US3707892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmission controlled throttle for internal combustion engine
Assignee: Mazda Motor Corp
•
Filing: 1970-08-11
•
Granted: 1973-01-02
•
Expires: 1990-08-11
Abstract
Abstract A fuel supply system for an internal combustion engine utilizing an automatic transmission including a torque converter and a gear train has a carburetor with an inlet passage and a throttle valve therein. A sensing member is in a first position when the gear train is in a neutral position and a second position when the gear train is in a drive position. A throttle valve control slightly opens or closes the throttle valve in response to the sensing member. The throttle valve control operates to slightly open the throttle valve to hold the idling speed of the engine to a predetermined value when the gear train is in the drive position, thereby preventing the engine speed from decreasing due to the load.
Inventors
- 👤 T Kuroda
- 👤 Y Tatsutomi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:53
CPC Classifications
F; F02; F02D; F02D9/00; F02D29/00; F02D2700/00; F02D2700/02; F02D2700/0217; F02D2700/0225; F02D2700/0228; F02D2700/023; F02D2700/0241; F02D2700/07
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
167 words
A fuel supply system for an internAl combustion engine having an automatic transmission comprising: an air and fuel supply means for supplying a combustion mixture to the internal combustion engine including an inlet passage to the engine and a throttle valve therein; sensing means operatively connected to the automatic transmission for generating a first signal when the automatic transmission is in a neutral position and a second signal when the automatic transmission is in a drive position; and throttle valve control means operatively connected to said sensing means and responsive to the signals of the sensing means for positioning the throttle valve in the inlet passage in a relatively open position when the automatic transmission is in the drive position in response to said second signal and in a relatively closed position when the automatic transmission is in a neutral position in response to said first signal whereby the engine speed will be maintained when the engine is placed under the drive load by the automatic transmission.
Claim 2
Dependent Claim
167 words
A fuel supply system for an internAl combustion engine having an automatic transmission comprising: an air and fuel supply means for supplying a combustion mixture to the internal combustion engine including an inlet passage to the engine and a throttle valve therein; sensing means operatively connected to the automatic transmission for generating a first signal when the automatic transmission is in a neutral position and a second signal when the automatic transmission is in a drive position; and throttle valve control means operatively connected to said sensing means and responsive to the signals of the sensing means for positioning the throttle valve in the inlet passage in a relatively open position when the automatic transmission is in the drive position in response to said second signal and in a relatively closed position when the automatic transmission is in a neutral position in response to said first signal whereby the engine speed will be maintained when the engine is placed under the drive load by the automatic transmission.
Claim 3
Dependent Claim
169 words
The fuel supply system as set forth in claim 1, wherein the sensing means includes a two-position switch which opens upon shifting the automatic transmission from the neutral position to the drive position, the throttle valve control means including a diaphragm device having a conduit communicating with the inlet passage and a solenoid valve means connected in said conduit and being operatively connected to said switch for opening the conduit by closing the two-position switch, whereby the diaphragm device operates to close the throttle valve to maintain the idling speed of the engine to a predetermined value when the automatic transmission moves to the neutral position, and further including biasing means opposing said vacuum operated diaphragm means to move said throttle valve control means to a predetermined open position to open the throttle valve so as to prevent the engine speed from lowering due to the transmission load when the automatic transmission is shifted from neutral to a drive position, said conduit being blocked by said solenoid valve means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |