Electronic Control Governor

• US 20100108030A1
• Filed: 02/26/2008
• Published: 05/06/2010
• Est. Priority Date: 03/01/2007
• Status: Active Grant

• Current Assignee: Yanmar Power Technology Co., Ltd.
• Original Assignee: Yanmar Company Limited (Yanmar Holdings Co., Ltd.)
• Inventors: Kusaka, Hokuto, Takagawa, Isao, Shiomi, Hideo
• Granted Patent: US 8,176,895 B2
• Time in Patent Office: Days
• US Class Current: 123/357
• CPC Class Codes: F02D 2041/2027 Control of the current by pulse width modulation or duty cycle control
• CPC Class Codes: F02D 31/007 controlling fuel supply
• CPC Class Codes: F02D 41/1408 Dithering techniques
• CPC Class Codes: F02D 41/20 Output circuits, e.g. for controlling currents in command coils

Abstract

In an electronic control governor (1) that adjusts amount of fuel supplied to an engine so as to coincide an engine rotation speed with an target rotation speed, by driving an actuator (2) for actuating a fuel adjusting mean, due to an actuator driving current overlapped with a dither current, an amplitude or frequency of the dither current is changed, corresponding to change in supply quantity of the actuator driving current. Or, the amplitude and frequency of the dither current are changed, corresponding to change in the engine rotation speed. Alternatively, a ratio between turn-on time and turn-off time during one period of the dither current is changed, depending on velocity ratio between increased velocity and decreased velocity of the actuator driving current. Preferably, the ratio of the turn-on time to one period of the dither current is set at 20 to 40%.

Claims

1. An electronic control governor that adjusts amount of fuel supplied to an engine so as to coincide an engine rotation speed with a target rotation speed, by driving an actuator for actuating fuel adjusting means, due to an actuator driving current overlapped with a dither current,

wherein an amplitude or a frequency of the dither current is changed, corresponding to change in supply quantity of the actuator driving current.

2. The electronic control governor as set forth in claim 1, wherein the electronic control governor increases the supply quantity of the actuator driving current as an engine load is high and wherein the amplitude or the frequency of the dither current is changed, based on detection of the engine load.

3. The electronic control governor as set forth in claim 1, wherein when the supply quantity of the actuator driving current is large, the amplitude of the dither current is low, compared with the case when the supply quantity is small.

4. The electronic control governor as set forth in claim 1, wherein when the supply quantity of the actuator driving current is large, the frequency of the dither current is high, compared with the case when the supply quantity is small.

5. The electronic control governor as set forth in claim 1, wherein when the supply quantity of the actuator driving current is large, the amplitude of the dither current is low, and the frequency of the dither current is high, compared with the case when the supply quantity is small.

10. The electronic control governor as set forth in claim 2, wherein when the supply quantity of the actuator driving current is large, the amplitude of the dither current is low, compared with the case when the supply quantity is small.

11. The electronic control governor as set forth in claim 2, wherein when the supply quantity of the actuator driving current is large, the frequency of the dither current is, high, compared with the case when the supply quantity is small.

12. The electronic control governor as set forth in claim 2, wherein when the supply quantity of the actuator driving current is large, the amplitude of the dither current is low, and the frequency of the dither current is high, compared with the case when the supply quantity is small.

6. An electronic control governor that adjusts amount of fuel supplied to an engine so as to coincide an engine rotation speed with a target rotation speed, by driving an actuator for actuating fuel adjusting means, due to an actuator driving current overlapped with a dither current,

wherein an amplitude and frequency of the dither current are changed, corresponding to change in engine rotation speed.

7. The electronic control governor as set forth in claim 6, wherein when the engine rotation speed is at high rotation region, the amplitude of the dither current is low, and the frequency of the dither current is increased, compared with the case when the engine rotation speed is at low rotation region.

8. An electronic control governor that adjusts amount of fuel supplied to an engine so as to coincide an engine rotation speed with a target rotation speed, by driving an actuator for actuating fuel adjusting means, due to an actuator driving current overlapped with a dither current,

wherein a ratio between turn-on time and turn-off time during one period of the dither current is changed, corresponding to velocity ratio between increased velocity and decreased velocity of the actuator driving current.

9. The electronic control governor as set forth in claim 8, wherein the ratio of the turn-on time to one period of the dither current is set at 20 to 40%.