JPH02305334A - Electronic governor device - Google Patents

Abstract

PURPOSE:To prevent the excessive rotation of an engine in advance by outputting control voltage depending on the difference between a target rotational speed voltage corresponding to a target engine rotational speed to be changed within a prescribed speed range and the output voltage of a rack position detection means for the displacement of the rack. CONSTITUTION:The output of a target rotational speed setting circuit 2 is inputted to the non-reversal input terminal of an operation amplifier OP1 through an operation amplifier OP2 to be compared with the output of a rack position detection circuit 1. An actuator 27 is driven depending on the output difference between both of them to displace a rack 26a, thus changing fuel supply quantity of an electronic governor device 26. The output of the operation amplifier OP2 is inputted to a limit position setting circuit 4 through a diode D1 to output limit voltage in the rotational speed corresponding to the detection results of a rotational speed detection circuit 3. When the output of the target rotational speed setting circuit 2 is larger than that of the limit voltage setting circuit 4, the output of the target rotational speed setting circuit 2 is transmitted to the limit voltage setting circuit 4 side to stop drive of the actuator 27.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electronic governor device that adjusts the number of revolutions of an engine to a target number of revolutions by increasing or decreasing the amount of fuel supplied by changing the position of a rack.

(bl Conventional technology When controlling the engine speed using an electronic governor device, the engine speed is detected using an electromagnetic pickup, etc., and the electronic governor device is set so that the engine speed matches the target speed. Feedback control that displaces the rack position has generally been used.However, there is a slight time difference between when the fuel supply amount is changed due to the rack position displacement and when the engine speed increases or decreases. Displacing the rack based on the difference between the engine rotation speed and the target rotation speed causes a large control delay, and there is a problem in that it is not possible to follow sudden changes in the target rotation speed.

Therefore, the electronic governor is equipped with a rack position detection means for detecting the position of the rack for setting the fuel supply amount, and the rack position corresponding to the target rotation speed is measured in advance, so that the output of the rack position detection means is set to the target rotation speed. There is an electronic governor device that displaces the rack to match the value of the rack position according to. In this way, by directly controlling the position of the rack in feedback, the control delay can be reduced and rapid changes in the target rotation speed can be followed. Furthermore, when starting the engine, a larger amount of fuel is required compared to the amount of fuel supplied after starting, and after starting, it is necessary to reduce the amount of fuel supplied in order to prevent over-speeding. As described above, by setting the rack position in advance according to the target rotation speed and displacing the rack so as to realize this position, it is possible to easily control the rack position according to the target rotation speed.

(C1 Problem to be solved by the invention) However, in an electronic governor device that displaces the rack so as to realize a position corresponding to the target rotation speed, if the rack moves due to engine vibration regardless of rack position control, the rack If the limit position is not reached, it will not be controlled, and if the rack moves due to engine vibrations while the engine is rotating near its maximum speed, the amount of fuel supplied will be affected. There was a problem with over-revving due to the increased weight.

The purpose of this invention is to provide an electronic governor device that allows the restriction position of the rack to be freely set according to the engine rotation speed and prevents over-speeding due to movement of the rack due to engine vibration. It's about doing.

(Means for Solving Problem d1) The electronic governor device of the present invention is an electronic governor device that controls the rotation of an engine by changing the fuel supply amount by displacing the rack according to the control voltage. rack position detection means for outputting a control voltage corresponding to a difference between a target rotation speed voltage corresponding to a target rotation speed of the engine and an output voltage of the rack position detection means; The invention is characterized in that it is provided with output limiting means that changes the output based on a predetermined relationship in the rotational speed range.

(01 Effect In this invention, when the engine speed reaches a predetermined speed range, the rack control voltage changes based on a predetermined relationship. Therefore, when the engine speed reaches a predetermined speed range, If a relationship is set in advance such that the target rotation speed voltage is low, over-rotation will not occur even if the rack moves due to vibration or the like.

(f) Embodiment FIG. 2 is a diagram showing the configuration of an engine equipped with an electronic governor device according to an embodiment of the present invention.

Engine 22 is supplied with fuel from electronic governor device 26 . The electronic governor device 26 is equipped with an actuator 27 constituted by a linear solenoid, and the rack 26a is displaced by the drive of the actuator 27.
The amount of fuel supplied to the electronic governor device 26 changes. The rotational speed of the engine 22 changes as the fuel supply amount increases or decreases. The rotating shaft of the generator 21 is fixed to the glue/rack shaft 23 of the engine 22, and the engine 22 is used as a prime mover for the power generation a22. The rotation speed of the engine 22 is determined by the electromagnetic pickup 25 facing the ring gear of the flywheel 24.
is detected and input to the control unit 28. The engine 22 also includes a starter motor 29, and is started by rotation of the starter motor 29.

FIG. 1 is a diagram showing the configuration of a control section of the electronic governor device.

A target rotation speed setting circuit 2, which constitutes a part of the control section 28 shown in FIG. 2, outputs a drive voltage for the actuator 27 necessary to achieve a set rotation speed according to the load condition of the engine. The output of this target rotation speed setting circuit 2 is passed through an operational amplifier OP2 that constitutes a negative feedback circuit to an operational amplifier QP.
It is input to the non-inverting input terminal of I. This operational amplifier OP
The output of the rack position detection circuit 1 is input to the inverting input terminal of I. The rack position detection circuit 1 outputs a voltage according to the position of the rack 26a shown in FIG. operational amplifier OP
I outputs the difference between the output of the target rotation speed setting circuit 2 and the output of the rack position detection circuit 1 to the actuator 27.

The output terminal of the operational amplifier OP2 is connected to the limit position setting circuit 4 via a diode DI.

This limit position setting circuit 4 is composed of volumes VRI to VR3 and operational amplifiers OP3 to OP5.

The detection result of the rotational speed detection circuit 3 including the electromagnetic piston amplifier 25 shown in FIG. 2 is input to the operational amplifier OP3.

By adjusting the volume VR2, it is possible to set the rotation speed at the limit starting point shown at point A in FIG. 3, and by adjusting the volume VRI, it is possible to set the limit voltage at point B. Also, by adjusting the volume VR3, the bias value of the curve can be set in the range from point A to the rated rotation speed of 3600 rpm, and the curve can be horizontally moved up and down in Fig. 3 by changing the resistance value of the volume VR3. can.

That is, in the limit voltage setting circuit 4, a limit voltage curve in the rotation speed range from point A to the rated rotation speed of 3600 rpm shown in FIG. 3 is set, and the detection result of the rotation speed detection circuit 3 is output from the operational amplifier OP5. The limit voltage at the rotation speed corresponding to is output. When the output of the target rotation speed setting circuit 2 is larger than the output of the limit voltage setting circuit 4, the output of the target rotation speed setting circuit 2 flows from the operational amplifier ○P2 to the limit voltage setting circuit 4 via the diode D1, and The signal is no longer input to OPI, and the drive of the actuator 27 is stopped.

As described above, according to this embodiment, it is possible to limit the rack position over a predetermined rotation speed range according to the limit voltage set in the limit voltage setting circuit 4, and to prevent engine overspeed. It has the advantage of being preventable. Furthermore, since the actuator 27 is driven to achieve the limit voltage set in the limit voltage setting circuit 4, desired torque characteristics can be given to the engine.

Note that by providing a grounding resistor R1 as shown in FIG. 4, only the adjustment of the volume VR3 can be made effective. This makes it suitable for cases where the limiting voltage curve only needs to be flat within a predetermined rotation speed range, and only the bias value needs to be changed, such as electronic governors used in engines that drive generators. It is possible to realize cost reduction.

(g) Effects of the Invention According to the present invention, the rack position can be restricted based on a predetermined relationship in a predetermined rotation speed range,
This has the advantage that overspeeding of the engine can be prevented and desired torque characteristics can be provided to the engine.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of a control section of an electronic governor device according to an embodiment of the present invention, FIG. 2 is a diagram showing the configuration of an engine equipped with the electronic governor device, and FIG. 3 is a diagram showing the configuration of an engine equipped with the electronic governor device. FIG. 3 is a diagram showing the relationship between the limit voltage of the rack position and the rotation speed. Further, FIG. 4 is a diagram showing the configuration of a control section of an electronic governor device according to another embodiment of the present invention. ■-rack position detection circuit, 3-rotation speed detection circuit, 4-limiting voltage setting circuit, 26-electronic governor, 26a-rack.

Claims (1)

[Claims] (1) In an electronic governor device that controls engine rotation by changing the amount of fuel supplied by displacement of the rack according to the control voltage, a rack position detection means that outputs a voltage according to the rack position and a target rotation speed of the engine are used. output means for outputting a control voltage according to the difference between the corresponding target rotation speed voltage and the output voltage of the rack position detection means; and changing the target rotation speed voltage based on a predetermined relationship in a predetermined rotation speed range. An electronic governor device comprising: output limiting means.