JPH0561455U - Diesel engine start / stop device - Google Patents

Abstract

(57) [Abstract] [Purpose] Even if the controller that controls the engine stop fails, the key switch can be used to start and stop the engine. [Structure] Key switch 17 and fuel cut solenoid 1
The wire connection terminals 9 are connected to the male / female connection couplers A and B, and when the controller 21 fails, both couplers are directly connected without the output relay 20 to enable the engine to be started.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a start / stop device for a diesel engine mounted on a work vehicle.

[0002]

[Prior Art]

 Conventionally, in agricultural work vehicles such as combine harvesters and tractors, the engine is started and stopped automatically by the operator's key switch operation, and when an abnormality occurs in each part, the engine is automatically detected by the controller (control device). There are things that have been made to stop automatically. Also, as a diesel engine stop device, a closing valve is provided in the fuel supply passage to the injection pump, and the closing valve is normally closed by a return spring to keep the engine stopped and start the engine. Occasionally, a fuel cut solenoid attached to the closing valve is energized to open the fuel supply passage and start the engine.

[0003]

[Problems to be solved by the device]

 The above-mentioned diesel engine stop device can stop the engine by stopping the fuel supply to the engine unless the fuel cut solenoid is energized. For example, even if a wire break occurs, the engine can be reliably stopped, which is safe. In addition, if a controller (control device) that detects an abnormality of the working vehicle and automatically stops the engine is installed in series in the engine stop circuit using the engine stop device, the abnormality of the working vehicle is detected. Even in the event of an occurrence, the engine stop circuit will be opened, and the engine as well as the traveling part and the work equipment that receive power from it can be stopped, and damage to the work equipment due to overload can be prevented. be able to. However, in this case, if the controller (control circuit) itself that detects an abnormality fails, the engine stop circuit opens and the engine stops in the same way, so it is safe to start the engine urgently. When the vehicle is to be evacuated, the engine cannot be restarted unless the control circuit (controller) itself is replaced or the cause of the abnormality is removed, which is a problem.

[0004]

[Means for Solving the Problems]

 The present invention is intended to solve the above problems, and its technical means is to provide a key switch from a battery to a fuel cut solenoid that stops the fuel supply to the engine when not energized and releases the stop when energized. A circuit in which a controller for determining whether the engine is stopped by detecting an abnormal state of the working vehicle is provided while the power is supplied through the controller and the output relay of the controller is inserted in series between the key switch and the fuel cut solenoid. The composition is the gist. If the controller itself fails, the wire connection terminals on the side connecting to the key switch and the fuel cut solenoid output relay are made to be the same type of male / female connection couplers so that both couplers are directly connected. The feature is that the engine can be started even in an emergency.

[0005]

[Action]

 When starting the engine, operate the key switch to energize the fuel cut solenoid. When the fuel cut solenoid is energized, it switches the closing valve and opens the fuel supply passage against the return spring that constantly cuts the fuel supply. If any abnormality occurs in the work vehicle while the engine is running, the controller detects it and processes the signal, and then issues an engine stop command to the output relay. The output relay opens the engine stop circuit and de-energizes the fuel cut solenoid based on the controller command. Therefore, the fuel supply passage is switched to the closed position by the return spring, and the engine stops. Also, when the key switch is operated to the off position, the fuel cut solenoid is de-energized and the engine stops in the same way. In addition, if the controller fails or the engine cannot be started due to a defective output relay contact, etc., connect the coupler between the key switch and output relay, and the fuel cut solenoid and output relay. Then, directly connect the removed key switch and the connection coupler of the fuel cut solenoid to the wiring that does not go through the controller. As a result, the engine can be started and stopped by operating the key switch.

[0006]

【Example】

 An embodiment in which the start-stop device for a diesel engine of the present invention is applied to a combine will be described with reference to the drawings. As shown in FIG. 4, the combine 1 is equipped with a threshing device 4 on the left side of a machine body frame 3 having left and right crawler traveling devices 2 and 2. A control unit 5 is provided on the right side of the threshing device 4. A diesel engine 8 covered by covers 6 and 7 and a radiator cooling device are arranged behind the control unit 5. In addition, in front of the control unit 5, a pretreatment device including a grass body 9, a raising device 10, a mowing device 11, and a conveying device 12 for conveying the mowing culm to the threshing device 4 over almost the entire width of the machine. 13 is mounted so as to be vertically rotatable. Further, a disk-type cutter 14 is attached to the rear portion of the threshing device 4, and a Glen tank 15 is provided as an appropriate strut on a portion above the threshing device 4, the engine 8 and the radiator cooling device. It is erected. In addition, 16 is a paddy discharge auger.

