JPH03199645A - Electronic control fuel injection device of mobile agricultural machine - Google Patents

Abstract

PURPOSE:To prevent malfunction of a main body of a controller for an electronic control fuel injection device by arranging the main body at the intake side of cooling air of a radiator and in the vicinity of a battery as close as possible. CONSTITUTION:In an electronic control fuel injection device, a target fuel injection quantity is calculated by deviation between real speed of an engine E detected by a speed sensor and a set value of the engine speed based on a detection value of an acceleration sensor so as to drive an injector. A main body A of a controller is arranged at the intake side of cooking air of a radiator 13 and in the vicinity of a battery 1 as close as possible. Electric power transmission circuits to a startor 5 and the controller A are parallelly arranged with respect to the battery 1 so as to stop the lowering of voltage at the time of starting the startor 5 only at the inside of the startor circuit. The main body of the controller A is protected from high temperature, and the lowering of the voltage by the long wiring and the like is prevented so as to prevent generation of malfunction.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an electronically controlled fuel injection device for a diesel engine mounted on a mobile agricultural machine such as a tractor.

(b) Prior Art Conventionally, the technology of applying an electronically controlled fuel injection device to a diesel engine has been known.

For example, there are techniques described in Japanese Patent Application Laid-Open No. 60-256529'S3 and Japanese Patent Application Laid-Open No. 64-83848.

Furthermore, in the electronic control mechanism of a mobile agricultural machine such as a tractor, a technique is known in which the main body of the controller is disposed below the seat.

For example, there is a technique described in Japanese Patent Publication No. 62-61457.

(C) Problems to be Solved by the Invention The present invention solves the problem of the prior art electronically controlled fuel injection device 1. This is to prevent the 217 troller main body constituting the section from malfunctioning due to exposure to high temperatures.

Also, does the controller itself generate electricity for driving the starting motor during engine startup? Due to the 1'1 cost, a heavy pressure drop of the spirit sending times n to the controller body occurs, and the control [! - There was a problem in which the main body of the main unit became inoperable or malfunctioned, so this will be resolved.

(d) Means for Solving the Problems The problems to be solved by the present invention are as described above, and the means for solving them will be explained next.

Compares the actual value of engine rotation speed detected by the rotation speed sensor with the set value of engine rotation speed detected by the accelerator sensor, calculates the target injection rate, and operates the actuator to achieve the injection amount. In the electronically controlled fuel injection device configured as above, the controller main body for the electronically controlled fuel injection device is connected to the radiator 1.
It is placed on the cooling air suction side of No. 3 and as close as possible to the bath notebook 1.

Further, a starter circuit for transmitting power to the starter and a controller circuit for transmitting power to the controller body are arranged in parallel with respect to the battery, and an input circuit from the battery to the central controller CI) in the controller body;
It is constructed by branching the input circuit to the actuator.

(e) Embodiment The problems to be solved by the present invention and the means for solving them are as described above.Next, the structure of the embodiment shown in the attached drawings will be explained.

The position of the controller main body A in the bonnet 71-B will be explained with reference to FIGS. 1, 2, and 3.

A front I frame 19 protrudes from the side of the engine E, and a bonnet B is placed on the front frame 19.

The front surface of the bonnet B constitutes a front grill F, and the front grille F is provided with a grid-like or mesh-like air intake.

The left and right headlights 9I are located immediately behind the front grille F.
,・9R are arranged. The front lα lights 9L and 9R are fixed in front of the headlight support frame 20, and the controller main body A, which is the main part of the present invention,
It is attached to a mounting bracket at a position between R with a vibration isolating plate 18 interposed therebetween.

A battery l is installed at the rear of the controller main body A.
! The radiator 1 is installed at the rear of the bonnet) B.
3 is placed. Further, an engine E is arranged at the rear of the radiator 13, a scooter 5 is arranged as an example of the engine E, and an electronically controlled fuel injection extraction pump C is arranged on the other side.

Further, an air filter 17 is arranged above the battery (2).

Further, a self-diagnosis lamp 8 is provided on the front side of the controller main body, which is a main part of the present invention, as shown in FIGS. 1, 2, and 3. It is configured to turn on when an abnormality occurs in A or the entire electronically controlled fuel injection system.

The controller main body A is arranged inside the bonnet B, but since the mounting position of the controller main body A is immediately behind the front grill F, the seventh controller main body A is installed through the grid part of the front grill F. As shown in the figure, the operator can look into the self-diagnosis lamp 8.
It is configured so that the lighting status of the lamp can be checked.

The configuration of the electronically controlled fuel injection device will be explained with reference to FIGS. 6 and 10.

The fuel tank protruding into the governor case of the fuel injection pump P1. At one end of the lever 23, an actuator 3 of a sled type 5 and a rank position sensor 6 of a differential transformer type are arranged side by side via a connecting part. Further, a magnetic rotating body 25 is attached to the camshaft 24, and a groove is formed in the flange-like edge.

A rotational speed sensor 7 is disposed close to the magnetic rotating body 25 and is configured to detect the rotational speed from the number of changes in magnetism as the magnetic rotating body 25 passes through the recess 113.

Additionally, an accelerator operating mechanism that is operated by an operator is separately provided, and an accelerator sensor 4 that detects a set value by the accelerator operating mechanism is provided.

The controller body A configured as described above, to which signals are transmitted from the accelerator sensor 4, rank position sensor 6, and rotation speed sensor 7, is configured as follows.

II is an I transistor that controls the actuator 3 according to a signal from the central processing unit C]) U;
The central processing unit cpu performs A/D and D/ of various human output signals.
Ai) A, I10 control ROM that converts pulse counts, pulse outputs, etc., c that provides control calculations and input/output support.
pu, a RAM used for control calculations of the CPLJ, and a program l'? that stores a control program. It is composed of a data ROM, etc. that stores various data necessary for control calculations such as OM and speed fluctuation rate characteristics.

As shown in Fig. 5, connection terminals a-b, c-d-c come out from the controller main body A, and the connection terminals are connected to the actuator 3, accelerator sensor 4, rank position sensor 6, and rotation as shown in Fig. 4. It is connected to a number sensor 7 and a battery 1.

An overview of the control by the electronically controlled fuel injection device will be explained.

First, the accelerator sensor 1 recognizes the set rotation speed set by the operator using the accelerator operation mechanism, and then the rotation speed sensor 7 recognizes the actual engine rotation speed.
The rack position equivalent to no-load in FIG. 8 is read from both, and the target rack position to be set is calculated from these.

The actual rank position is recognized by the rank position sensor 6, and a control signal is sent to the actuator 3 to change the actual rank position to the target position.

In this way, the position of the fuel rack 23 of the fuel injection pump P is automatically adjusted, and operation is performed at a predetermined speed fluctuation rate.

A case will be described in which the engine E equipped with such an electronically controlled fuel injection device is mounted on a tractor.

In pest control work, etc. that requires continuous work at a constant speed, the speed will decrease if the load on the implement changes while driving through the field with this type of pest control implement installed, so please reduce the speed. In order to return to a constant state, conventionally it was necessary to change the position of the fuel rack 23 by operating the transmission using a gear shift lever or by depressing a foot-operated accelerator pedal.

However, when an electronically controlled fuel injection system is used as in the present invention, the engine E's lightning control 2 fuel injection system operates and the engine E is forced to constantly maintain the rotation speed set by the accelerator operation mechanism. Since the fuel rack 23 moves automatically, there is no need for the operator to operate the gear shift lever to change the speed or operate the accelerator pedal.

Therefore, by rotating and fixing the fixed accelerator L/bar in a predetermined position, the machine can be operated in auto-cruising mode regardless of changes in the load on the work equipment.
It is possible to perform work at a constant speed.

This point is illustrated in FIG.

In the case of a conventional fuel injection control device using a mechanical governor, as shown by the dotted line in FIG. 9(a), the engine speed decreases as the load is applied.

In order to return this decrease in rotational speed to the original predetermined rotational speed, it was necessary to operate the accelerator operating mechanism to move the fuel rack 23 and restore the rotational speed.

On the other hand, when using an electronically controlled fuel injection system, as shown by the solid line (b), the rotation speed and engine shaft output change when a load is applied, and when the rotation speed falls below the set value of the accelerator operation mechanism, the controller body Actuator 3 from A
A signal is output to move the fuel rack 23 and return the rotation speed to the required rotation speed set by the accelerator operating mechanism while leaving the accelerator operating mechanism unchanged.

The position of the fuel rack 23 in this control is determined from the special map shown in FIG.

The controller main body A, which constitutes the central part of the electronically controlled fuel injection system as described above, has the disadvantage of being susceptible to high heat. , F "J'nt Grill F"
It is placed directly behind the hood to protect it from high temperatures.

In addition, the central processing unit CPU in the controller main body A is
A certain minimum voltage has been determined to prevent erroneous operation, and if the voltage drops below this level, erroneous operation may occur.

If the controller body is placed at the rear and the battery is placed at the front as in the conventional technology, the long wiring will cause a voltage drop, increasing the possibility of incorrect operation. be.

Therefore, in the present invention, the controller body A is placed as close to the battery 1 as possible.

