JPS6229744A - Electronic governor for internal-combustion engine - Google Patents

Abstract

PURPOSE:To perform start incremental control without causing unstable engine operation by providing a start detection circuit for producing a start detection signal when the magnitude of integrated signal or operating signal is lower than the lower limit under normal operation. CONSTITUTION:Initial setting circuit 12 for producing an initial signal Vo when a speed sensor 3A is not producing an output is provided. Start detection circuit 11 will produce a start detection signal Vs when the operating signal Vh is lower than the lower limit Vy or the integrated signal Vi is lower than the lower limit Vy. While control element 10 will function the rack operating means 2 such that the rack is forcibly moved to the full-open position when the initial setting circuit 12 is producing the initial signal Vo. Consequently, the start incremental control can be executed without causing unstable engine operation.

Description

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

[Prior art] Diesel IjlII! In an internal combustion engine such as I that is supplied with fuel by a fuel injection pump, the rotational speed [rpmJ] is controlled by controlling the position of the rack (injection adjustment means) of the fuel injection pump.

As an electronic governor device that controls the rack position and rotation speed of a fuel injection pump for an internal combustion engine, there is a rack operation means for operating the rack, and a deviation between the actual rotation speed and the indicated rotation speed of the internal combustion engine or the actual rack rotation speed. a deviation detection device for determining the deviation between the position of The system is stabilized within the range in which the operation signal changes between the upper limit value X corresponding to the fully open position of the rack and the lower limit value Vy corresponding to the fully open position of the rack. There are some engines in which the rotational speed of an internal combustion engine is controlled by controlling the position of the rack.

By the way, in internal combustion engines, especially diesel engines, it is necessary to increase the fuel supply m until the engine starts, so starting increase control is performed to avoid increasing the fuel supply level when starting the engine. ing.

An electronic governor device that performs start-up increase control is described in Utility Model Application No. 6451, 1983. In this conventional electronic governor device, the engine rotational speed JP
The relationship between N and the rack position of the fuel injection pump is as shown in Figure 6, and in this conventional device, the engine rotational speed is
It is detected from the start that the i-sensor is in the starting state. In other words, it is determined that the engine is in the starting state when the rotational speed of the engine is less than or equal to the set rotational speed Ns, which is set to be lower than the rotational speed of the starter motor, and the engine is started in the rotational range below the set rotational speed NS.
.

Increase control is performed to keep the fuel injection pump fully open.

Problem 1 to be Solved by the Invention In the conventional electronic governor device that performs start increase control, the starting state was 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 engine start increase control is activated to increase the output torque of the engine and increase the rotational speed. As a result, unstable operation is repeated in the rotation range near the set rotation speed NS, which may lead to engine overheating or the like.

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 destabilizing the operation of the engine.

[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 in a fully open position. 2. Rack operating means for operating the injection amount adjustment rack that is displaced between the fully open position and the fully open position; , a deviation detection device 6.7 which calculates the deviation necessary for automatically controlling the rotation speed by operating the rack using the rack operator v; U2, and an integral signal Vi which integrates the operation signal obtained from the deviation detection device. The integrator 9 outputs the integral signal ■i
a control element 10 that receives as input an operation signal Vh that determines the amount of operation of the rack operation means 2, and a start detection circuit 11 that outputs a start detection signal Vs when it detects that the internal combustion engine is in the start state, When the start detection signal Vs is generated, the rack is held at the fully open position, and when the start detection signal Vs is not generated, the operation signal Vh is set to the upper limit value Vx corresponding to the fully open position of the rack, which corresponds to the fully open position of the rack. This is intended for 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 lower limit value Vy and the lower limit value Vy.

In the present invention, an initial setting circuit 12 is provided which outputs an initial signal VO when the speed sensor 3A is not generating an output. The start detection circuit 11 includes a comparator that compares the operation signal Vh or the integral signal ■i with a reference signal corresponding to the respective lower limit values during steady operation, and when the operation signal Vh is smaller than the lower limit value Vy or the integral signal v1 is configured to output a start detection signal VS when is smaller than its lower limit value Vy°.

The control element 10 is configured to operate the rack operating means 2 to forcibly move the rack to the fully open position when the initial setting circuit 12 is outputting the initial signal VO.

[Operation of the invention] In the above device, the operating signal Vh changes to drive the rack operating 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 FIG.
The rotational speed is controlled while h changes between an upper limit value Vx corresponding to the fully open position of the rack and a lower limit value y corresponding to the fully open position of the rack. In this case, when displacing the rack toward the fully open position (increasing the amount of fuel supplied), the operation signal Vh is moved toward the lower limit value Vy, and the rack is displaced toward the fully open position (reducing the amount of fuel supplied). When the system skips), the operation signal yh 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 vs function is in the starting state, the operation signal yh corresponding to the integral signal Vi, which is the time integral of the deviation, is smaller than the lower limit value ■v, so
By detecting that the operation signal Vh is smaller than the lower limit value Vy, it is possible to detect that the engine is in a starting state. The starting state can also be detected by comparing the integral signal ■i with the lower limit value ■y° corresponding to the lower limit value Vv.

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 VO. At this time, the control element 10 gives a return command signal to the drive circuit 13, and the rack returns to the fully open position. At this time, the operation signal Vh is smaller than the lower limit value Vy, and the integral signal Vi is smaller than the lower limit value Vy°. Therefore, the start detection circuit 11 outputs the start detection signal ys.

In this state, when the starting motor is driven, the initial setting circuit 12 stops outputting the initial signal (2)0, so that the initial state in which the rack is held at the fully open 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 full rotation d.

When the engine starts, the integral signal ■i reaches its lower limit value■
Since the operating signal Vh exceeds the F limit value ■y, the output of the start detection signal VS is stopped and a steady state is established. After the engine starts, the integral signal v1 will never become smaller than its lower limit value v■°, and the operating signal vb will never become smaller than its F limit value Vy, so the rotation speed will decrease due to an increase in load. Even if the starting power increase control is not activated, the engine rotation will not become unstable.

[Example] The present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows the overall configuration of an embodiment of the present invention.

Therefore, in the figure, 1 is an internal combustion engine (in this example, a diesel engine), and this internal combustion engine is equipped with a rack (injection 11).
It is equipped with a fuel injection pump whose injection amount is adjusted by a J ffi 1 section member). 2 is a rack operating means that is electrically driven to operate the fuel injection pump of the internal combustion engine 1;
As the rack operating means 2, one that operates the rack using a motor as a driving source, or one that operates the rack using an electromagnetic plunger as a driving source, etc. can be used.

3a is a rotation speed sensor that detects the rotation speed of the internal combustion engine;
For example, in a speed generator, the frequency f of the output of this sensor is proportional to the rotational speed of the engine. 3b is a frequency-voltage conversion circuit (F/V) that converts the output frequency f of the sensor 3a into a voltage and outputs a speed detection signal Vn proportional to the rotational speed of the engine.
(conversion circuit), a speed detection device 3 is constituted by a rotational speed sensor 3a and a frequency-voltage conversion circuit 3b. The speed detection signal ■n 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. Outputs VnO.

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 1 which changes linearly with respect to the rack position IL as shown in FIG. This rack position detection device a can be constructed of, for example, 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 open position.

The commanded speed signal ①no and the speed detection signal Vn are input to the speed deviation calculation circuit 6. This speed deviation calculation circuit 6 inputs the speed detection signal vn and the commanded speed signal Vno, and performs &lI tin so that the deviation between the actual rotational speed and the commanded rotational speed is within the permissible range (of course including zero deviation). Constant speed control operation signal Vnd=αx (■n −
Vno) [(Z is a proportionality constant. Outputs 1.

Reference numeral 7 denotes a rack position deviation calculation circuit, and this calculation circuit 7 inputs the rack position detection signal VL and calculates the deviation between the actual rack position and the maximum rack position @ (defined by the engine) below the allowable range ( A rack position control operation signal VLd is output for controlling the rack position to maintain the rack position (including zero deviation, of course).

The operating signal ■nd output from the speed deviation calculation circuit 6 and the operation signal VLd output from the rack position deviation calculation circuit 7 are input to the control mode switch 8. This control mode switch 8 selects an operating signal Vnd or VLd according to predetermined conditions.
is selected and supplied to the next stage.

In this embodiment, when the engine rotational speed N is equal to or higher than the specified rotational speed N0, when the rotational speed 11N is less than the specified rotational speed N0 and the rack position is before the maximum rack position, the rotation speed of 1lI11 is Constant speed rotation control is performed to keep the speed at the indicated rotation speed, and when the actual rotation speed is lower than the indicated rotation speed and the rack position exceeds the maximum rack position on the injection amount increasing side, the rack position is changed. Maximum rack position control shall be performed to maintain the rack at the maximum rack position. In this case, the target position of the rack in the rack position 1; I11wJ operation signal Vnd or maximum rack position control operation signal ■Ld is selected and output.

In this embodiment, the control mode switch 8 receives the operating signal Vnd.
or a selector switch 8A that selects and outputs VLd;
A control mode in which the rack position detection signal VL, the speed detection signal n, the command speed signal vno, and the start detection signal VS are input to control the changeover switch 88 to select the operation signal Vnd or VLd according to predetermined conditions. The control mode switch 8 selects the constant speed control operation signal Vnd or the maximum rack position control operation signal VLd according to the following conditions.

(a) When the rotational speed 11N of the engine is equal to or higher than the commanded rotational speed N0 and the speed signal ■n is equal to or higher than the commanded speed signal Vno, a constant speed control operation signal Vnd is output.

(b) When the rotational speed N is less than the commanded rotational speed No, the speed detection signal yn is smaller than the commanded speed signal vno, and the rack position is before the maximum rack position, the constant speed control operation signal Vnd is output.

(C) When the start detection signal VS is input, the constant speed control operation signal Vnd is output.

(d) When the speed detection signal ■n is smaller than the commanded speed signal @Vno and the rack position exceeds the maximum rack position on the injection increasing side, the operation signal VLd for controlling the maximum rack position is output.

The operation signal Vnd or VLd output from the control mode switch 8 is input to an integrator 9 and integrated, and the integrator 9 outputs an integral signal vi1. It is input to the tll control element 10.

In this embodiment, the speed detection signal ■n is also input to the differentiator 14 and differentiated, and this differentiator 14 outputs a differential signal V
D is input to the control element 10.

The control element 11 adds or subtracts the integral signal Vi and the differential signal VD to add or subtract the integral signal Vi and the differential signal VD to keep the deviation between the rotational speed N and the indicated rotational speed NO or the deviation between the rack position ill and the maximum rack position 1m within a permissible range. An operation signal Vh indicating the amount of operation of the rack operation means 2 is output. This operation signal Vh is applied to the drive circuit 1 along with the output of the oscillator 15 that generates the sawtooth signal.
3 is entered. 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 During the above period, a rectangular waveform drive signal Vd is output as shown in FIG. 3B. 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 y. 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 during the period when the rack operating means 2 is energized. Therefore, the rack is driven toward the open position by a length of time proportional to the energization time to the rack operating means. 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 open 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, thereby changing the duty of the drive signal Vd and moving 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 includes a comparator that compares the integral signal Vi with a reference signal of a magnitude corresponding to the lower limit value vy° during steady operation, and outputs a start detection signal Vs when the integral signal V+ is smaller than a single signal. 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 VD is input to the control element 10 as in this embodiment, the operation signal Since Vh contains many small fluctuations, it is advantageous to detect the starting condition using the integral signal Vi.

In the above embodiment, when the engine stops, the output of the speed sensor 3A disappears, so the initial setting circuit 12 outputs the initial signal VO. At this time, the control element 10 outputs an operation signal Vh.
is forced to exceed the upper limit value VX, the duty of the drive signal Vd is made zero, and the power supply to the rack operating means 2 is stopped. This returns the rack to the fully open position. This movement of the rack is fed back to the control mode selection circuit 8B through the rack position detection device 5. At this time, the rack position is naturally in front of the maximum rack position, and the speed detection signal V11 is smaller than the command speed signal Vno, so (b
) is satisfied. Therefore, the control mode selection circuit 8
B controls the changeover switch 88 to select the constant speed control operation signal Vnd, and inputs the constant speed control operation signal Vnd to the integrator 9.

When the starter motor is driven in this state, the initial setting circuit 12 stops outputting the initial signal ■0, so the control element 1
0 cancels the initial setting operation of holding the rack at the fully open position, and outputs the operation signal Vh in accordance with the integral signal V1 which is the integral value of the constant speed control operation signal nd. When starting the engine, the integral signal Vi, which is the time integral of the speed deviation, reaches the lower limit value V.
Since it is smaller than y°, 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 Vnd, and the control mode selection circuit 8B controls the changeover switch 8A to select the constant speed control operation signal Vnd.
Continue typing d. When the start detection signal VS is generated, the integral signal Vi is the lower limit value ■y.

Therefore, the duty of the drive signal Vd is 100x
It is. The rack is therefore held in the fully open position, increasing the amount of fuel supplied to the engine. When starting of the engine is completed and the integral signal Vi becomes equal to or greater than its lower limit value, the starting detection signal VS disappears, so the starting increase control is canceled and a state of constant speed rotation control is entered.

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

In other words, the engine rotation speed N is the command rotation speed N.

Assuming that the speed signal Vn becomes the command speed signal 7
00 or more, the control mode switch 8 outputs the constant speed control operation signal ■nd. At this time, the integrator 9 inputs the integral signal Vi = + f (Vn - Vno) adt
(K1 is a constant.), and the control element 10 outputs the integral signal V
i and the differential signal VD as input, the actual rotational speed N of the engine
Calculate the operation of the rack operating means 2 necessary to correct the fluctuation of the rotation speed N and bring the deviation between the actual rotation speed N and the indicated rotation speed No below the allowable range (preferably to make them match), and calculate the calculated operation amount. The operation signal Vh shown is supplied to the drive circuit 13.

The drive circuit 13 drives the rack operating means 2 in a direction to suppress speed fluctuations based on the signal n output from the control element 10 when the differential signal VD is generated. The correction operation J' is started, and the rack operating means 2 is driven by the amount of operation determined by the integral signal Vi. As a result, the rack moves toward the closed position to a predetermined position (a position necessary to make the difference between N and NO less than the allowable range), and the rotational speed N approaches the commanded speed NO.

Here, if the load increases, the rotational speed N becomes lower than the commanded rotational speed No, and the speed detection signal Vn becomes smaller than the commanded speed signal vnO. If the load torque T at this time is lower than the maximum torque To at the indicated rotational speed No, the rack position is before the maximum rack position, so
The control mode switch 8 outputs a constant speed control operation signal Vnd. Therefore, the control element 10 calculates the amount of operation required to make the difference between the rotational speed N and the commanded rotational speed NO less than the allowable range, and supplies the amount of operation to the drive circuit 13, and the drive circuit 12 only controls the amount of operation. Drive the rack operating means 2. The load torque T is the maximum torque TO at the indicated rotational speed NO
In the following range, the engine rotational speed N is maintained at the commanded rotational speed NO by these operations.

In the present invention, an integrator 9 and a differentiator 14 are provided,
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. By performing the integral operation in this way, the offset can be reduced. Further, by adding a differential operation, the correction operation can be started before the integral signal is generated, so that the settling time can be shortened. Note that the differentiator 14 can also be omitted.

The load torque T is the maximum torque T at the indicated rotational speed No.
o, the rotational speed N becomes lower than the commanded rotational speed No, the speed detection signal n becomes smaller than the commanded speed signal nO, and the rack position reaches the maximum rack position.
You will be able to move beyond the increasing side. At this time, control mode switch 8
outputs the maximum rack position control operation signal ■[d, and the integrator 9 outputs the integral signal Vi=fVLd-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, drive circuit 1
3 drives the rack operating means 2 so that the deviation between the rack position and the maximum rack position is 1° below the allowable range.

Next, referring to FIG. 2, an example of the configuration of the start detection circuit 11 and the control mode selection circuit 8B of the configuration shown in FIG. 1 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 y of the integral signal Vi during steady operation is obtained at both ends of the resistor R2. Integral signal Vi and lower limit value VV are applied to the negative phase input terminal and positive phase input terminal of the comparator CPI, respectively.
A reference signal indicating ' is input, and a start detection signal ys is obtained at the output terminal of the comparator CP1.

The control mode selection circuit 8B includes comparators CP2 and Cr2, resistors R3 and R4, a NOR circuit N0R1, and a NAND circuit N.
A1 and a flip-flop circuit FF consisting of NAND circuits NΔ2 and NA3, and a constant DC voltage is applied to both ends of a series circuit of resistors R3 and R4. Comparator CP
An instruction speed signal ■nO and a speed detection signal Vn are input to the negative phase input terminal and the positive phase input terminal of No. 2, respectively. Further, the rack position signal VL is input to the positive phase input terminal of the comparator CP3, and the maximum rack position signal VLm obtained at both ends of the resistor R4 is input to the negative phase input terminal.

In the circuit shown in Fig. 2, when the integral signal ■i is smaller than the lower limit ■y°, the logic state of the output of the comparator CP1 is "1".
(Start detection signal Vs is output). When the engine is started, the speed detection signal vn is smaller than the commanded speed signal VnO, so the logic state of the output of the comparator CP2 is rOJ. Further, at the time of starting, the rack is initially in the fully open position and the rack position signal VL is naturally smaller than the maximum rack position signal vtn, so the logic state of the output of the comparator CP3 is "0".

In this state, the logic state of the output of NOR circuit N0R1 is "
0'', and the logic state of the output of the NAND circuit NA1 is ``i''.
””. Therefore, the logic state of the reset terminal R of the flip-flop circuit F becomes "1", and the logic state of the output VF of the flip-flop circuit F becomes "0". At this time, the changeover switch 8A selects the constant speed control operation signal Vnd and supplies it to the integration circuit 9. Therefore, when the start detection signal VS is generated (the logic state of the output of comparator CP1 is "1")
), the constant speed control operation signal Vnd is input to the integrating circuit 9, and the rack is maintained at all positions by the above-described operation.

When the engine starts and the integral signal ■i reaches the lower limit ■y° or more, the logic state of the output of the comparison 3CP1 becomes "0".
” is maintained. In this state, if the speed detection signal Vn is smaller than the commanded speed signal Vno, the logic state of the output of the comparator CP2 becomes "0", so the logic state of the output of the NOR circuit N0R1 becomes "1", and the flip-flop circuit The logic state of the set terminal S of the 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 V1 is larger than the maximum rack position signal VLm, so the logic state of the output of the comparator CP3 becomes "1". There is. Therefore, the logic state of the output of the NAND circuit NA1 becomes rOJ, and the logic state of the output terminal of the flip-flop circuit F becomes rlJ.At this time, the changeover switch 8A outputs the maximum rack position control operation signal @V1.d. .This causes the rack position to retreat to the maximum rack position.

In this state, when the engine rotational speed N exceeds the commanded rotational speed NO, the speed detection signal ■n becomes larger than the commanded speed signal Vno, so that the logic state of the output of the comparator CP2 becomes "1". At this time, the logic state of the output of NOR circuit N0R1 is "O".
”, and the logic state of the output of the NAND circuit NAI is “1”.
become. Therefore, the output V of the blood flip 70 tube circuit FF is
The logic state of becomes "0", and the changeover switch 8A gives the constant speed control operation signal Vnd@integrator 9.

Next, the load increases and the rack position becomes the maximum rack position Ll.
When the rotational speed of the engine becomes lower than the commanded rotational speed No., the logic state of the output of comparator CP3 becomes "1", and the logic state of the output of comparator CP2 becomes "0".
Therefore, the logic state of the output of NOR circuit N0R1 is "1".
", the logic state of the output of the NAND circuit NA1 becomes "0", and the logic state of the output VF of the flip-flop circuit FF becomes "
1”. At this time, the changeover switch 8A provides the maximum rack position control deviation signal vLd to the integrator 9.

In the above embodiment, the magnitude relationship between the engine rotation speed and the instruction rotation speed is determined by inputting the speed detection signal Vn and the instruction speed signal ■nO to the control mode selection circuit 8B and comparing both signals. However, instead of the speed detection signal V and the commanded speed signal nO, the operation signal nd indicating the speed deviation signal is input to the control mode selection circuit 8B to determine whether the operation signal Vnd is positive or negative. The magnitude relationship between the speed detection signal and the designated rotational speed may be determined by the following.

[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 drawings]

FIG. 1 is a block diagram showing the overall configuration of an embodiment of the present invention, and FIG. 2 is a circuit diagram that does not show the specific configuration of the main parts of FIG. 1.
FIG. 3 is a diagram showing the output signal of the control element and the output signal of the drive circuit in the embodiment of the present invention, and FIGS. 4 and 5 are diagrams showing the relationship between the speed detection signal and the rotation speed in the embodiment of the present invention, respectively. FIG. 6 is a diagram showing the relationship between the rack position detection signal and the rack position, and FIG. 6 is a diagram showing the relationship between the rack position and rotational speed when a conventional governor is used. 1... Internal combustion engine, 2... Rack operating 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... First It] setting circuit, 13.
...Drive circuit. Figure 2 Figure 3 Procedural Amendment (July 8, 1988, Director General of the Patent Office, Michibu Uga 1, Indication of the case, Patent Application 1988-1681902, Title of the invention: Electronic governor for internal combustion l!1IIl) Apparatus 3, relationship with the case of the person making the amendment Patent applicant (134) Kokusan Denki Co., Ltd. 4, agent 6th floor 5, Bunzan Building, 4-31-6 Shinbashi, Minato-ku, Tokyo ``Scope of the Invention'', ``Details of the Invention (2), page 7, line 8, ``Full position'' is corrected to ``Front closed position''. Above 2, Claims Scope of Supplying Fuel to Internal Combustion v!AI!l rack operating means for operating an injection amount adjustment rack that displaces the fuel injection pump between a fully open position and a minimum position for fully opening the fuel injection pump; and a rack operating means for operating and rotating the rack by the rack operating means. a deviation detection device that obtains a deviation necessary for automatic speed control; an integrator that integrates the operation signal obtained from the deviation detection device and outputs an integral signal Vi; and an integrator that uses the integral signal Vi as input to operate the rack. The engine includes a control element that outputs an operation signal Vh that determines the amount of operation of the means, and a start detection circuit that outputs a start detection signal when it detects that the internal combustion engine is in a start state, and when the start detection signal is generated. When the rack is in the fully open position, the rack is held at the fully open position, and when the start detection signal is not generated, the operation signal Vh is set to an upper limit value VX corresponding to the rack fully open position and a lower limit value ■y corresponding to the rack fully open position. In 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 stable in a range that changes between An initial setting circuit for outputting a signal is provided, and the start detection circuit includes a comparator that compares the magnitude of the operation signal or the integral signal with a reference signal corresponding to the respective lower limit value during steady operation, The control element is configured to output the start detection signal when the signal or the integral signal is smaller than a lower limit value during steady operation, and the control element forces the rack to fully operate when the initial setting circuit is outputting the initial signal. An electronic governor device for an internal combustion engine, characterized in that the electronic governor device for an internal combustion engine is configured to operate the rack operating means so as to move the rack operating device to a round position.

Claims (1)

[Scope of Claims] Rack operating means for operating an injection amount adjustment rack that is displaced between a fully open position for fully opening a fuel injection pump that supplies fuel to an internal combustion engine and a minimum position for fully closing a fuel injection pump; a deviation detection device that calculates a deviation necessary for automatically controlling the rotational speed by operating the rack using the rack operating means; and an integrator that integrates the operation signal obtained from the deviation detection device and outputs 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 rack operation means; and a start detection circuit that outputs a start detection signal when it detects that the internal combustion engine is in a start state. When the start detection signal is generated, the rack is held at the fully open position, and when the start detection signal is not generated, the operation signal Vh is set to an upper limit value Vx corresponding to the fully closed position of the rack. 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 a fully open position of the rack and a lower limit value Vy, 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 so as to forcibly move the rack to a fully open position during output.