JP2001295741A - Working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly stop a starter motor if the starter motor continues to rotate as the operation of returning a key cannot be done; and rationally construct a backhoe resisting theft by making effective use of this arrangement. SOLUTION: A processor 22 is provided which checks an ID number inputted from a keyboard 20 at the start of an engine 7, to supply electric power to the starter motor 24 through the control of a first relay 25 only when the number is correct. The processing action of the processor 22 is set so that on detecting that a key switch 21 is held in a start position for not less than a preset time after the start of the engine 7, the processor forcibly shuts off the electric power to the starter motor 24 through the control of the first relay 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work vehicle provided with an engine starting system for starting an engine by driving a starter motor based on key operations.

[0002]

2. Description of the Related Art In the case of a conventional backhoe or shovel working vehicle, for example, a starter motor for starting an engine is provided, and a key switch for operating the starter motor is disposed near a driver's seat.

[0003]

Here, in consideration of the operation at the time of starting the engine, normally, a key is inserted into a key switch and rotated to supply electric power to a starter motor to start the engine. It has become something. However, when working on site, the key may not be inserted into the key switch in the required amount, and the rotary system may be forcibly rotated and the rotating system may be damaged.
After the starter motor starts rotating, the key switch cannot be rotated in the return direction, and there is room for improvement in that the starter motor continues to rotate even after the engine is started. Also, in the case of a structure in which the key switch portion is exposed, such as a small work vehicle without a cabin, the invasion of dust may deteriorate the rotation system of the key switch portion. In some cases, the key switch cannot be rotated in the return direction, and the starter motor continues to rotate even after the engine is started.

[0004] In a work vehicle such as a backhoe, which is often left at a construction site when a day's work is completed,
In some cases, the user forgot to remove the key switch, left the key attached, and was stolen. In particular, if the key is pulled out and left on the construction site, the key switch can be easily disassembled, resulting in theft.

[0005] An object of the present invention is to detect a starter motor when the starter motor continues to rotate due to the inability to return the key for starting the engine and stop the starter motor. The reason for this is that a work vehicle that is difficult to encounter is configured rationally.

[0006]

According to a first aspect of the present invention, there is provided a work vehicle having an engine starting system for starting an engine by driving a starter motor based on a key operation. A switching unit is interposed in a power supply system to the motor, a key sensor for detecting an operation position of the key is provided, an operation sensor for detecting that the engine is operating is provided, and an input unit for inputting information is provided. In addition, when the key sensor detects that the starter motor is in the operating position, and when the operation sensor determines that the engine is operating,
A processing device for controlling the switching means to cut off the power supply to the starter motor, and for enabling the power supply to the starter motor by the switching means on the basis of the input of specific information to the input means, and The configuration is such that the processing mode of the processing device can be set so as to allow the operation of the motor. The operation and effect are as follows.

A second feature of the present invention (claim 2) is that, in claim 1, the input means is constituted by a keyboard capable of inputting a number, and a preset string of numbers is input from the keyboard. Is determined that the processing mode of the processing device is set to enable supply of power to the starter motor by the switching means when
The operation and effect are as follows.

A third feature of the present invention (claim 3) is that in claim 1, the processing device outputs engine information to a display device based on a signal from a device that outputs a rotation state of the engine. It is configured to perform processing, and its operation and effect are as follows.

[Action]

According to the first feature, if the key cannot be operated to a position where the starter motor is stopped after the engine has been operated by driving the starter motor by operating the key, the key sensor detects Detection results,
The processing device controls the switching means based on the detection result from the operation sensor to stop the power supply to the starter motor, thereby enabling the starter motor to be stopped.When the engine is started, from the input means,
After specific information such as a password or a password is input, power supply from the switching means to the starter motor is permitted, and the engine can be started. That is, while not having a plurality of processing devices, the starter motor is prevented from being wastefully driven, and the processing device is used to control the engine based on information that only a specific worker can know or information that can identify the worker. It makes it possible to start. In particular, in the present invention, the processing mode of the processing device is set so as to cancel the processing for controlling the switching means based on the specific information input to the input means (for starting the engine without inputting a password or the like). Set)
It is also possible to set the processing mode in this way, for example, when performing work or maintenance in an environment where there is little opportunity for outsiders to touch, such as when using indoor work, the engine This eliminates the need to enter a password or password at startup.

According to the second feature, since the input means is constituted by a keyboard capable of inputting a string of numbers, expensive and precise optical sensors such as those for collating fingerprints or palm prints can be used. It is not necessary to provide, and the processing and the configuration are simple.

According to the third feature, the processing device outputs the information of the engine to the display device based on the signal from the device that outputs the rotation status of the engine. Can be grasped, and the device for outputting the rotation state of the engine can be used also as the operation sensor. In the case where the engine is used in this way, it is not necessary to provide a special operation sensor for determining the operation state of the engine.

According to the present invention, even when the key for starting the engine cannot be returned and the starter motor keeps rotating, the starter motor can be quickly stopped by automatically determining this state. At the same time, a work vehicle which is allowed to start the engine only by the operation of a specific worker and is unlikely to be stolen was obtained (claim 1). In addition, the addition of a simple structure having a keyboard makes it difficult for theft to occur (Claim 2). The rotation state of the engine can be grasped through the display device, and the sensor can be shared, thereby simplifying the cost structure. (Claim 3).

[0014]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, a machine base 3 is provided so as to be rotatable around an axis Y in a vertical posture with respect to a rubber crawler type traveling apparatus 2 having a dozer apparatus 1. Boom 4, arm 5, bucket 6
A backhoe device B comprising a series connection of each is provided,
A diesel engine 7 in the machine base 3, a fuel tank 8 for storing fuel to be supplied to the engine 7, a hydraulic oil tank 9 for storing hydraulic oil to be supplied to the dozer device 1 and the backhoe device B, Driver's seat 10 on which an operator sits
And a backhoe as a working vehicle.

The dozer device 1 is constructed so as to be driven up and down by a dozer cylinder C1, and the backhoe device B is configured such that three members, a base end member 4S, an intermediate member 4T, and a front end member 4U, are pivoted vertically. Hydraulic pressure that swings the boom 4 with respect to the machine base 3 while allowing the distal end member 4U to freely move in the horizontal direction with respect to the base end member 4S by swingably connecting around the core. A hydraulic boom cylinder C4, a hydraulic arm cylinder C5 that swings the arm 5 with respect to the boom 4, and a hydraulic bucket cylinder C6 that swings the bucket 6 with respect to the arm 5,
Further, an offset cylinder CS for driving the distal end member 4U in the lateral direction with respect to the proximal end member 4S of the boom 4 is provided. Further, a hydraulic turning motor M for turning the machine base 3 with respect to the traveling device 2 is provided.

A pair of left and right traveling operation levers 13 and 13 and a pair of left and right control levers 1 are provided at a position in front of the driver's seat 10.
4 and 14, a control pedal 15 is provided at a step in front of the driver's seat 10, and a panel is formed at a position on the right side of the driver's seat 10; 1 includes an elevating lever 16 for performing the elevating control, and an accelerator lever 17 for setting the rotation speed of the engine 7. The traveling operation levers 13 and 13 independently control the driving speeds of the left and right crawlers of the traveling device 2 to set the traveling speed and perform steering control. The boom cylinder C4 is controlled by the front / rear operation, the bucket cylinder C6 is controlled by the left / right operation, the arm cylinder C5 is controlled by the front / rear operation of the left side, the turning motor M is controlled by the left / right operation, and the control pedal 15 is depressed. It is associated with a hydraulic control valve (not shown) to control the offset cylinder CS.

As shown in FIGS. 3 and 4, a keyboard 20 (an example of an input means) for inputting a password and a key switch 21 (also used as a key sensor) for starting the engine 7 are provided on the panel section. And a liquid crystal display D. The keyboard 20 includes numeric keys 20N of “0” to “9” and a check key 20C, and the key switch 21 has a stop position OFF where the key 23 can be inserted and removed.
And a glow position G for supplying power to the glow plug of the engine 7 and an ON position O for supplying power to the electric system of the machine base 3.
N and a start position STA for driving the starter motor 24 while maintaining a state of supplying power to the power system of the machine 3.
The liquid crystal display D is configured to rotate freely with the RT.
Is a rotation speed display section D for displaying the rotation speed of the engine 7 by a numeral.
a, a fuel remaining amount display section Db for displaying the remaining amount of fuel in a bar graph manner, and a plurality of information capable of displaying information indicating a charging state of a battery (not shown), information of pressure of lubricating oil in the engine, and the like. The information display part Dc is formed.

As shown in FIG. 5, in this backhoe, a processing unit 22 having a microprocessor for controlling when starting the engine 7 and controlling the liquid crystal display D.
Processing for inserting the key 23 into the key switch 21 and operating the start position START to start the engine 7 and inputting a preset personal identification number from the keyboard 20 to permit the start of the engine 7 If the key switch 21 is at the start position START even after the engine 7 is operated, a program for forcibly stopping the driving of the starter motor 24 is set in the processing device 22. Note that the processing system is configured so that the processing for inputting the password is permitted even when the key switch 21 is not operated to the ON position ON.

That is, the key switch 21 is moved to the glow position G.
A power system that guides the power from the power supply (battery) to the glow plug provided in the engine 7 via the glow terminal g and a system that inputs this voltage signal to the processing device 22 are formed by operating the key switch. When the key 21 is turned to the ON position ON, a system for inputting power from the power supply to the processing device 22 via the ON terminal ON is formed, and when the key switch 21 is operated to the start position START, the power from the power is turned ON. A power system for guiding the electromagnetic solenoid of the second relay 26 via the contact of the first relay 25 via the start terminal start while maintaining the state of supplying the voltage signal to the processing device 22 via the terminal on; 22 is formed. The contact of the first relay 25 is supplied with electric power enough to drive the electromagnetic solenoid of the second relay 26, but the contact of the second relay 26 is large enough to drive the starter motor 24. Since electric power is supplied, the second relay 26 has a large capacity. Then, the first relay 25 and the second relay
The relay 26 is turned on by energizing the electromagnetic solenoid.
It is configured to reach N state.

As shown in FIG. 2, a control system for driving the electromagnetic solenoid of the first relay 25 by a signal from the processing means 22 through the transistor 27 is formed.
A power system for supplying power from a power supply to the starter motor 24 is formed at a contact point of the relay 26 (an example of a switching unit). The starter motor 24 drives and rotates the pinion gear 24G when electric power is supplied, and at the same time, projects the pinion gear 24G to engage with the ring gear 7G of the engine 7 to transmit rotational power. The structure is such that the pinion gear 24G is retracted simultaneously with stopping. A system for inputting a signal from an output terminal of an alternator 28 (an example of an operation sensor) driven by the engine 7 to the processing device 22 is formed, and is turned on when the pressure of the lubricating oil in the engine increases.
A system for inputting a signal from the oil pressure switch 29 to be in a state to the processing device 22 is formed, and a system for inputting a signal from the keyboard 20 and the fuel remaining amount sensor 30 to the processing device 22 is formed. .

The engine start processing as a program for performing the above-described processing is configured as shown in the flowchart of FIG. In other words, in this engine start process, it is determined whether or not the permission information has been set. If the permission information has not been set, the password check routine is executed. If the permission information has been set, the engine 7 has not been set. If the engine 7 is not operating, the engine start routine is executed, and if the engine 7 is operating, the starter detachment routine is executed (# 101, # 102, # 20).
0, # 300, # 400 steps). The permissible information is information for permitting the engine 7 to start. This information is set when an error-free plural-digit password is input, as described later, and based on this information. This is for permitting a transition to a processing flow allowing the start of the engine 7.

As shown in the flowchart of FIG. 7, a password check routine (# 200 step) is configured. That is, when the password input from the numeric keys 20N of the keyboard 20 is displayed on the rotation speed display section Da of the liquid crystal display D and stored in a memory or a register, and then the check switch 20C is turned ON. It is determined whether or not they match by comparing the personal identification number input to the personal identification number and the personal identification number stored in advance (# 201 to # 201).
Step # 204) If they match, the permission information is set (stored in a memory or a register), and a character such as "OK" or a symbol such as "O" indicating the match is displayed on the rotation speed display section. If the password does not match, characters such as "password mismatch" or a symbol such as "x" indicating that the password does not match are displayed on the rotation speed display section, and the entered password is cleared. (# 20)
5 to # 209 steps). With this configuration, it is possible to prevent the engine 7 from being started due to an unauthorized operation, thereby preventing unauthorized use or theft. The password is configured so that the user can set it in advance based on a predetermined operation.

Next, in the engine start routine (# 300 step) shown in the flowchart of FIG. 8, only when the key switch 21 is in the START position, the presence or absence of the start of the engine 7 with the first relay 25 controlled ON. Is determined, and if it is determined that the engine has started, a process of setting the start information (saving in a memory or a register) is performed (# 30).
1 to # 304 steps). When it is determined that the engine 7 has started, the cycle of the intermittent signal from the alternator 28 is compared with the cycle of the initial signal when the key switch 21 is operated to the start position START. It is based on the process of determining that it is in the non-operating state when it has fallen below the cycle or does not change much, and determining that it is in the operating state when the cycle has greatly increased.

Next, in the starter detachment routine (# 400 step) shown in the flowchart of FIG. 9, the flag is determined only when the key switch 21 is in the START position (the initial value is "0"), and the flag is set to "0". If the value is "0", the timer (composed of software) is operated, and after setting the flag to "1", the time set by the timer (about several seconds) elapses, that is, the time is set. The key switch 21 remains in the START position until the time is up.
The relay 25 is turned off (# 40).
1 to # 406 steps). That is, if the state in which the key switch 21 is in the START position continues for several seconds or more after the engine 7 starts, it can be determined that the key switch 21 cannot be returned to the ON position ON.
In such a situation, the starter motor 2
This eliminates inconveniences such as burning of the coil of the starter motor 24 due to the cause that the power supply to the starter motor 4 is forcibly shut off and the starter motor 24 continues to be driven.

That is, in this configuration, the liquid crystal display D
A system for controlling the power of the starter motor 24 is formed by the processing device 22 for controlling the starter motor 24, a keyboard 20 is added, and the start of the engine 7 is permitted only when a preset password is input. Thus, by adding a program for cutting off the power to the starter motor 24 via the power system when a predetermined condition is satisfied after the engine 7 is started, it is possible to adopt a configuration including a special microprocessor or the like. , A single processing unit 2
2, the control of the liquid crystal display D by the processing device 22, the control of permitting the start of the engine 7 only when appropriate by collating the password input from the keyboard 20, and the key switch 21 Is the start position ST
Engine 7 when it is no longer restored from the ART to the ON position
After start-up, a control to automatically stop the starter motor 24 at a predetermined time has elapsed can be performed, thereby not only preventing the coil of the starter motor 24 from burning out but also avoiding theft. It can be done.

[Other Embodiments] The present invention can be configured as follows in addition to the above-described embodiment.

(A) As an input means, a device such as a fingerprint, a palm print or a voice print provided with sensors capable of identifying the individual based on the physical characteristics of the individual, a magnetic card or an IC may be used. It is possible to adopt a device that reads the information on the card.Also, it is also possible to use a plurality of switches provided on the body of the working vehicle as input means and to operate these switches simultaneously, It is also possible to configure so that the operation in the order in which the operation is not performed is regarded as specific information. If the system is configured to allow input of fingerprints, palm prints, and voice prints, it not only suppresses inconvenience and erroneous input of information such as passwords and passwords, but also restricts the use of anyone other than workers. In the case of using a magnetic card or IC card, information can be input quickly and accurately,
When switches are used also as input means, it is not necessary to provide switches and sensors.

(B) As input means, a touch panel is formed on the display surface of the liquid crystal display instead of the keyboard of the embodiment, and a keyboard is displayed on the liquid crystal display when starting the engine, and a finger is displayed on the keyboard. It is possible to input a password or a password by touching. In such a configuration, it is not necessary to particularly provide a keyboard, and it is also possible to provide an easy-to-use configuration, such as displaying operation procedures together on a liquid crystal display.

(C) The processing mode of the processing means is a mode in which the engine is started only when specific information is input from the input means, and the engine is started even when specific information is not input from the input means. It is possible to freely switch to an allowed mode, and it is also possible to use a password or a password to perform this switching. In such a configuration, even when the frequency of starting the engine by a specific worker is relatively high, such as when performing maintenance, it is not necessary to take time and effort.

(D) It is possible to provide a dedicated sensor for determining the operation position of the key switch, and it is also possible to apply the present invention to a work vehicle equipped with a gasoline engine.

[Brief description of the drawings]

FIG. 1 is an overall side view of a backhoe.

FIG. 2 is a plan view of a machine base.

FIG. 3 is a diagram showing keys and key switch operation positions;

FIG. 4 is a plan view of a panel unit.

FIG. 5 is a block circuit diagram of a control system.

FIG. 6 is a flowchart of an engine start process.

FIG. 7 is a flowchart of a password check routine;

FIG. 8 is a flowchart of an engine start routine.

FIG. 9 is a flowchart of a starter detachment routine.

[Explanation of symbols]

 7 Engine 20 Input means 21 Key sensor 22 Processing device 23 Key 24 Starter motor 26 Switching means 28 Operation sensor

Claims (3)

[Claims] 1. A work vehicle provided with an engine starting system for starting an engine by driving a starter motor based on a key operation, wherein a switching means is interposed in a power supply system for the starter motor; A key sensor for detecting an operation position of the engine, an operation sensor for detecting that the engine is in operation, an input means for inputting information, and a key sensor for operating the starter motor. In the detection state, when the operation sensor determines that the engine is in the operation state, a processing device for controlling the switching means to cut off the power supply to the starter motor is provided, and a specific information for the input means is provided. Power to the starter motor by the switching means based on the input of Setting a processing form like processing apparatus which allows a rotatably configured working vehicle are. 2. The system according to claim 1, wherein said input means comprises a keyboard capable of inputting a number, and when it is determined that a predetermined sequence of numbers has been input from said keyboard, power supply to said starter motor by said switching means is provided. 2. The processing mode of the processing apparatus is set to enable the processing.
The working vehicle described. 3. The work vehicle according to claim 1, wherein the processing device is configured to perform a process of outputting information about the engine to a display device based on a signal from a device that outputs a rotation state of the engine.