Patent US4301915A successfully refreshed from Google Patents.
Patent US3890938A successfully refreshed from Google Patents.
US3890938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical fuel injection control system for internal combustion engines
Assignee: Denso Corp
•
Filing: 1973-04-19
•
Granted: 1975-06-24
•
Expires: 1993-04-19
Abstract
Abstract A system for electrically controlling the fuel injection in a multi-cylinder internal combustion engine comprising a first fuel injection starting signal generator for generating a first starting signal defining the fuel injection starting timing for a specific cylinder, a second fuel injection starting signal generator for generating second starting signals defining the fuel injection starting timing for the individual cylinders, a fuel injection duration signal generator for generating a fuel injection duration signal for the specific cylinder in response to the application of at least the first starting signal, a fuel injection ending signal generator coupled with the second starting signal generator and said duration signal generator for initiating fuel injection ending timing for the individual cylinders, the ending signals appearing after the occurrence of the starting signals and while the duration signals are activated, a fuel injection ending signal distributor for distributing said ending signals to the individual cylinders taking each ending signal corresponding to the specific cylinder as a reference, and a fuel injection starting signal distributor for distributing the second starting signals to each of the individual cylinders taking said first starting signal as a reference.
Inventors
- 👤 Kazuo Oishi
- 👤 Noriyoshi Ando
- 👤 Hiroshi Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:17
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/30; F02D41/32; F02D41/36; F02D41/365
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
300 words
A system for electrically controlling fuel injection in a multi-cylinder internal combustion engine comprising in combination: a first starting signal generator for generating a first fuel injection starting signal at a predetermined angle in each cycle of operation of a selected reference cylinder, said starting signal being generated in synchronism with the rotation of said engine, a second starting signal generator for generating a plurality of succeeding fuel injection starting signals in synchronism with the rotation of said engine, each of said succeeding fuel injection starting signals defining the time at which fuel injection to a corresponding one of the remaining cylinders in said engine is initiated, a duration signal generator connected to said first starting signal generator for generating a fuel injection duration signal, said signal having a time duration proportional to the quantity of fuel to be injected into said cylinders, an ending signal generator connected to said second starting signal generator and to said duration signal generator for generating fuel injection termination signals, each of said signals defining the time at which fuel injection to a corresponding one of the cylinders is terminated, said ending signal generator comprising means for generating a saw-tooth waveform in synchronism with said succeeding fuel injection starting signals, means responsive to said duration signal for generating a duration signal termination signal, and means responsive to said saw-tooth waveform and said duration termination signal for generating fuel injection termination signals for each of said cylinders, a fuel injection termination signal distributor connected to said ending signal generator for distributing said fuel injection termination signals successively to each of said cylinders in a predetermined order, and a starting signal distributor connected to said first and second starting signal generators for distributing said succeeding fuel injection starting signals to said cylinders in said predetermined order.
Claim 2
Independent Claim
300 words
A system for electrically controlling fuel injection in a multi-cylinder internal combustion engine comprising in combination: a first starting signal generator for generating a first fuel injection starting signal at a predetermined angle in each cycle of operation of a selected reference cylinder, said starting signal being generated in synchronism with the rotation of said engine, a second starting signal generator for generating a plurality of succeeding fuel injection starting signals in synchronism with the rotation of said engine, each of said succeeding fuel injection starting signals defining the time at which fuel injection to a corresponding one of the remaining cylinders in said engine is initiated, a duration signal generator connected to said first starting signal generator for generating a fuel injection duration signal, said signal having a time duration proportional to the quantity of fuel to be injected into said cylinders, an ending signal generator connected to said second starting signal generator and to said duration signal generator for generating fuel injection termination signals, each of said signals defining the time at which fuel injection to a corresponding one of the cylinders is terminated, said ending signal generator comprising means for generating a saw-tooth waveform in synchronism with said succeeding fuel injection starting signals, means responsive to said duration signal for generating a duration signal termination signal, and means responsive to said saw-tooth waveform and said duration termination signal for generating fuel injection termination signals for each of said cylinders, a fuel injection termination signal distributor connected to said ending signal generator for distributing said fuel injection termination signals successively to each of said cylinders in a predetermined order, and a starting signal distributor connected to said first and second starting signal generators for distributing said succeeding fuel injection starting signals to said cylinders in said predetermined order.
Claim 3
Independent Claim
330 words
A system for electrically controlling fuel injection in a multi-cylinder internal combustion engine comprising: a first starting signal generator for generating a first fuel injection starting signal at a predetermined angle in each cycle of operation of a selected reference cylinder, said starting signal being generated in synchronism with the rotation of said engine, a second starting signal generator for generating a plurality of succeeding fuel injection starting signals in synchronism with the rotation of said engine, each of said succeeding fuel injection starting signals defining the time at which fuel injection to a corresponding one of the remaining cylinders in said engine is initiated, a duration signal generator connected to said first starting signal generator for generating a fuel injection duration signal, said duration signal having a time duration which varies with at least one operating parameter of said engine, an ending signal generator connected to said second starting signal generator and said duration signal generator for generating fuel injection termination signals, each of said termination signals defining the time at which fuel injection to a corresponding one of the cylinders is terminated, said ending signal generator comprising means for generating a saw-tooth waveform in synchronism with said succeeding fuel injection starting signals, means responsive to said duration siGnal for generating a duration signal termination signal, and means responsive to said saw-tooth waveform and said fuel injection termination signal for memorizing the level of said saw-tooth waveform when said termination signal for said selected reference cylinder is generated, and means for generating said fuel injection termination signals for each of said succeeding cylinders when the saw-tooth waveform reaches said memorized level, a fuel injection termination signal distributor connected to said ending signal generator for distributing said fuel injection termination signals successively to each of said cylinders in a predetermined order, and a starting signal distributor connected to said first and second starting signal generators for distributing said succeeding fuel injection starting signals to said cylinders in said predetermined order.
Claim 4
Independent Claim
330 words
A system for electrically controlling fuel injection in a multi-cylinder internal combustion engine comprising: a first starting signal generator for generating a first fuel injection starting signal at a predetermined angle in each cycle of operation of a selected reference cylinder, said starting signal being generated in synchronism with the rotation of said engine, a second starting signal generator for generating a plurality of succeeding fuel injection starting signals in synchronism with the rotation of said engine, each of said succeeding fuel injection starting signals defining the time at which fuel injection to a corresponding one of the remaining cylinders in said engine is initiated, a duration signal generator connected to said first starting signal generator for generating a fuel injection duration signal, said duration signal having a time duration which varies with at least one operating parameter of said engine, an ending signal generator connected to said second starting signal generator and said duration signal generator for generating fuel injection termination signals, each of said termination signals defining the time at which fuel injection to a corresponding one of the cylinders is terminated, said ending signal generator comprising means for generating a saw-tooth waveform in synchronism with said succeeding fuel injection starting signals, means responsive to said duration siGnal for generating a duration signal termination signal, and means responsive to said saw-tooth waveform and said fuel injection termination signal for memorizing the level of said saw-tooth waveform when said termination signal for said selected reference cylinder is generated, and means for generating said fuel injection termination signals for each of said succeeding cylinders when the saw-tooth waveform reaches said memorized level, a fuel injection termination signal distributor connected to said ending signal generator for distributing said fuel injection termination signals successively to each of said cylinders in a predetermined order, and a starting signal distributor connected to said first and second starting signal generators for distributing said succeeding fuel injection starting signals to said cylinders in said predetermined order.
Claim 5
Dependent Claim
46 words
The system as recited in claim 1, in which said first starting signal generator comprises means for generating a signal at a predetermined position in the operating cycle of the specific cylinder, and means for subjecting said signal to wave shaping to obtain a pulse signal.
Claim 6
Dependent Claim
46 words
The system as recited in claim 1, in which said second starting signal generator comprises means for generating a signal at a predetermined position in the operating cycle of the individual cylinders, and means for subjecting said signal to wave shaping to obtain a pulse signal.
Claim 7
Dependent Claim
67 words
The system as recited in claim 1, in which said duration signal generator comprises means for generating a saw-tooth waveform having a fixed time constant in response to the application of a pulse signal input, and means for generating a rectangular waveform the duration of which ranges from the rising point of said saw-tooth waveform to a point at which said saw-tooth waveform attains a predetermined level.
Claim 8
Dependent Claim
84 words
The system as recited in claim 1, in which said ending signal distributor comprises a plurality of ending signal distributing means connected in cascade, the number of said distributing means being equal to the number of the cylinders, and said ending signal distributing means disposed in the first stage operates in response to a first input pulse signal, while the remainder of said ending signal distributing means disposed in the second and following stages operate sequentially in response to a second input pulse signal.
Claim 9
Dependent Claim
83 words
The system as recited in claim 1, in which said starting signal distributor comprises a plurality starting signal distributing means connected in cascade, the number of said distributing means being equal to the number of the cylinders, and said starting signal distributing means disposed in the first stage operates in response to a first input pulse signal, while the remainder of said starting signal distributing means disposed in the second and following stages operate sequentially in response to a second input pulse signal.
Claim 10
Dependent Claim
75 words
The system as recited in claim 1, which comprises further a first discriminator for applying to said duration signal generator a signal generated by said second starting signal generator in a low speed range of the engine which is lower than a predetermined speed, and a second discriminator for producing a ending signal for the individual cylinders on the basis of the duration signal generated by said duration signal generator in the low speed range.
Claim 11
Dependent Claim
59 words
The system as recited in claim 8, in which said first discriminator comprises a comparator for discriminating whether the speed of the engine is higher or lower than the predetermined speed, and a NAND circuit for controlling the passage of the input signal applied from said second starting signal generator depending on the result of discrimination by said comparator.
Claim 12
Dependent Claim
103 words
The system as recited in claim 8, in which said first discriminator generates a high speed range signal or a low speed range signal by discriminating whether the speed of the engine is higher or lower than the predetermined speed, and said second discriminaTor operates in such a manner that, when applied with the high speed range signal, the input signal applied from sand ending signal generator appears at the output terminal as an output signal, while when applied with the low speed range signal, the input signal applied from said duration signal generator appears at the output terminal as an output signal.
Claim 13
Dependent Claim
95 words
The system as recited in claim 8, which comprises further a third discriminator which, in response to the output signal delivered from said first starting signal generator and the output signal delivered from said fuel injection duration signal generator, selects the duration signal for the specific cylinder from the duration signal applied from said duration signal generator and detects the switching point of the duration signal so selected, and the output from said third discriminator is applied to said ending signal distributor to be utilized as a reference for the distribution of the ending signal.
Claim 14
Dependent Claim
43 words
The system as recited in claim 11, in which said third discriminator comprises a bistable multivibrator which is reset by the input signal applied from said first starting signal generator and is triggered by the input signal applied from said duration signal generator.
Claim 15
Dependent Claim
40 words
The system as recited in claim 8, which comprises a fuel injection circuit for producing a signal for the individual cylinders in response to the application of the output signals delivered from said ending signal distributor and said signal distributor.
Claim 16
Dependent Claim
52 words
The system as recited in claim 13, in which said fuel injection circuit comprises a plurality of fuel injection means each including a solenoid operated fuel injection valve associated with the corresponding cylinder a control element for energizing said fuel injection valve, and another control element for deenergizing said fuel injection valve.
Claim 17
Dependent Claim
122 words
The system as recited in claim 2, in which said first starting signal generator comprises: a first generator for generating a first signal at a predetermined position in the operating cycle of the specific cylinder, and first means connected in circuit with said first generator for producing the signal initiating the fuel injection starting timing for the specific cylinder by wave-shaping and differentiating said first signal, and said second starting signal generator comprises: a second generator for generating second signals each produced at a predetermined position in each of the operating cycles of the individual cylinders, and second means connected in circuit with said second generator for producing said starting signals for the individual cylinders by wave-shaping and differentiating said second signals.
Claim 18
Dependent Claim
57 words
The system as recited in claim 2, in which said first starting signal generator comprises means connected in circuit with said second starting signal generator for producing said signal of said first starting signal generator in synchronism with a specific one of the starting signals of said second fuel injection starting generator corresponding to the specific cylinder.
Claim 19
Dependent Claim
101 words
The system as recited in claim 2, in which said duration signal generator comprises: a saw-tooth wave generator connecting in circuit with said first starting signal generator for generating a saw-tooth waveform having a fixed gradient in response to application of the signal of said first starting signal generator, and means connected in circuit with said saw-tooth wave generator for generating said duration signal of a rectangular waveform, the duration of which ranges from the rising point of said saw-tooth waveform to a point where said saw-tooth waveform reaches a level determined by at least one operating parameter of the engine.
