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Electronic control governor

A technology of electronic control and regulator, applied in the direction of electrical control, engine control, fuel injection control, etc., can solve the problem of insufficient attenuation of actuator drive current, shortened cut-off time, inability to fully obtain and reduce actuator sliding resistance, etc. question

Inactive Publication Date: 2013-02-13
YANMAR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is a problem that when the frequency of the high-frequency vibration current is set uniformly corresponding to the actuator drive current at low engine speed, when the engine speed is gradually increased, at a certain point, the vibration frequency of the engine is different from the high-speed vibration frequency. The frequency of the high-frequency vibrating current is consistent, resulting in engine resonance
However, especially in order to improve the responsiveness of the actuator in the electronic control regulator, the cycle of the above-mentioned PWM signal is further shortened to control the actuator drive current, the attenuation of the off time with respect to the actuator drive current The speed is relatively shortened, resulting in insufficient attenuation of the actuator drive current in the cut-off time. As a result, as will be referred to in the description of Embodiment 5 described later Figure 18 As shown, the amplitude of the actuator drive current (difference between the actuator drive current and the target current) becomes small, and as described above, the effect of reducing the hysteresis of the actuator and the sliding resistance of the sliding part cannot be sufficiently obtained.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0067] according to Figure 4 ~ Figure 6 Example 1 will be described. In this embodiment, in the ECU 3, the direction to the actuator is calculated based on, for example, the actual rack position R of the fuel adjustment amount rack detected by the rack position detection unit, the target rack position Rm, the actual engine speed N, and a map. The supply amount of driving current, that is, the engine load. However, the engine load can also be calculated from the angular velocity of the rotational speed, etc., and the calculation method is not limited. Then, according to the data stored in the memory unit (not shown) of ECU3 as Figure 4 As shown in the graph (map) showing the relationship between the engine load and the amplitude of the high-frequency vibration current, the set amplitude of the high-frequency vibration current corresponding to the engine load is calculated, and the high-frequency vibration signal is set by the high-frequency vibration instruction unit 16. ,...

Embodiment 2

[0075] according to Figure 7 ~ Figure 9 Example 2 will be described. In this embodiment, in the ECU 3, the drive current to the actuator is detected based on, for example, the actual rack position R of the fuel adjustment amount rack detected by the rack position detection unit, the target rack position Rm, the actual engine speed N, and the map. The amount of supply, that is, the engine load. Then, according to the data stored in the memory unit (not shown) of ECU3 as Figure 7 Shown the relationship between the engine load and the period T of the high-frequency vibration current, calculate the appropriate setting period corresponding to the engine load, set the high-frequency vibration signal by the high-frequency vibration instruction unit 16, and from the high-frequency vibration signal The output unit 9 outputs. In the PWM signal output section, this dither signal is superimposed on the PWM signal, and the amplitude of the actuator drive current is set to an appropria...

Embodiment 3

[0084] In this embodiment, in the ECU 3, the supply amount of the driving current to the actuator is detected based on, for example, the rack position of the fuel adjustment amount rack detected by the rack position detection unit, the target rack position Rm, the actual engine speed N, and the map, etc., That is the engine load. Then, in the dithering instruction unit 16, according to the engine load, the amplitude H of the dithering current is changed to an appropriate setting amplitude in the same manner as in the first embodiment, and in the same manner as in the second embodiment. The period T of the dithering current is changed to an appropriate setting period, and a dither signal is set and output from the dither signal output unit 9 . In the PWM signal output section, this high-frequency oscillating current is superimposed on the PWM signal, and the amplitude of the actuator drive current is set to an appropriate amplitude.

[0085]In this way, the amplitude L of the ...

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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%.

Description

technical field [0001] The present invention relates to an electronic control regulator, which adjusts the fuel supply amount to the engine by driving an actuator that operates a fuel adjustment amount unit by using an actuator drive current superimposed with a high-frequency vibration current so that the engine's The rotation speed matches the target rotation speed. Background technique [0002] Conventionally, as a governor of a diesel engine, an electronically controlled governor provided in connection with a fuel injection device is known. Such an electronically controlled regulator is configured by providing a solenoid (solenoid) as an actuator for operating the fuel adjustment amount rack, and controlling the fuel supply amount to the engine by performing PWM control on the actuator, wherein , the fuel adjustment amount rack is a fuel adjustment amount unit for adjusting the fuel supply amount of the fuel injection device. Then, by superimposing a high-frequency osci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/20
Inventor 日下北斗盐见秀雄高川功
Owner YANMAR CO LTD