Patent US4893501A successfully refreshed from Google Patents.
US4893501A
Expired / Lapsed
US
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Throttle valve opening degree detecting system for controlling an internal combustion engine
Assignee: Subaru Corp
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Filing: 1988-11-16
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Granted: 1990-01-16
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Expires: 2008-11-16
Abstract
Abstract A throttle valve opening degree detecting system for controlling an internal combustion engine which generates a signal corresponding to a throttle valve opening by using a throttle sensor whose resistance changes with the throttle valve opening. The throttle sensor has a plurality of resistors connected in parallel therewith and a plurality of switches coupled to the resistors. The switches are turned on and off in response to control signals from a controller so that the output voltage characteristic of the throttle sensor changes. The controller generates the control signals in accordance with the engine speed. Thus, the output voltage characteristic of the throttle sensor has a good resolution even at the range of low engine speed and small throttle valve opening.
Inventors
- 👤 Yoshiyuki Sogawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:27
CPC Classifications
F; F02; F02D; F02D11/00; F02D11/06; F02D11/10; F02D11/105; F02D11/106; F02D41/00; F02D41/02; F02D41/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
128 words
A throttle valve opening degree detecting system for controlling an internal combustion engine comprising: a throttle sensor for detecting a throttle valve opening degree; a plurality of switch means; a plurality of resistors each coupled to a corresponding one of said plurality of switch means, said plurality of resistors being adapted to be connected in parallel with said throttle sensor; and control means for supplying a control signal to turn on and off said plurality of switch means; whereby said plurality of switch means are selectively turned on and off in response to said control signal from said control means to variably set the output voltage characteristic of said throttle sensor; said control means changes the on/off state of said control signal in accordance with the engine speed.
Claim 2
Dependent Claim
128 words
A throttle valve opening degree detecting system for controlling an internal combustion engine comprising: a throttle sensor for detecting a throttle valve opening degree; a plurality of switch means; a plurality of resistors each coupled to a corresponding one of said plurality of switch means, said plurality of resistors being adapted to be connected in parallel with said throttle sensor; and control means for supplying a control signal to turn on and off said plurality of switch means; whereby said plurality of switch means are selectively turned on and off in response to said control signal from said control means to variably set the output voltage characteristic of said throttle sensor; said control means changes the on/off state of said control signal in accordance with the engine speed.
Claim 3
Dependent Claim
134 words
A throttle valve opening degree detecting system for controlling an internal combustion engine comprising: a throttle sensor for detecting a throttle valve opening degree; a plurality of switch means; a plurality of resistors each coupled to a corresponding one of said plurality of switch means, said plurality of resistors being adapted to be connected in parallel with said throttle sensor; and control means for supplying a control signal to turn on and off said plurality of switch means; whereby said plurality of switch means are selectively turned on and off in response to said control signal from said control means to variably set the output voltage characteristic of said throttle sensor; said control means changes the on/off state of said control signal in accordance with a combination of throttle valve opening and engine speed.
Claim 4
Dependent Claim
134 words
A throttle valve opening degree detecting system for controlling an internal combustion engine comprising: a throttle sensor for detecting a throttle valve opening degree; a plurality of switch means; a plurality of resistors each coupled to a corresponding one of said plurality of switch means, said plurality of resistors being adapted to be connected in parallel with said throttle sensor; and control means for supplying a control signal to turn on and off said plurality of switch means; whereby said plurality of switch means are selectively turned on and off in response to said control signal from said control means to variably set the output voltage characteristic of said throttle sensor; said control means changes the on/off state of said control signal in accordance with a combination of throttle valve opening and engine speed.
References Cited (Backward Citations)
US4693111A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-15 | 1993-07-17 | 1994-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-15 | 1997-07-17 | 1998-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-15 | 2001-07-17 | 2002-01-16 | $7700.00 | Window Closed / Lapsed |