Exhaust timing controller for two-stroke engine

• US 6,895,908 B2
• Filed: 05/23/2003
• Issued: 05/24/2005
• Est. Priority Date: 10/12/2000
• Status: Expired due to Fees

• Current Assignee: Yamaha Motor Electronics Company Limited (Yamaha Corporation)
• Original Assignee: Kabushiki Kaisha Moric
• Inventors: Nagatsu, Yoshiyuki, Isoda, Naoya
• Primary Examiner(s): Yuen, Henry C.
• Assistant Examiner(s): Ali, Hyder
• Application Number:
  US10/249,986
• Publication Number:
  US 20030168027A1
• Time in Patent Office: 732 Days
• Field of Search: 123/65.PE, 123/406.24, 123/65.A, 123/65.P
• US Class Current: 123/65.0PE
• CPC Class Codes: F02B 2075/025 two
• CPC Class Codes: F02D 13/0249 changing the valve timing only
• CPC Class Codes: F02D 13/0284 Variable control of exhaust valves only
• CPC Class Codes: F02D 2200/1015 Engines misfires
• CPC Class Codes: F02D 2400/04 Two-stroke combustion engines with electronic control
• CPC Class Codes: F02D 35/027 using knock sensors
• CPC Class Codes: F02D 41/0097 using means for generating speed signals
• CPC Class Codes: F02D 41/045 Detection of accelerating or decelerating state detection thereof in general G01P
• CPC Class Codes: F02D 41/1498 measuring engine roughness
• CPC Class Codes: F02P 5/1504 with particular means during a transient phase, e.g. acceleration, deceleration, gear change during starting F02P5/1506
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

A method and apparatus that permits engine system control such as exhaust valve timing without the use of separate load sensors from the output of a single engine timing sensor.

Claims

1. An internal combustion engine and control therefore comprising an engine driven shaft, a timing sensor associated with said shaft for indicating the angular position of said driven shaft, an engine control system other than an ignition system for controlling an engine operation other than ignition, said other engine control system being controlled by the output of said timing sensor, said timing sensor sensing the instantaneous rotational speed of said driven shaft during the rotation of said driven shaft for less than a complete rotation and senses the rotational speed of said driven shaft for a complete revolution thereof including the measured less than complete rotation, and determines the engine basic condition from these measurements for controlling said other engine control system in response to the determined basic engine condition rather than solely engine speed.

2. An internal combustion engine and control system therefore as set forth in claim 1, wherein the engine basic condition is determined by the change in engine speed during successive intervals.

3. An internal combustion engine system control as set forth in claim 2 wherein the timing sensor comprises a single sensor.

4. An internal combustion engine system control as set forth in claim 3 wherein the other engine control system is operated solely in response to the sensed rotational speed condition without any other sensor inputs.

5. An internal combustion engine system control as set forth in claim 1 wherein the other engine control system controls a valve timing of the engine.

6. An internal combustion engine system control as set forth in 5 wherein the valve timing controlled is the exhaust valve.

7. An internal combustion engine system control as set fort in claim 6 wherein the engine operates on a two cycle principle.

8. An internal combustion engine and control system therefore as set forth in claim 7, wherein the engine basic condition is determined by the change in engine speed during successive intervals.

9. An internal combustion engine system control as set forth in claim 7 wherein the timing sensor comprises a single sensor.

10. An internal combustion engine system control as set forth in claim 9 wherein the valve timing control is done solely in response to the sensed rotational speed condition without any other sensor inputs.