the block of said engine opposite said scale, a stroboscopic lamp positioned to illuminate said scale and index, and electric circuit means connecting said strain gauge to said stroboscopic lamp and operative to energize the stroboscopic lamp upon the occurrence of a predetermined change is the electric signal produced by the strain gauge thereby indicating the crank angle at the time of fuel injection during operation of the engine.
Claim 4
Dependent Claim
76 words
Apparatus according to claim 1, wherein said valve biasing means comprises a plurality of members including a stationary seat and a movable seat, a coil spring seated between said seats, and a push rod, the movable seat pressing against one end of the push rod whose other end engages said valve, said seats and said push rod being disposed in axial alignment with said valve, and said strain gauge being engaged with one of said members.
Claim 5
Dependent Claim
12 words
Apparatus according to claim 3, wherein said strain gauge is a semiconductor.
Claim 6
Dependent Claim
13 words
Apparatus according to claim 3, wherein said strain gauge is a piezoelectric element.
Claim 7
Dependent Claim
31 words
Apparatus according to claim 3, wherein one of said seats for the coil spring includes a pressure sensitive device embodying a diaphragm, said strain gauge element being adhered to the diaphragm.
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) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |