Gas engine

• US 5,012,781 A
• Filed: 07/10/1989
• Issued: 05/07/1991
• Est. Priority Date: 07/11/1988
• Status: Expired due to Term

• Current Assignee: Yamaha Hatsudoki Kabushiki Kaisha (Yamaha Corporation)
• Original Assignee: Yamaha Hatsudoki Kabushiki Kaisha (Yamaha Corporation)
• Inventors: Kamiya, Tsuyoshi, Nakayama, Hironori, Akiyama, Shigeru, Yokoyama, Yoshiharu
• Primary Examiner(s): Argenbright, Tony M.
• Application Number:
  US07/377,419
• Time in Patent Office: 666 Days
• Field of Search: 123/27 GE, 123/319, 123/350, 123/351, 123/352, 123/353, 123/525, 123/526, 123/527
• US Class Current: 123/353
• CPC Class Codes: F02D 19/02 peculiar to engines working with gaseous fuels
• CPC Class Codes: F02M 21/0212 comprising at least 3 C-Atoms, e.g. liquefied petroleum gas [LPG], propane or butane
• CPC Class Codes: F02M 21/0233 Details of actuators therefor
• CPC Class Codes: F02M 21/0239 Pressure or flow regulators therefor
• CPC Class Codes: F02M 21/029 Arrangement on engines or vehicle bodies; Conversion to gaseous fuel supply systems
• CPC Class Codes: Y02T 10/30 Use of alternative fuels, e.g. biofuels

Abstract

A small portable generator powered by a gas fueled internal combustion engine. The gas fuel supply system for the engine includes a solenoid value whose duty cycle is regulated so as to permit unthrottled operation of the engine and afford engine speed control.

Claims

1. An engine speed control for a small gas fueled engine comprising an unthrottled air passage to said engine, a readily removable container containing a pressurized source of fuel, conduit means having a readily detachable connection to said container for supplying fuel from said fuel source to said unthrottled air passage of said engine, valves means in said conduit means moveable between an opened position and a closed position, and means for cycling said valve means between its opened and closed positions with a duty cycle that varies to control the amount of fuel supplied to the engine and the speed of said engine without throttling air flow.

2. An engine speed control as set forth in claim 1 wherein the valve means is a solenoid operated valve.

3. An engine speed control as set forth in claim 1 further including pressure regulating means interposed between the source of fuel and the valve means for maintaining a substantially uniform pressure.

4. An engine speed control as set forth in claim 3 wherein the valve means is a solenoid operated valve.

5. An engine speed control as set forth in claim 4 further including means for moving the solenoid valve to a starting position in response to starting of the engine.

6. An engine speed control as set forth in claim 4 further including means for moving said valve means to its closed position when the engine is stopped.

7. An engine speed control as set forth in claim 6 further including means for moving the solenoid valve to a starting position in response to starting of the engine.

8. An engine speed control for a small gas fueled engine as set forth in claim 1 further including means interposed between the means for cycling the valve means and the engine for reducing the amount of fuel supplied to the engine under certain running conditions.

9. An engine speed control for a small gas fueled engine as set forth in claim 8 wherein the means for reducing the amount of fuel reduces the amount of fuel supplied to the engine under low speed condition.