Here, the control section 5 is provided with a key switch 17 for starting and stopping the engine 8, and the key switch 17 is a battery mounted on an airframe as shown in the circuit diagram of FIG. One end is connected to 18, and the switch piece is configured to be switchable to an engine stop position (OF F), an electric component position (ACC), and a starter position (ST). Further, 19 is a fuel cut solenoid integrally attached to a not-shown shut-off valve of the engine 8, and the fuel cut solenoid 19 is connected from an electric equipment terminal (ACC) and a starter terminal (ST) of the key switch 17, It is connected through the contacts of the output relay 20 described later. The stop valve is provided in the fuel supply passage (specifically, between the filter and the injection pump) for the fuel that is supplied from the fuel tank to the injection pump through the segmenter, fuel pump, filter, etc. When the cut solenoid 19 is energized, the closing valve opens the supply passage, and when not energized, the closing valve closes the supply passage by the urging force of the return spring. Therefore, the engine 8 can start the engine by pumping the fuel from the injection pump to the injection nozzle by opening the closing valve, and by closing the engine, the fuel to the injection pump is cut and the engine stops.

Further, in the same circuit diagram, reference numeral 21 denotes a controller for controlling engine stop or controlling each working unit of the combine, and the controller 21 includes a microcomputer main body 22 and an input / output interface 23. , 24 is adopted. The input interface 23 of the controller 21 is connected to sensor switches such as an exhaust sensor 25a, an overflow sensor 25b, a deep handling clogging sensor 25c, ..., Working machine clutch switch 25g arranged in the working section of the combine. The output relay 20 having the contact S inserted in series with the engine stop circuit described above is connected to the transistor 26a forming the output interface 24.

The other transistors 26b, ... Of the output interface 24 are connected to the electrical equipment terminal (ACC) of the key switch 17 via a similar load such as a relay, a solenoid, or a pilot lamp. The wire harnesses are collectively connected to the controller unit 21 by a multi-pole connection coupler 27. However, the wire terminal connected to the output relay 20 that constitutes the engine stop circuit described above is connected by a separate connection coupler other than the multipolar connection coupler 27, and is extended from the key switch 17, for example. If a female connecting coupler A is attached to the end of the wire, connect a male connecting coupler B to the end of the wire extended from the fixed side terminal a of the output relay 20, and from the movable side terminal b of the output relay 20. At the end of the extended wire, a female connection coupler A of the same type as the connection coupler provided on the key switch 17 side, and at the end of the wire extended from the fuel cut solenoid 19 connected to it, a male connection is made at the end. The connection couplers B are attached and connected. Therefore, the connection coupler A on the key switch 17 side and the connection coupler B on the fuel cut solenoid 19 side are male and female connection couplers, and as shown in FIG. 2, without the controller 21 and the output relay 20, Both couplers can be directly connected.

Next, these operations will be described. An operator operates the key switch 17 in the engine stop position (OFF), and the switch piece is moved to the starter position (ST) via the electrical component position (AC C). ), The current supplied from the battery 18 is supplied from the electrical switch position (ACC) and starter position (ST) terminals of the key switch 17 through the contact S of the output relay 20 to the fuel cut solenoid 19 Flow to. As a result, the closing valve of the engine 8 is opened to the fuel supply state, and the engine is started when the starter motor (not shown) is driven. Also, after the engine 8 has been started in this way, during the mowing operation, for example, if the threshing-completed culm, that is, the straw, is clogged due to excessive transport in the disc-shaped cutter 14, The straw sensor 25a detects it and inputs a signal to the controller 21. Here, the controller 21 determines whether or not the engine needs to be stopped based on the signal. When it is determined that the engine needs to be stopped, the output transistor 26a is activated, the contact S of the output relay 20 is opened, and the fuel cut solenoid 19 is made non-conductive. Therefore, the closing valve of the engine 8 shuts off the fuel supply by the return spring, and the engine stops.

