US3859541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric control system for automobile exhaust emission control systems
Assignee: Soken Inc
•
Filing: 1973-12-19
•
Granted: 1975-01-07
•
Expires: 1993-12-19
Abstract
Abstract There is provided an electric control system comprising a computing section integrally built into a MOS large scale integrated circuit (comprising a timing signal generating circuit, a speed signal generating circuit, a vehicle speed discriminating circuit, a control program circuit, etc.) which, in accordance with the digital signals from various sensors for detecting the operating conditions of an engine, generates solenoid signals for selectively controlling solenoid valves which effect exhaust emission control actions, and a power circuit for selectively actuating the solenoid valves in accordance with the solenoid signals from the computing section.
Inventors
- 👤 Tadashi Hattori
- 👤 Hisato Wakamatsu
- 👤 Takamichi Nakase
- 👤 Shuzo Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:14
CPC Classifications
B; B60; B60K; B60K13/00; F; F02; F02D; F02D37/00; F02D37/02; F02D41/00; F02D41/24; F02D41/26
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
232 words
An electric control system for controlling soleNoid valves for actuating exhaust emission control systems comprising: a pluraliity of sensors for generating digital signals indicative of operating parameters for setting control conditions, vehicle speed detecting means whereby a squarewave voltage having a frequency variable in response to the vehicle speed is generated when the vehicle speed is higher than a predetermined value and a squarewave voltage having a predetermined frequency is generated when the vehicle speed is lower than said predetermined value, a clock circuit for generating reference timing signals, a timing signal generating circuit connected to said clock circuit to generate predetermined timing signals, a speed signal generating circuit comprising a shift register and connected to said vehicle speed detecting means and said timing signal generating circuit to generate an output signal which is shifted one stage each time said squarewave signal attains a predetermined number of cycles in a predetermined time, a vehicle speed discriminating circuit connected to said speed signal generating circuit to determine whether the vehicle speed has reached a predetermined value, a control program circuit connected to said plurality of sensors and said vehicle speed discriminating circuit to perform a logical operation on said digital signals indicative of operating parameters and the signal from said vehicle speed discriminating circuit to generate a control signal, and means connected to said control program circuit to selectively actuate said solenoid valves.
Claim 2
Dependent Claim
232 words
An electric control system for controlling soleNoid valves for actuating exhaust emission control systems comprising: a pluraliity of sensors for generating digital signals indicative of operating parameters for setting control conditions, vehicle speed detecting means whereby a squarewave voltage having a frequency variable in response to the vehicle speed is generated when the vehicle speed is higher than a predetermined value and a squarewave voltage having a predetermined frequency is generated when the vehicle speed is lower than said predetermined value, a clock circuit for generating reference timing signals, a timing signal generating circuit connected to said clock circuit to generate predetermined timing signals, a speed signal generating circuit comprising a shift register and connected to said vehicle speed detecting means and said timing signal generating circuit to generate an output signal which is shifted one stage each time said squarewave signal attains a predetermined number of cycles in a predetermined time, a vehicle speed discriminating circuit connected to said speed signal generating circuit to determine whether the vehicle speed has reached a predetermined value, a control program circuit connected to said plurality of sensors and said vehicle speed discriminating circuit to perform a logical operation on said digital signals indicative of operating parameters and the signal from said vehicle speed discriminating circuit to generate a control signal, and means connected to said control program circuit to selectively actuate said solenoid valves.
Claim 3
Dependent Claim
39 words
An electric control system according to claim 1, wherein at least said timing signal generating circuit, the speed signal generating circuit, the vehicle speed discriminating circuit and the control program circuit are integrally built into a MOS integrated circuit.
Claim 4
Dependent Claim
17 words
An electric control system according to claim 1, wherein said clock circuit comprises a piezoelectric oscillator element.
Claim 5
Dependent Claim
16 words
An electric control system according to claim 1, wherein said control program circuit comprises an ROM.
Claim 6
Dependent Claim
34 words
An electric control system according to claim 1 further comprising an emergency command switch connected to said control program circuit, and a circuit for giving priority to the signal from said emergency command switch.
Claim 7
Dependent Claim
29 words
An electric control circuit according to claim 1, wherein said control program circuit supplies a control current to said solenoid actuating means only when said solenoid valve is actuated.
References Cited (Backward Citations)
US3581839A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |