Throttle valve most closed position sensing system

• US 4,359,894 A
• Filed: 01/30/1981
• Issued: 11/23/1982
• Est. Priority Date: 01/31/1980
• Status: Expired due to Term

• Current Assignee: Nissan Motor Co., Ltd.
• Original Assignee: Nissan Motor Co., Ltd.
• Inventors: Ikeura, Kenji, Sawamoto, Kunifumi
• Primary Examiner(s): Myracle, Jerry W.
• Application Number:
  US06/230,288
• Time in Patent Office: 662 Days
• Field of Search: 73/118, 73/116, 73/117.3, 364/551, 123/478
• US Class Current: 73/114.36
• CPC Class Codes: F02D 2250/16 End position calibration, i.e. calculation or measurement of actuator end positions, e.g. for throttle or its driving actuator
• CPC Class Codes: F02D 41/28 Interface circuits

Abstract

A throttle-valve most closed position sensing system is disclosed for use with an internal combustion engine. The system includes a throttle position sensor for providing a signal indicative of the degree of opening of the associated throttle-valve. A decision circuit is provided for deciding throttle-valve position as the most closed position when receiving a throttle-valve position indicative signal smaller than or equal to the smallest signal having received from the throttle position sensor.

Claims

1. A throttle-valve most closed position sensing system for use with an internal combustion engine having an induction passage provided thereinwith a throttle valve, said system comprising:

(a) a throttle position sensor for providing a signal proportional to the degree of opening of said throttle valve; and

(b) a decision circuit for deciding throttle-valve position as the most closed position when receiving, from said throttle position sensor, a signal smaller than or equal to the smallest signal having received therefrom.

2. A system according to claim 1, wherein said decision circuit is adapted to store a received signal value in place of a previously stored value and decide throttle-valve position as the most closed position when the received signal value is smaller than or equal to the previously stored value.

3. A system according to claim 1, wherein said decision circuit is adapted to decide throttle-valve position as the most closed position also when the received signal value is smaller than or equal to the previously stored value plus a predetermined value.

4. A throttle-valve most closed position sensing system for use with an internal combustion engine having an induction passage provided therein with a throttle valve, said system comprising;

(a) a throttle position sensor for providing a signal inversely proportional to the degree of opening of said throttle valve; and

(b) a decision circuit for deciding throttle-valve position as the most closed position when receiving, from said throttle position sensor, a signal larger than or equal to the largest signal having received therefrom.

5. A system according to claim 4, wherein said decision circuit is adapted to store a received signal value in place of a previously stored value and decide throttle-valve position as the most closed position when the received signal value is larger than or equal to the previously stored value.

6. A system according to claim 5, wherein said decision circuit is adapted to decide throttle-valve position as the most closed position also when the received signal value is larger than or equal to the previously stored value minus a predetermined value.