Claim 20
Dependent Claim
221 words
The system as recited in claim 2, in which said ending signal distributor comprises: a plurality of ending signal distributing circuits which are connected one another in a ring counter mode and whose number is equal to the number of the cylinders, a predetermined specific one of said distributing circuits having an input terminal connected in circuit to said ending signal generator for receiving the end signal for the specific cylinder and an output terminal connected in circuit to said fuel injection means, the remaining distributing circuits each having an input terminal connected in circuit to said fuel injection signal generator together with the input terminals of the other remaining distributing circuits for receiving the end signals for the individual cylinders and an output terminal connected in circuit individually to said fuel injection means, each of said distributing circuits being switched upon application of one of the ending signals to its input terminal, from a first state to a second state thereby producing at its output terminal an output signal indicative of the fuel injection ending time of the corresponding one of the cylinders only when the preceding distributing circuit is at the second state, and being switched from the second state to the first state when the succeeding distributing circuit is switched from the first state to the second state.
Claim 21
Dependent Claim
220 words
The system as recited in claim 2, in which said starting signal distributor comprises: a plurality of starting signal distributing circuits which are connected one another in a ring counter mode and whose number is equal to the number of cylinders; a predetermined specific one of said distributing circuits having an input terminal connected in circuit to said first starting signal generator for receiving the starting signal for the specific cylinder and an output terminal connected in circuit to said fuel injection means, the remaining distributing circuits each having an input terminal connected in circuit to said second starting signal generator together with the input terminals of other remaining distributing circuits for receiving the starting signals for the individual cylinders and an output terminal connected in circuit individually to said fuel injection means, each of said distributing circuits being switched upon application of one of the starting signals to its input terminal, from a first state to a second state thereby producing at its output terminal an output signal indicative of the fuel injection starting time of the corresponding one of the cylinders only when the preceding distributing circuit is at the second state, and being switched from the second state to the first state when the succeeding distributing circuit is switched from the first state to the second state.
Claim 22
Dependent Claim
220 words
The system as recited in claim 2, further comprising: a first discriminator connected in circuit between said second starting signal generator and the input terminal of said duration signal generator for applying the starting signals for the individual cylinders to said duration signal generator when the engine speed is lower than a predetermined value, whereby said duration signal generator generates the fuel injection duration signals for the individual cylinders on the basis of said starting signals applied thereto, and further generating a high speed signal when the engine speed is higher than said predetermined value, a second discriminator connected in circuit with said duration signal generator for producing signals on the basis of said fuel injection duration signals for the individual cylinders, said signals being applicable to said ending signal distributor in place of said ending signals produced by said ending signal generator, said second discriminator further connected in circuit between said fuel injection ending signal generator and said fuel injection ending signal distributor and in circuit with said first discriminator for applying said signals produced by said ending signal generator from being supplied to said ending signal distributor when said high speed signal is not applied thereto, and for permitting said ending signals to be applied to said ending signal distributor when said high Speed signal is applied thereto.
Claim 23
Dependent Claim
154 words
The system as recited in claim 20, further comprising: an r.p.m. detector connected in circuit with said second starting signal generator for producing a voltage signal proportional to the engine speed by detecting the number of said starting signals produced from said second starting signal generator, in which said first discriminator comprises: a comparator connected in circuit with said RPM detector for comparing said voltage signal with a reference voltage signal representative of said predetermined value of the engine speed, and for generating said high speed signal when said voltage signal is higher than said reference voltage signal, and generating a low speed signal when said voltage signal is lower than said reference voltage signal, a logical product circuit connected in circuit with said comparator and said second starting signal generator for applying said starting signals to said duration signal generator when said low speed signal and said starting signals are simultaneously applied thereto.
Claim 24
Dependent Claim
72 words
The system as recited in claim 20, further comprising: a third discriminator connected in circuit between said duration signal generator and said ending signal distributor for applying an ending signal for the specific cylinder to said ending signal distributor, said ending signal for the specific cylinder being produced by detecting the falling point of said duration signal for the specific cylinder selected from said duration signals applied from said duration signal generator.
References Cited (Backward Citations)
US2867200A
Cited
US2918911A
Cited
US3456628A
Cited
US3526212A
Cited
US3522794A
Cited
US3612011A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |