JPH0472060B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electronic governor device for an internal combustion engine that controls the rotational speed of the engine by controlling the load of a fuel injection pump.

[Prior Art] In an internal combustion engine such as a diesel engine that is supplied with fuel by a fuel injection pump, the rotational speed [rpm] is controlled by controlling the position of the rack (injection amount adjusting means) of the fuel injection pump. It's on.

As an electronic governor device that controls the rotational speed by controlling the rotational speed of a fuel injection pump for an internal combustion engine, there is provided a rack operating means for operating the rack, and a deviation between the actual rotational speed and the indicated rotational speed of the internal combustion engine or the actual rotational speed of the rack. a deviation detection device for determining the deviation between the position of
and a control element that takes this integral signal as input and outputs an operation signal that determines the operation amount of the rack operation means, and the operation signal is set to an upper limit value Vx corresponding to a fully closed position of the rack and a lower limit value corresponding to a fully open position of the rack. There is a system in which the rotational speed of an internal combustion engine is controlled by controlling the position of the rack so that the system is stable within a range that changes between Vy and Vy.

By the way, in internal combustion engines, especially diesel engines, it is necessary to increase the amount of fuel supplied until the engine starts, so starting increase control is performed to increase the amount of fuel supplied when starting the engine. ing.

An electronic governor device that performs start-up increase control is described in Utility Model Application No. 55-6451. In this conventional electronic governor device, the relationship between the engine rotational speed N and the easy position of the fuel injection pump is as shown in Fig. 6. In this conventional device, the engine starts from the engine rotational speed. The state is detected. In other words, when the engine rotational speed is less than the set rotational speed Ns, which is set to be lower than the rotational speed of the starter motor, it is determined that the engine is in the starting state, and in the rotational range below the set rotational speed Ns, the engine starts increasing control, and the fuel injection pump It is fully open.

[Problems to be solved by the invention] In the conventional electronic governor device that performs starting increase control, the starting state is detected from the engine rotation speed, so the rotation speed increases as the load torque increases. When the engine speed becomes lower than the set rotational speed Ns, the starting amount increase control is activated to increase the output torque of the engine and increase the rotational speed. Therefore set rotation speed
This resulted in repeated unstable operation in the rotation range near Ns, which could lead to engine overheating.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electronic governor device for an internal combustion engine that can perform starting increase control without making the operation of the engine unstable.

[Means for Solving the Problems] As shown in FIG. 1 showing an embodiment of the present invention, the fuel injection pump that supplies fuel to the internal combustion engine 1 is placed in a fully open position and a fully closed position. a rack operating means 2 for operating an injection amount adjusting rack that is displaced between a fully closed position and a fully closed position; and a deviation detecting device for operating the rack with the rack operating means 2 to obtain a deviation necessary for automatically controlling the rotation speed. 6, 7 and
an integrator 9 that integrates the operation signal obtained from the deviation detection device and outputs an integral signal Vi; a control element 10 that receives the integral signal Vi and outputs an operation signal Vh that determines the operation amount of the rack operation means 2; The engine is equipped with a start detection circuit 11 that outputs a start detection signal Vs when it detects that the engine is in a starting state, and when the start detection signal Vs is generated, the rack is held in the fully open position and the start detection signal Vs is generated. When not, the rack position is controlled so that the system is stable within the range in which the operating signal Vh changes between the upper limit value Vx corresponding to the rack fully closed position and the lower limit value Vy corresponding to the rack fully open position. The target is an electronic governor device for an internal combustion engine that controls the rotational speed of the internal combustion engine.

In the present invention, an initial setting circuit 12 is provided which outputs an initial signal V ₀ when the speed sensor 3A is not generating an output. Start detection circuit 11
is equipped with a comparator that compares the operation signal Vh or the integral signal Vi with a reference signal corresponding to the respective lower limit value during steady operation, and when the operation signal Vh is smaller than the lower limit value Vy or the integral signal Vi is lower than the lower limit value Vy. It is configured to output the start detection signal Vs when it is smaller than '.

The control element 10 is configured such that the initial setting circuit 12 receives an initial signal.
The rack operating means 2 is configured to operate so as to forcibly move the rack to the fully closed position when outputting _V0 .

[Operation of the Invention] In the above device, the operation signal Vh changes to drive the easy operation means and control the rotational speed of the engine so as to make the predetermined deviation zero, but the engine is not operated stably. In the steady state, as shown in Figure 3, the operation signal Vh changes between the upper limit value Vx corresponding to the fully closed position of the rack and the lower limit value Vy corresponding to the fully open position of the rack. Speed control is in place. In this case, when displacing the rack toward the fully open position (increasing the amount of fuel supplied), the operation signal Vh is shifted toward the lower limit value Vy, and when displacing the rack toward the fully closed position (reducing the amount of fuel supplied). ), the operation signal Vh changes toward the upper limit value Vx, and when the deviation becomes zero, the operation signal maintains its current magnitude and the system becomes stable.

In such a control system, when the engine is in the starting state, the operation signal Vh corresponding to the integral signal Vi, which is the time integral of the deviation, is smaller than the lower limit value Vy, so the operation signal Vh reaches the lower limit value Vy. By detecting that the engine is becoming smaller, it is possible to detect that the engine is in a starting state.
Also, set the integral signal Vi to the lower limit value corresponding to the lower limit value Vy.
The starting condition can also be detected by comparing with Vy′.

In the above device, when the engine stops, the output of the speed sensor becomes zero, so the initial setting circuit 12 outputs the initial signal V ₀ . At this time, the control element 10 provides a return command signal to the drive circuit 13, and the rack returns to the fully closed position. At this time, the operation signal Vh is the lower limit value
Vy, and the integral signal Vi has become smaller than its lower limit value Vy'. Therefore, the start detection circuit 11 outputs the start detection signal Vs.

In this state, when the starting motor is driven, the initial setting circuit 12 stops outputting the initial signal _V0 , so that the initial state in which the rack is held in the fully closed position is canceled. Since the start detection signal Vs is generated until the start of the engine is completed, the rack position is maintained at the fully open position.

When starting of the engine is completed, the integral signal Vi becomes equal to or greater than its lower limit value Vy', and the operation signal Vh becomes equal to or greater than its lower limit value Vy, so that the output of the start detection signal Vs is stopped and a steady state is established. After the engine starts, the integral signal Vi will never become smaller than its lower limit value Vy′, and the operation signal Vh will never become smaller than its lower limit value Vy, so even if the engine speed decreases due to an increase in load, the engine will not start. The increase control will not work, and the engine rotation will not become unstable.

[Examples] Examples of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows the overall configuration of an embodiment of the present invention. In the figure, reference numeral 1 indicates an internal combustion engine (in this example, a diesel engine), and this internal combustion engine has an injection amount control member (an injection amount adjusting member). It is equipped with a fuel injection pump whose quantity is regulated. Reference numeral 2 denotes a rack operating means that is electrically driven to operate the fuel injection pump of the internal combustion engine 1. The rack operating means 2 may be one that operates the rack using a motor as the driving source, or one that operates the rack using an electromagnetic plunger as the driving source. It is possible to use a device that operates the .

Reference numeral 3a denotes a rotational speed sensor, such as a speed generator, for detecting the rotational speed of the internal combustion engine, and the frequency f of the output of this sensor is proportional to the rotational speed of the engine. 3
b is a frequency-voltage conversion circuit (F/V conversion circuit) that converts the output frequency f of the sensor 3a into voltage and outputs a speed detection signal Vn proportional to the rotational speed of the engine.
A speed detection device 3 is constituted by a rotation speed sensor 3a and a frequency-voltage conversion circuit 3b. The speed detection signal Vn outputted by this speed detection device changes linearly with respect to the rotational speed N of the engine as shown in FIG.

Reference numeral 4 denotes an instruction speed signal generating device, which detects the position of an accelerator operating member for setting the rotational speed of the internal combustion engine 1, and generates an instruction speed signal indicating the instruction rotational speed corresponding to the position of the accelerator operating member. Output V _op .

Reference numeral 5 denotes a rack position detection device which detects the position of the rack of the fuel injection pump and outputs a rack position signal V _L that varies linearly with respect to the rack position L as shown in FIG. This rack position detection device can be constructed of a position sensor such as a potentiometer that detects the rack position, and a signal conversion circuit that converts the output of this sensor into a signal that rises from zero at the fully closed position.

The command speed signal V _op and the speed detection signal Vn are input to the speed deviation calculation circuit 6 . This speed deviation calculation circuit 6 uses a speed detection signal Vn and an instruction speed signal.
An operation signal for constant speed control that uses V _op as input to control the deviation between the actual rotation speed and the commanded rotation speed to be within the allowable range (of course including zero deviation)
V _od = α × (Vn − V _op ) [α is a proportionality constant. ] is output.

Reference numeral 7 denotes a rack position deviation calculation circuit. This calculation circuit 7 uses the rack position detection signal V _L as input and calculates the deviation between the actual rack position and the maximum rack position (defined by the engine) to within a permissible range ( Of course, the rack position control operation signal V _Ld is outputted to maintain the rack position at zero (including zero deviation).

The operating signal V _od output by the speed deviation calculation circuit 6 and the operation signal output by the rack position deviation calculation circuit 7
V _Ld is input to the control mode switch 8. This control mode switch 8 selects the operating signal _Vod or V _Ld according to predetermined conditions and supplies it to the next stage.

In this embodiment, when the engine rotational speed N is equal to or higher than the specified rotational speed _N0 , and when the engine rotational speed N
is less than the indicated rotational speed N ₀ and the rack position is before the maximum rack position, constant speed rotation control is performed to maintain the engine rotational speed at the indicated rotational speed, and the actual rotational speed is lower than the indicated rotational speed. low,
When the rack position exceeds the maximum rack position toward the injection amount increasing side, maximum rack position control is performed to maintain the rack position at the maximum rack position. In this case, the target position of the rack in the rack position deviation calculation circuit 7 is the maximum rack position Lm at each rotational speed, and the control mode switch 8 outputs an operation signal for constant speed control according to predetermined conditions.
V _od or the maximum rack position control operation signal V _Ld is selected and output.

In this embodiment, the control mode switch 8 selects and outputs the operation signal V _od or V _Ld , and includes a changeover switch 8A, a rack position detection signal _VL , a speed detection signal Vn, an instruction speed signal _Vop , and a start detection signal Vs. and a control mode selection circuit 8B that controls a changeover switch 8A to select an operating signal V _od or V _Ld according to predetermined conditions using the input signal V od or V Ld as an input. Therefore, the operating signal V _od for constant speed control or the operating signal V _Ld for maximum rack position control is selected.

(a) The engine rotational speed N is equal to or higher than the commanded rotational speed _N0 , and the speed signal Vn outputs the commanded speed signal _Vop .

(b) When the rotational speed N is less than the commanded rotational speed _N0 , the speed detection signal Vn is smaller than the commanded speed signal _Vop , and the rack position is before the maximum rack position, the constant speed control operation signal _{Vod is} output. do.

(c) When the start detection signal Vs is input, the constant speed control operation signal V _od is output.

(d) When the speed detection signal Vn is smaller than the command speed signal V _op and the rack position exceeds the maximum rack position on the injection amount increasing side, the maximum rack position control operation signal V _Ld is output.

Operation signal output by the control mode switch 8
V _od or V _Ld is input to the integrator 9 and integrated,
The integral signal Vi output from the integrator 9 is transmitted to the control element 10
has been entered.

In this embodiment, the speed detection signal Vn is also
A differential signal V _D output from the differentiator 14 is input to the control element 10 .

The control element 11 adds or subtracts the integral signal Vi and the differential signal V _D to obtain the rotation speed N and the commanded rotation speed.
Operation signal Vh indicating the operation amount of the rack operation means 2 necessary to keep the deviation from N ₀ or the deviation between the rack position L and the maximum rack position Lm within the permissible range
Output. This operation signal Vh is input to the drive circuit 13 together with the output of an oscillator 15 that generates a sawtooth signal. In this example, the drive circuit 13 compares the operation signal _Vh with the sawtooth signal Vsw that changes between the upper limit value Vx and the lower limit value Vy as shown in FIG.
During the period when the sawtooth signal V _sw is higher than the operation signal Vh, the rectangular wave drive signal Vd is generated as shown in FIG. 3B.
Output. The duty of the drive signal Vd becomes zero when the magnitude of the operation signal Vh is equal to or greater than the upper limit value Vx, and becomes 100% when the magnitude of the operation signal Vh is equal to the lower limit value Vy. In this example, the rack operating means 2 is energized while the drive signal Vd is being generated, and the rack operating means 2 drives the rack toward the fully open position while the rack operating means 2 is energized. Therefore, the rack is driven toward the open position by an amount proportional to the amount of time the rack operating means is energized. When the power supply to the rack operating means 2 is stopped (the duty of the drive signal Vd becomes zero), the rack returns to the fully closed position by the biasing force of the return spring. The operation signal Vh changes between the upper limit value Vx and the lower limit value Vy so as to make the deviation zero,
As a result, the duty of the drive signal Vd changes,
Move the rack to a predetermined target position.

The output of the integrator 9 is also input to a start detection circuit 11. This start detection circuit 11 is an integral signal
It is equipped with a comparator that compares Vi with a reference signal of a magnitude corresponding to the lower limit value Vy' during steady operation, and
When is smaller than the reference signal, the start detection signal Vs is output. Note that the starting state may be detected by comparing the operation signal Vh with the lower limit value Vy, but if the differential signal V _D is input to the control element 10 as in this embodiment, the operation signal Vh contains many small fluctuations, it is advantageous to use the integral signal Vi to detect the starting condition.

In the above embodiment, when the period stops, the output of the speed sensor 3A disappears, so the initial setting circuit 12 outputs the initial signal _V0 . At this time, the control element 10 forces the operation signal Vh to be equal to or higher than the upper limit value Vx, makes the duty of the drive signal Vd zero, and stops energizing the rack operation means 2. This returns the rack to the fully closed position. This movement of the rack is fed back through the rack position detection device 5 to the control mode selection circuit 8B. At this time, the rack position is naturally in front of the maximum rack position, and the speed detection signal Vn is smaller than the command speed signal _Vop , so the condition (b) is satisfied. Therefore, the control mode selection circuit 8B controls the changeover switch 8A to select the constant speed control operation signal _Vod , and inputs the constant speed control operation signal _Vod to the integrator 9.

When the starter motor is driven in this state, the initial setting circuit 12 stops outputting the initial signal V ₀ , so the control element 10 cancels the initial setting operation that holds the rack in the fully closed position, and outputs the operating signal for constant speed control.
The operation signal is generated according to the integral signal Vi, which is the integral value of V _od .
Output Vh. At the start of the period, since the integral signal Vi, which is the time integral of the speed deviation, is smaller than the lower limit value Vy', the start detection circuit 11 outputs the start detection signal Vs. Therefore, the control mode selection circuit 8B controls the changeover switch 8A to select the constant speed control operation signal _Vod , and continues to input the constant speed control operation signal _Vod to the integrating circuit 9. When the start detection signal Vs is generated, the integral signal Vi is smaller than the lower limit value Vy', so the duty of the drive signal Vd is 100%. The rack is therefore held in the fully open position and the supply of fuel to the period is increased. When the start of the period is completed and the integral signal Vi becomes equal to or greater than its lower limit value, the start detection signal Vs disappears, so the start increase control is canceled and a state of constant speed rotation control is entered.

In the above embodiment, switching between constant speed rotation control and maximum easy position control is performed as follows.

In other words, the engine rotation speed N is the commanded rotation speed N ₀
If the speed signal Vn exceeds the command speed signal _Vop , the control mode switch 8 outputs the constant speed control operation signal _Vod . At this time, the integrator 9 outputs the integral signal Vi = K ₁ ∫ (Vn - V _op ) αdt (K1 is a constant), and the control element 10 inputs the integral signal Vi and the differential signal V _D to realize the actual period. Correcting fluctuations in rotational speed N to determine actual rotational speed N and commanded rotational speed
The operation amount of the easy operation means 2 necessary to make the deviation from N ₀ less than the allowable range (preferably match) is calculated, and the operation signal Vh indicates the calculated operation amount.
is supplied to the drive circuit 13.

The drive circuit 13 starts a corrective operation to drive the rack operating means 2 in the direction of suppressing speed fluctuation based on the signal output from the control element 10 when the differential signal V _D is generated, and adjusts the operating amount determined by the integral signal Vi. drive the easy operating means 2. As a result, the rack moves toward the closed position to a predetermined position (a position required to make the difference between N and N ₀ less than the allowable range), and the rotational speed N approaches the commanded speed N ₀ .

If the load increases here, the rotational speed N becomes lower than the commanded rotational speed _N0 , and the speed detection signal Vn
becomes smaller than the commanded speed signal V _op . If the load torque T at this time is lower than the maximum torque T ₀ at the commanded rotational speed N ₀ , the rack position is slightly lower than the maximum rack position, so the control mode switch 8 changes the constant speed control operation signal V _od to the rack position. Output. Therefore, the control element 10 controls the rotational speed N and the commanded rotational speed N ₀
The amount of operation necessary to bring the difference between the two and the two parts to less than the allowable range is calculated and the amount of operation is given to the drive circuit 13, and the drive circuit 12 drives the rack operating means 2 by the amount of operation. In the range where the load torque T is less than or equal to the maximum torque T ₀ at the indicated rotational speed N ₀ , these operations cause the rotational speed N for the period to reach the indicated rotational speed N ₀
is maintained.

In the present invention, an integrator 9 and a differentiator 14 are provided, and an integral-differential operation (ID operation) is performed by calculating a manipulated variable from an integral value of an operation signal and a differential value of a detected value of rotational speed. I'm letting it go. By performing the integral operation in this manner, the offset can be reduced. Also, if we add differential action,
Since the correction operation can be started before the integral signal is generated, the settling time can be shortened. Note that the differentiator 14 can also be omitted.

When the load torque T exceeds the maximum torque _T0 at the designated rotational speed _N0 , the rotational speed N becomes lower than the designated rotational speed _N0 , the speed detection signal Vn becomes smaller than the commanded speed signal _Vop , and the position of the rack becomes lower. The maximum easy position is exceeded to the injection amount increasing side. At this time, the control mode switch 8 outputs an operating signal V _Ld for maximum rack position control, and the integrator 9 outputs an integral signal Vi=∫V _Ld ·dt. The control element 10 receives this integral signal Vi as input, calculates the amount of operation of the rack operating means 2 necessary to make the deviation between the actual rack position and the maximum rack position less than the allowable range, and uses this amount of operation in the drive circuit. Give to 13. As a result, the drive circuit 13 drives the rack operating means 2 so that the deviation between the rack position and the maximum rack position is within the permissible range.

Next, referring to Figure 2, among the configurations in Figure 1,
A configuration example of the start detection circuit 11 and the control mode selection circuit 8B is shown. In the embodiment shown in FIG. 2, the start detection circuit 11 consists of a comparator CP1 and resistors R1 and R2. A constant DC voltage is applied from a power supply (not shown) to both ends of the series circuit of resistors R1 and R2, and a reference value signal indicating the lower limit value Vy' of the integral signal Vi during steady operation is obtained at both ends of the resistor R2. A reference signal indicating the integral signal Vi and the lower limit value Vy' is input to the negative phase input terminal and the positive phase input terminal of the comparator CP1, respectively, and the comparator
A start detection signal Vs is obtained at the output terminal of CP1.

The control mode selection circuit 8B includes comparators CP2 and CP
3, resistors R3 and R4, and NOR circuit NOR1,
NAND circuit NA1, NAND circuit NA2 and NA
It consists of a flip-flop circuit FF consisting of 3,
A constant DC voltage is applied to both ends of the series circuit of resistors R3 and R4. The command speed signal V _op and the speed detection signal Vn are input to the negative phase input terminal and the positive phase input terminal of the comparator CP2, respectively. Further, the rack position signal V _L is input to the positive phase input terminal of the comparator CP3, and the maximum rack position signal V _Ln obtained at both ends of the resistor R4 is input to the negative phase input terminal.

In the circuit shown in Figure 2, the integral signal Vi is the lower limit value
When it is smaller than Vy', the logic state of the output of comparator CP1 becomes "1" (start detection signal Vs is output). Since the speed detection signal Vn is smaller than the commanded speed signal V _op at the start of the period, the logic state of the output of the comparator CP2 is "0". Also, at the time of starting, the rack is initially in the front closed position, so naturally the rack position signal is
Since V _L is smaller than the maximum track position signal V _Ln ,
The logic state of the output of comparator CP3 is "0".
In this state, the logic state of the output of the NOR circuit NOR1 is "0" and the logic state of the output of the NAND circuit NA1 is "H". Therefore, the logic state of the reset terminal R of the flip-flop circuit FF becomes "1", and the logic state of the output V _F of the flip-flop circuit FF becomes "0". At this time, the selector switch 8A selects the constant speed control operation signal V _od and the integrator circuit 9
give to Therefore, when the start detection signal Vs is generated (when the logic state of the output of the comparator CP1 is "1"), the constant speed control operation signal V _od is sent to the integrating circuit 9.
is input, and the rack is maintained in the fully open position by the action described above.

The engine has started and the integral signal Vi has reached the lower limit value.
When the voltage exceeds Vy', the logic state of the output of the comparator CP1 is kept at "0" from then on. In this state, if the speed detection signal Vn is smaller than the commanded speed signal V _op , the logic state of the output of comparator CP2 becomes "0", so
The logic state of the output of the NOR circuit NOR1 becomes "1", and the logic state of the set terminal S of the flip-flop circuit FF becomes "1". At this time, the rack position is at the fully open position and exceeds the maximum rack position, so the rack position signal V _L is the maximum rack position signal V _Ln.
Since it has become larger, the logic state of the output of comparator CP3 is "1". Therefore, the logic state of the output of the NAND circuit NA1 becomes "0", and the logic state of the output terminal of the flip-flop circuit FF becomes "1". At this time, the changeover switch 8A outputs the operation signal V _Ld for controlling the maximum rack position. This causes the rack position to move back to the maximum rack position.

In this state, the engine rotation speed N is the command rotation speed
When N exceeds ₀ , the speed detection signal Vn becomes the command speed signal.
Since it becomes larger than V _op , the logic state of the output of comparator CP2 becomes "1". At this time, the NOR circuit NOR1
The logic state of the output becomes “0” and the NAND circuit
The logic state of the output of NA1 becomes "1". Therefore, the logic state of the output V _F of the blood flip-flop circuit FF becomes "0", and the changeover switch 8A supplies the constant speed control operation signal V _od to the integrator 9.

Next, when the load increases and the rack position exceeds the maximum rack position Lm, and the engine rotation speed becomes lower than the command rotation speed _N0 , the logic state of the output of comparator CP3 becomes "1". Since the logic state of the output of comparator CP2 becomes "0", the NOR circuit
The logic state of the output of NOR1 is "1", NAND circuit
The logic state of the output of NA1 becomes "0", and the logic state of the output V _F of the flip-flop circuit FF becomes "1".
become. At this time, the changeover switch 8A supplies the maximum rack position control deviation signal V _Ld to the integrator 9.

In the above embodiment, the speed detection signal Vn and the command speed signal V _op are input to the control mode selection circuit 8B and the two signals are compared to determine the magnitude relationship between the engine rotation speed and the command rotation speed. However, instead of the speed detection signal Vn and the commanded speed signal V _op , the operation signal V _od indicating the speed deviation signal is used.
The magnitude relationship between the speed detection signal and the designated rotational speed may be determined by inputting this into the control mode selection circuit 8B and determining whether the operation signal _Vod is positive or negative.

[Effects of the Invention] As described above, according to the present invention, when the magnitude of the integral signal obtained from the integrator that integrates the deviation or the operation signal output by the control element is smaller than the lower limit value during steady operation, the engine Since the start detection signal is generated when the engine is determined to be in the starting state, it is possible to prevent the start detection signal from being generated during steady engine operation and triggering the start increase control, thereby preventing the engine from becoming unstable. It has the advantage of being able to prevent

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the overall configuration of an embodiment of the present invention, FIG. 2 is a circuit diagram showing a specific configuration of the main part of FIG. 1, and FIG. 3 is a control element in the embodiment of the present invention. FIGS. 4 and 5 are diagrams showing the output signals of the drive circuit and the output signals of the drive circuit, respectively, showing the relationship between the speed detection signal and the rotational speed and the relationship between the rack position detection signal and the rack position in the embodiment of the present invention. The diagram shown in FIG. 6 is a diagram showing the relationship between rack position and rotational speed when a conventional governor is used. 1... internal combustion engine, 2... easy operation means, 3...
...Speed detection device, 4...Instruction speed signal generation device,
5...Rack position detection device, 6...Speed deviation calculation circuit, 7...Rack position deviation calculation circuit, 8...Control mode switch, 9...Integrator, 10...Control element, 11...Start detection Circuit, 12... Initial setting circuit, 13... Drive circuit.

Claims (1)

[Scope of Claims] 1. A rack operating means for operating an injection amount adjustment rack that displaces a fuel injection pump that supplies fuel to an internal combustion engine between a fully open position and a minimum position that fully closes the fuel injection pump. , a deviation detection device for calculating the deviation necessary for automatically controlling the rotational speed by operating the rack using the rack operating means, and an integrator for integrating the operation signal obtained from the deviation detection device and outputting an integral signal Vi. a control element that receives the integral signal Vi as an input and outputs an operation signal Vh that determines the operation amount of the easy operation means; and a start detection device that outputs a start detection signal when it detects that the internal combustion engine is in a start state. and an upper limit value Vx at which the operating signal Vh corresponds to the fully closed position of the rack when the start detection signal is generated and the rack is held in the fully open position when the start detection signal is not generated. An electronic governor device for an internal combustion engine that controls the rotational speed of the internal combustion engine by controlling the position of the rack so that the system is stabilized within a range varying between the rack and a lower limit value Vy corresponding to a fully open position of the rack, An initial setting circuit is provided that outputs an initial signal when the speed sensor is not generating an output, and the start detection circuit sets the magnitude of the operation signal or the integral signal to a standard corresponding to the respective lower limit value during steady operation. The control element is configured to include a comparator for comparing the signal and to output the start detection signal when the operation signal or the integral signal is smaller than a lower limit value during steady operation, and the control element is configured to output the start detection signal when the initial setting circuit receives the initial signal. An electronic governor device for an internal combustion engine, characterized in that the rack operating means is configured to operate the rack to forcibly move the rack to a fully closed position when power is being output.