The above operation will be supplementarily described with reference to the flow chart of FIG. 3. The engine stop control is executed only during the reaping work, that is, when the work machine clutch is engaged and each part is driven. If the work implement clutch switch 25g is OFF, stop control is not performed. Here, when the work implement clutch switch 25g is ON and the work is performed, the straw sensor 25a described above or the handling depth clogging sensor 25c provided in the transport device 12 for transporting the cut grain culm to the threshing device 4 is operated. When the cutter 14 part or the transport device 12 part detects that the grain culm is jammed and is turned on, the rise of each sensor switch is detected and the delay timer T starts counting time, and the predetermined timer time t elapses. However, if the sensor switch is still ON, the output relay 20 for stopping the engine is turned ON, the fuel cut solenoid 19 is turned off, and the engine 8 is stopped. Note that if the sensor switch is turned on by temporarily transferring an excessively large grain culm to the carrier device, the sensor switch will not be activated during the timer time t as long as it does not cause clogging. It is turned OFF again, in which case the delay timer T is cleared, and the engine stop output relay 20 continues to be OFF, so engine stop is not executed. Also, if the engine 8 stops once due to a transport jam, the grain culm can be removed from the transport device and the work can be restarted, and as in the case where the work is continued without stopping the engine, the jam becomes high. It is possible to avoid a serious situation that would damage the working part. Moreover, if repairs cannot be performed on the spot, the engine can be started by disengaging the work machine clutch and releasing the engine stop control, and the combine can be moved to a place where it is easy to perform repairs for efficient maintenance.

Further, when the controller 21 fails in the circuit of FIG. 1 or when the contact S of the output relay 20 is defective, the contact S of the output relay 20 opens and the engine 8 is placed on the safe side. Stop. However, if such a situation occurs while driving on the road, the engine cannot be started unless the defective controller 21 or the output relay 20 is replaced / repaired, which disturbs the passage of traffic, which is not preferable. .. Therefore, in such a situation, as shown in the circuit diagram of FIG. 2, the connecting coupler A on the key switch 17 side and the connecting coupler B on the fuel cut solenoid 19 side are connected to the connecting couplers B and A on the output relay 20 side. And reconnect so that both couplers A and B are directly connected. This allows the fuel cut solenoid 19 to be energized or de-energized by directly operating the key switch 17 without using the failed controller 21 or the output relay 20, and the engine can be started as usual even in an emergency. It becomes possible and the traveling device can be driven to escape. Then, it can be moved to a place suitable for repair, and defective parts can be replaced and repaired efficiently.

[0013]

[Effect of the device]

 As described above, the present invention supplies power to the fuel cut solenoid 19 which stops the fuel supply to the engine 8 by de-energizing and releases the stop by energizing, from the battery 18 through the key switch 17, and at the same time the abnormality of the working vehicle. Since the controller 21 for detecting the state and determining whether the engine is stopped is provided, and the output relay 20 of the controller is inserted in series between the key switch 17 and the fuel cut solenoid 19, the fuel cut solenoid is used. The engine 8 can be reliably stopped even if the power supply circuit for 19 fails or the controller 21 fails, and the reliability of the engine stop operation can be improved. In addition, when the working vehicle is abnormal, the engine can be automatically stopped at low cost by using the engine stop circuit by the key switch 17, and the work device is prevented from being damaged due to overload and restarted. The recovery time can be significantly shortened. Moreover, the wire connection terminals connected to the key switch 17 and the output relay 20 of the fuel cut solenoid 19 are respectively provided to the male and female connection couplers A and B of the same type, and both couplers are directly connected to connect the engine 8 to each other. Since it can be started, even if the controller 21 or the output relay 20 fails, it is possible to escape in an emergency by reconfiguring the wiring very easily, and the safety of the vehicle is dramatically improved. Can be improved.

[Brief description of drawings]

FIG. 1 is a start / stop circuit diagram of an engine.

FIG. 2 is a circuit diagram when wiring is rearranged.

FIG. 3 is a flowchart of engine stop control.

FIG. 4 is a perspective view of a combine.

[Explanation of symbols]

 8 Engine 17 Key Switch 18 Battery 19 Fuel Cut Solenoid 20 Output Relay 21 Controller A Connection Coupler B Connection Coupler

Claims (1)

[Scope of utility model registration request] 1. A fuel cut solenoid that stops fuel supply to an engine when not energized and releases the stop when energized, supplies power from a battery via a key switch, and stops the engine by detecting an abnormal state of a working vehicle. Is provided with a controller for making a determination, and the output relay of the controller is inserted in series between the key switch and the fuel cut solenoid, and the wire connection terminal on the side connected to the output relay of the key switch and the fuel cut solenoid is connected. , If they are not the same type of male / female connection couplers, and if a failure occurs in the controller itself, connect both couplers directly,
A start-stop device for a diesel engine, characterized in that the engine is configured to be connected and startable.