US3749070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for internal combustion engines
Assignee: Denso Corp
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Filing: 1970-11-02
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Granted: 1973-07-31
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Expires: 1990-11-02
Abstract
Abstract A control system for internal combustion engines in which the outputs from sensors detecting the factors including the amount of air drawn into the engine or the negative pressure in the air intake manifold, the condition of acceleration, the position of the throttle valve, the temperature of the warmed-up engine, the starting signal of the engine, the angular position of rotation of the crankshaft, and the position of a specific cylinder are suitably added together to determine the amount of injected fuel and the ignition timing depending on these outputs thereby obtaining a fuel injection signal and an ignition signal. By virtue of the fact that the sensors serving the individual services are not provided in multiple and yet the ignition and fuel injection are controlled relative to each other, any desired driving conditions can be sufficiently freely established and the system can be applied to any type of engines by merely modifying the parts for the programming of various settings so that standardization of various parts can be easily realized.
Inventors
- 👤 N Ando
- 👤 K Oishi
- 👤 T Kurebayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:57
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/30; F02D41/32; F02D41/36; F02D41/365
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
445 words
A control system for internal combustion engines comprising: sensor means including at least a negative pressure sensor for detecting the negative presSure in the air intake manifold of the engine, a temperature sensor for detecting the temperature of the engine and a timing sensor for detecting predetermined rotating angular positions of the engine crankshaft; transducer means including at least a first transducer connected to said negative pressure sensor for generating an output voltage proportional to the negative pressure, a second transducer connected to said temperature detector for generating an output voltage proportional to the temperature of the engine, and a third transducer connected to said timing sensor for generating output pulses indicative of said predetermined rotating angular positions of said engine crankshaft; a setting device including a first converter means connected to at least said first and second transducer for producing a first voltage signal from at least the output voltages of said first and second transducers, said first voltage signal being indicative of an amount of the fuel to be injected into the engine and varying as a function of at least said negative pressure and said temperature of the engine, a fourth transducer connected to said third transducer for generating an output voltage proportional to the number of the output pulses of said third transducer which is proportional to the number of revolutions of the engine, and a second converter connected to said first and fourth transducers for producing a second voltage signal from the output voltages of said first and fourth transducers, said second voltage signal being indicative of an angular value to be advanced for ignition under the condition of said negative pressure and said number of revolutions of the engine; a saw-tooth wave generator connected to said third transducer for generating a train of saw-tooth voltages each synchronized with the output pulses of said third transducer, said saw-tooth voltages having trailing ends indicative of said rotating angular positions of the engine crankshaft and peak amplitudes of a predetermined constant value independent of engine speed; injection means electrically connected to said first converter and said saw-tooth generator for supplying each cylinder of the engine with a fuel whose amount is proportional to the value of said first voltage signal of said first converter and whose timing is determined by said saw-tooth voltages of said sawtooth wave generator; and ignition means connected to said saw-tooth wave generator and said second converter for generating ignition signals whose timing is determined by said saw-tooth voltages from said sawtooth generator and said second voltage signal of said second converter, and for operating ignition of the cylinders of the engine in accordance with said ignition signals.
Claim 2
Dependent Claim
445 words
A control system for internal combustion engines comprising: sensor means including at least a negative pressure sensor for detecting the negative presSure in the air intake manifold of the engine, a temperature sensor for detecting the temperature of the engine and a timing sensor for detecting predetermined rotating angular positions of the engine crankshaft; transducer means including at least a first transducer connected to said negative pressure sensor for generating an output voltage proportional to the negative pressure, a second transducer connected to said temperature detector for generating an output voltage proportional to the temperature of the engine, and a third transducer connected to said timing sensor for generating output pulses indicative of said predetermined rotating angular positions of said engine crankshaft; a setting device including a first converter means connected to at least said first and second transducer for producing a first voltage signal from at least the output voltages of said first and second transducers, said first voltage signal being indicative of an amount of the fuel to be injected into the engine and varying as a function of at least said negative pressure and said temperature of the engine, a fourth transducer connected to said third transducer for generating an output voltage proportional to the number of the output pulses of said third transducer which is proportional to the number of revolutions of the engine, and a second converter connected to said first and fourth transducers for producing a second voltage signal from the output voltages of said first and fourth transducers, said second voltage signal being indicative of an angular value to be advanced for ignition under the condition of said negative pressure and said number of revolutions of the engine; a saw-tooth wave generator connected to said third transducer for generating a train of saw-tooth voltages each synchronized with the output pulses of said third transducer, said saw-tooth voltages having trailing ends indicative of said rotating angular positions of the engine crankshaft and peak amplitudes of a predetermined constant value independent of engine speed; injection means electrically connected to said first converter and said saw-tooth generator for supplying each cylinder of the engine with a fuel whose amount is proportional to the value of said first voltage signal of said first converter and whose timing is determined by said saw-tooth voltages of said sawtooth wave generator; and ignition means connected to said saw-tooth wave generator and said second converter for generating ignition signals whose timing is determined by said saw-tooth voltages from said sawtooth generator and said second voltage signal of said second converter, and for operating ignition of the cylinders of the engine in accordance with said ignition signals.
Claim 3
Dependent Claim
188 words
A control system according to claim 1, wherein said sensor means further comprises a synchronous sensor for detecting a specific rotating angular position corresponding to a specific one of said predetermined rotating angular positions of the engine crankshaft; and said transducer means further comprises a fifth transducer connected in circuit with said synchronous sensor for generating an output signal representative of said specific rotating angular position; and wherein said ignition means comprises an ignition signal generator connected in circuit with said second converter and said saw-tooth wave generator for producing output signals by comparing said saw-tooth voltages of said saw-tooth wave generator with said second voltage signal of said second converter, a distributor connected in circuit with said fifth transducer and said ignition signal generator for distributing said output signals of said ignition signal generator to the cylinders of the engine in a predetermined order thereof, with correspondency determined with reference to said output signals of said fifth transducer, and an ignition device connected in circuit with said distributor for effecting ignition of the cylinders of the engine in accordance wiTh said ignition signals distributed from said distributor.
Claim 4
Dependent Claim
307 words
A control system according to claim 1, wherein said sensor means further comprises a throttle speed sensor for detecting the speed of movement of a throttle valve for the engine, a throttle position sensor for detecting the position of said throttle valve, and a starting sensor for detecting the starting of the engine; said transducer means further comprises sixth, seventh, and eighth transducers connected in circuit with said throttle speed sensor, said throttle position sensor and said starting sensor, respectively for producing voltage signals representative of the speed of the movement of said throttle valve, the position of said throttle valve and the starting of the engine, respectively; said setting device further comprises a fuel increasing signal generator connected in circuit with said second and eighth transducers for producing an output signal for increasing the amount of fuel supply at the starting of the engine when the temperature of the engine is below a predetermined value, a fuel injection interrupting signal generator connected in circuit with said first and second transducers for producing an output signal when the temperature of the engine is higher than a predetermined value and the negative pressure in the air intake manifold is more negative than a predetermined value corresponding to the idling state of the engine, said first converter being further connected in circuit with said fourth, sixth and seventh transducers and said fuel increasing signal generator for producing said first voltage signal modified in accordance with the output signals of the connected transducers and generator thereby controlling the amount of fuel supply, and a fuel injection amount setting means connected in circuit with said first converter and said fuel interrupting signal generator for cancelling said first voltage signal of said first converter at the presence of said output signal of said fuel injection interrupting signal thereby interrupting the fuel injection.
Claim 5
Dependent Claim
269 words
A control system according to claim 1 wherein said sensor means further comprises a synchronous sensor for detecting a specific one of said predetermined rotating angular positions of the engine crankshaft; and said transducer means further comprises a fifth transducer connected in circuit with said synchronous sensor for generating an output signal representative of said specific rotating angular position; and wherein said injection means comprises; a fuel injection signal generator connected in circuit with said first converter means and said saw-tooth wave generator for generating other saw-tooth voltages synchronized with said trailing ends of said first-mentioned saw-tooth voltages, the amplitudes of said other saw-tooth voltages being of a predetermined constant value and for producing rectangular pulses by comparing said first voltage signal of said first converter means with said other saw-tooth waves, a distributor connected in circuit with said fuel injection signal generator, said saw-tooth wave generator and said fifth transducer for generating a staircase voltage, the voltage level of which is reset to a predetermined initial value upon occurrence of the output signal of said fifth transducer and increases stepwisely upon each occurrence of the leading ends of said first-mentioned saw-tooth voltages, and for generating fuel injection signals for the respective cylinders of the engine, said fuel injection signals beginning when said staircase voltage reaches the respective stepwisely increased levels thereof and ending in synchronism with the trailing ends of said rectangular pulses; and a fuel injection device connected in circuit with said distributor for supplying each cylinder of the engine with fuel during the time that the respective one of said fuel injection signals is applied thereto.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |