Engine electrical system

• US 5,809,974 A
• Filed: 06/02/1997
• Issued: 09/22/1998
• Est. Priority Date: 05/31/1996
• Status: Expired due to Term

• Current Assignee: Sanshin Kogyo Kabushiki Kaisha (Yamaha Corporation)
• Original Assignee: Sanshin Kogyo Kabushiki Kaisha (Yamaha Corporation)
• Inventors: Osakabe, Takayuki
• Primary Examiner(s): Argenbright, Tony M.
• Assistant Examiner(s): Vo, Hieu T.
• Application Number:
  US08/867,164
• Time in Patent Office: 477 Days
• Field of Search: 123/494, 123/73 C, 73/756, 73/866.5
• US Class Current: 123/494
• CPC Class Codes: F02B 2075/025 two
• CPC Class Codes: F02B 61/045 for marine engines
• CPC Class Codes: F02D 2400/04 Two-stroke combustion engines with electronic control
• CPC Class Codes: F02D 41/02 Circuit arrangements for generating control signals
• CPC Class Codes: F02D 41/28 Interface circuits
• CPC Class Codes: F02M 51/00 Fuel-injection apparatus characterised by being operated electrically

Abstract

An electrical system for an engine of the type utilized to power an outboard motor is disclosed. The engine has a body with a crankshaft rotating therein. At least one fuel injector supplies fuel to the engine for combustion. The electrical system includes an electronic engine control unit for controlling at least the fuel injector based upon one or more sensed conditions. The electrical system also includes at least one sensor for providing data regarding one or more conditions. Preferably, at least an air pressure and intake air temperature sensor are provided. The sensors are mounted to a portion of the engine body adjacent the crankshaft, preferably via a vibration isolated bracket, for improving sensor accuracy and reliability.

Claims

1. An engine having a body in which a crankshaft rotates, said engine positioned within a cowling of an outboard motor, said crankshaft arranged to drive a water propulsion device of said motor, said engine including at least one fuel injector providing fuel to said engine for combustion therein, said engine including an electrical system comprising at least one sensor for providing sensor data to a control unit, said control unit controlling said fuel injector based upon said sensor data, said sensor resiliently mounted to a portion of said engine body generally adjacent said crankshaft therein and within said cowling of said motor.

2. The engine in accordance with claim 1, wherein said at least one sensor comprises an intake air temperature sensor.

3. The engine in accordance with claim 1, wherein said engine is oriented so that said crankshaft is generally vertically extending.

4. The engine in accordance with claim 1, including a bracket connected to said engine with resilient mounting means, said sensor mounted to said bracket.

5. The engine in accordance with claim 4, wherein said resilient mounting means comprises at least one elastic member arranged to dampen vibrations generated by said engine.

6. The engine in accordance with claim 4, wherein said bracket is connected to said engine through at least one rubber member.

7. The engine in accordance with claim 4, wherein said at least one sensor comprises an air pressure sensor and said sensor cooperates with said bracket to form an air pressure monitoring chamber.

8. An engine having an engine body, said body having a first end and a second end, said body defining a crankcase at said second end and having at least one head member connected to said first end, said head member cooperating with said body to define at least one combustion chamber, a crankshaft rotatably positioned at least partially within said crankcase, said engine positioned within a cowling of an outboard motor, said crankshaft in driving relation with a water propulsion device of said motor, said engine further including an induction system for providing an air and fuel charge to said engine, said induction system positioned at said second end of said engine and including at least one fuel injector for providing fuel into air supplied to each combustion chamber, said engine having an electrical system including a control unit for controlling said at least one fuel injector based upon at least one sensed condition, and at least one sensor for providing data to said control unit, a bracket connected to said engine with resilient mounting means, said at least one sensor mounted to said bracket.

9. The engine in accordance with claim 8, wherein said at least one sensor is mounted near said crankshaft of said engine.

10. The engine in accordance with claim 8, wherein said bracket is connected to said engine with at least one bolt, said resilient mounting means comprising a rubber member positioned between said bolt and bracket.

11. The engine in accordance with claim 8, including at least one air intake passage leading to said crankcase, said at least one sensor mounted to said crankcase adjacent said at least one air intake passage.

12. An engine having a body in which a crankshaft rotates, at least one fuel injector providing fuel to said engine for combustion therein, said engine including an electrical system comprising at least one sensor for providing sensor data to a control unit, said control unit controlling said fuel injector based upon said sensor data, said sensor mounted to a portion of said engine body generally adjacent said crankshaft therein with a bracket connected to said engine with resilient mounting means.

13. The engine in accordance with claim 12, wherein said sensor comprises an air pressure sensor and said bracket cooperates with said sensor to form an air pressure monitoring chamber.

14. The engine in accordance with claim 12, wherein said resilient mounting means comprises at least one rubber mount member.

15. An engine having an engine body, said body having a first end and a second end, said body defining a crankcase at said second end and having at least one head member connected to said first end, said head member cooperating with said body to define at least one combustion chamber, a crankshaft rotatably positioned at least partially within said crankcase, an induction system for providing an air and fuel charge to said engine, said induction system positioned at said second end of said engine and including at least one fuel injector for providing fuel into air supplied to each combustion chamber, said engine having an electrical system including a control unit for controlling said at least one fuel injector based upon at least one sensed condition, and at least one sensor for providing data to said control unit, said at least one sensor mounted to said first end of said engine adjacent said crankcase with via a mount connected to said engine with resilient mounting means.

16. The engine in accordance with claim 15, wherein said sensor comprises an intake air pressure sensor.

17. The engine in accordance with claim 15, wherein said at least one sensor comprises an intake air temperature sensor.

18. The engine in accordance with claim 15, including at least one additional electrical component resiliently mounted to said top end of said engine.

19. The engine in accordance with claim 15, wherein a cover extends at least partially over said component and spaced therefrom to define an air space between said cover and component.

20. The engine in accordance with claim 19, wherein said component is an electrical register.