Also, when starting the scooter motor 5,
Since a large amount of electric power is used to start the motor, a voltage drop occurs, which tends to cause erroneous operation of the controller body.

In the present invention, in order to eliminate this problem, the scooter that transmits power to the starter 5 for the battery 1 is
The circuit 15 and the controller circuit 14 that transmits power to the controller main body A are arranged in parallel, and an input circuit 14a that supplies power from the battery to the central processing unit CPU in the controller main body.
The input circuit 14b to the actuator is branched.

(F) Effects of the Invention Since the present invention is constructed as described above, it has the following effects.

Claim (11) Compares the actual value of the engine rotation speed detected by the rotation speed sensor and the set value of the engine rotation speed detected by the accelerator sensor, calculates the target injection amount, and calculates the target injection amount. In an electronically controlled fuel injection device configured to operate an actuator, a controller main body for the electronically controlled fuel injection device is placed on the cooling air intake side of the radiator and as close as possible to the battery. As a result, conventionally, in pest control work that requires continuous work at a constant speed, when such a pest control work machine is installed and is running in a field, the speed will change when the load on the work machine changes. Because of this, in order to return the speed to a constant level, the driver had to change the position of the fuel rack 23 by operating the gear shift lever or depressing the foot-operated accelerator pedal. .

On the other hand, when an electronically controlled fuel injection device is used as in the present invention, the device operates the electronically controlled fuel injection n= of the engine E to constantly maintain the rotation speed set by the accelerator operation mechanism. Since the fuel rank 23 moves automatically to achieve the desired speed, the operator no longer needs to operate the gear shift lever to change the speed or operate the foot-operated accelerator pedal.

Therefore, by rotating and fixing the fixed accelerator lever in a predetermined position, it is possible to always perform work at a constant speed in an auto-cruising state regardless of changes in the load on the work equipment. It can be done.

In addition, the cooling effect of the cooling fan of the radiator 13 can protect the controller body A from high temperatures, and by placing the controller body A as close as possible to the battery 1, voltage drop due to long wiring can be prevented. This made it possible to eliminate erroneous operation of the controller body A due to voltage drop due to long wiring.

According to claim (2), a starter circuit that transmits power to the starter and a controller circuit that transmits power to the controller body A are arranged in parallel with respect to the battery, and the battery is connected to the central processing unit cPU in the controller body. Since the input circuit and the input circuit to the actuator are branched, the voltage drop caused by starting the starter 5 can be stopped only within the starter circuit 15, thereby eliminating the voltage drop in the controller circuit.

Furthermore, by branching the input circuit 14b on the actuator 3 side and the input circuit on the central processing unit cPU side, the configuration can be made so that it is not easily affected by the voltage drop caused by the operation of the actuator 3.

[Brief explanation of drawings]

Figure 1 is a side view of the hood of the tractor inside the mobile machine, Figure 2 is the same front view, Figure 3 is a side view of only the controller main body A, and Figure 4 shows how the scooter is moved from the battery 1 to the controller main body. -5 and the electric circuit diagram for the actuator 3, Fig. 5 is a diagram showing the internal configuration of the controller body A, Fig. 6 is a control block diagram, and Fig. 7 is a diagram of the self-diagnosis lamp 8. A side view showing the inspection status, Fig. 8 is a drawing showing the positional relationship between the engine speed and the ranks operated by the actuator, Fig. 9 is a drawing showing the relationship between the engine speed and horsepower, and Fig. 10 is an electronically controlled fuel It is a side sectional view showing an injection device. A... Controller body B... Bonnet E... Engine P... Fuel injection pump ・ ・ ・ Battery actuator ・ Accelerator sensor ・ Starter ・ Rank position sensor ・ Rotation speed sensor ・ Self-diagnosis lamp radiator

Claims (2)

[Claims] (1) Compare the actual value of the engine rotation speed detected by the rotation speed sensor and the set value of the engine rotation speed detected by the accelerator sensor, calculate the target injection amount, and set the injection amount to the target injection amount. In an electronically controlled fuel injection device configured to operate an actuator, the controller body for the electronically controlled fuel injection device is arranged on the cooling air intake side of the radiator and as close as possible to the battery. Features: Electronically controlled fuel injection system for mobile agricultural machinery. (2) In claim (1), for the battery,
A starter circuit that transmits power to the starter and a controller circuit that transmits power to the controller body A are arranged in parallel, and the central processing unit C in the controller body is connected from the battery to the controller body A.
An electronically controlled fuel injection device for a mobile agricultural machine, characterized in that an input circuit to a PU and an input circuit to an actuator are configured by branching.