US4930481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engine control apparatus
Assignee: Mitsubishi Electric Corp
•
Filing: 1989-06-14
•
Granted: 1990-06-05
•
Expires: 2009-06-14
Abstract
Abstract An engine control apparatus comprises a cylinder discrimination sensor for generating cylinder discrimination signal, a crank angle sensor for generating crank angle signal, a fuel injection valve provided in each cylinder of the engine, an ignition coil provided in correspondence to each and every cylinder, a flip-flop circuit for detecting a state of misfire in each cylinder on the basis of a state of signal of said ignition coil, and a micro-computer for receiving the cylinder discrimination signal, the crank angle signal and the output signal of the flip-flop circuit to detect that a state of misfiring has occured continuously at the same cylinder and for closing the fuel injection valve corresponding to the cylinder where the misfiring has occured.
Inventors
- 👤 Takanori Fujimoto
- 👤 Toshirou Hara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:09
CPC Classifications
F; F02; F02P; F02P17/00; F02P17/12; F02D; F02D41/00; F02D41/22; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
127 words
An engine control apparatus which comprises a cylinder discrimination sensor for generating cylinder discrimination signal; a crank angle sensor for generating crank angle signal, a fuel injection valve provided in each cylinder of the engine; an ignition coil provided in correspondence to each and every cylinder; a misfire detection means for detecting a state of misfire in each cylinder on the basis of a state of signal of said ignition coil; and a misfiring cylinder detection means for receiving the cylinder discrimination signal, the crank angle signal and the output signal of said misfire detection means to detect that the state of misfiring has occurred continuously at the same cylinder, and means for closing the fuel injection valve corresponding to the cylinder where the misfiring has occurred.
Claim 2
Dependent Claim
127 words
An engine control apparatus which comprises a cylinder discrimination sensor for generating cylinder discrimination signal; a crank angle sensor for generating crank angle signal, a fuel injection valve provided in each cylinder of the engine; an ignition coil provided in correspondence to each and every cylinder; a misfire detection means for detecting a state of misfire in each cylinder on the basis of a state of signal of said ignition coil; and a misfiring cylinder detection means for receiving the cylinder discrimination signal, the crank angle signal and the output signal of said misfire detection means to detect that the state of misfiring has occurred continuously at the same cylinder, and means for closing the fuel injection valve corresponding to the cylinder where the misfiring has occurred.
Claim 3
Dependent Claim
41 words
The engine control apparatus according to claim 1, wherein said misfire detection means produces a signal which changes regularly between a high level and a low level for each signal applied to the ignition coils when the ignition coils normally operate.
Claim 4
Dependent Claim
57 words
The engine control apparatus according to claim 2, wherein said misfiring cylinder detection means is to detect that the signal from the misfire detection means with respect to a certain ignition coil does not regularly change continuously a predetermined number of misfire, whereby an output to the fuel injection valve corresponding to the ignition coil is stopped.
Claim 5
Dependent Claim
16 words
The engine control apparatus according to claim 3, wherein said predetermined number of misfire is three.
References Cited (Backward Citations)
US4006718A
Cited
US4024850A
Cited
US4117807A
Cited
US4378771A
Cited
US4366794A
Cited
US4469071A
Cited
US4499876A
Cited
US4589401A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-04 | 1993-12-04 | 1994-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-04 | 1997-12-04 | 1998-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-04 | 2001-12-04 | 2002-06-05 | $7700.00 | Window Closed / Lapsed |