JP2000328987A - Starting control system for work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a work vehicle from slipping down when starting on a hill by reducing time lug arose when braking is released until engine starts. SOLUTION: In this work vehicle, an engine with a throttle valve driven by a DC motor 63 is mounted. Further, an oil temperature sensor 68 for sensing engine temperature and throttle valve opening calculation means 51 are provided. The throttle valve opening calculation means 51 calculates an opening of a throttle valve when the vehicle starts based on the engine temperature and activates the DC motor 63 for adjusting the opening of the throttle valve to the calculated one. The throttle valve opening calculation means 51 also controls the opening of the throttle valve when the engine starts in a cool state so that the engine enters a complete explosion state rapidly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a starting control device for a traveling vehicle which is not used for traveling on a general public road, and is particularly effective when applied to a working vehicle such as a transport vehicle, a golf cart, a lawn mowing vehicle and the like. It is about technology.

[0002]

2. Description of the Related Art Conventionally, various operations including a motor, such as an engine, have been used for moving a player in a golf course, transporting a golf bag, etc., or performing various operations such as turf management in a garden or the like, spraying of chemicals, mowing, and the like. Vehicles are widely used. In this work vehicle, the prime mover is driven in accordance with the amount of depression of the accelerator pedal, a brake is applied when the brake pedal is depressed, and a parking brake is applied when the vehicle is stopped. In this case, as a parking brake, in addition to a lever system as in a passenger car, there is a parking brake in which a parking brake mechanism is incorporated in a foot brake mechanism in terms of operability and safety.
There, for example, split the brake pedal into two panels, upper and lower, and press the upper panel to apply the normal brake,
When the lower panel is pressed strongly, the mechanism is locked and the parking brake is applied.

On the other hand, the release of the parking brake is performed by lever operation in the case of the lever system, but in the case of the foot brake system, it is often performed by operating the pedal in conjunction with the accelerator pedal. That is, when the accelerator pedal is slightly depressed, the brake pedal is unlocked, the brake pedal is returned to its original position by a spring or the like, and the parking brake is released.

[0004] Also, like the release of the parking brake,
In many cases, the engine is also started by depressing the accelerator pedal. In this case, when the accelerator pedal is depressed beyond the engine start position, the starter is driven and the engine starts. Therefore, in vehicles equipped with these mechanisms,
After the key switch is turned on, when the accelerator pedal is depressed slightly, the parking brake is automatically released first, and then when the pedal is further depressed, the engine starts. That is,
Here, both the release of the parking brake and the activation of the engine can be performed with a single pedal operation, and the operation of the golf cart or the like can be performed with a simple operation.

Further, in such a working vehicle, after the engine is started, the engine is driven according to the stroke amount of an accelerator pedal. At that time, in order to limit the maximum speed of the vehicle from the viewpoint of operability and safety, many vehicles are provided with a so-called governor device. In this case, as a governor device, a mechanical type device that is conventionally incorporated in a part of a speed reduction mechanism such as a transmission is known, and in this case, a governor is provided with a rotation speed proportional to the vehicle speed by a gear or the like to thereby increase the vehicle speed. To get governor force according to By using the governor force, the throttle is closed through the mechanical linkage against the pulling force of the accelerator pedal wire, thereby regulating the maximum speed of the vehicle.

[0006]

Here, in such a working vehicle, when the release of the parking brake and the setting of the engine start are good, the engine starts almost simultaneously with the release of the brake. Therefore, for example, even when starting a vehicle on a slope such as a hill or a hill,
Since the engine is started immediately after the wheels are released, the vehicle can be started with almost no decrease in inclination.

However, since the brake release mechanism is a mechanical setting, it is difficult to always maintain the best adjustment state. Also, depending on the state of the engine, it takes time to start, sometimes a time lag occurs between the release of the brake and the start of the engine, and it takes time for the vehicle to start running after the wheels are released. There are cases. Therefore, when the vehicle is started on a slope, there is a problem that the vehicle slips down the slope during this time lag. In particular, in a vehicle equipped with a carburetor engine, there is a problem that it takes time to start the engine when the vehicle is cold, and the time lag is further increased. Further, in an engine equipped with a mechanical governor device, there is a problem that the engine is harder to start because the throttle valve is always fully opened at startup.

In this case, in the golf cart engine starting device disclosed in Japanese Patent Application Laid-Open No. Hei 1-331367, the engine is started and stopped by operating a brake lever.
By operating the engine before the brake lever reaches the brake release position, the vehicle is prevented from slipping on a slope. However, in this case, the engine is started and stopped by a brake lever, and is intended only for a golf cart used for transporting a golf bag or the like, and has a configuration different from that in which a person gets on and an engine is started by an accelerator pedal. It does not solve the above-mentioned problems.

It is an object of the present invention to reduce the time lag from the release of the brake to the start of the engine by shortening the engine start time, and to minimize the slip of the working vehicle when starting on a slope. .

[0010]

According to a first aspect of the present invention, there is provided a starting control apparatus for a working vehicle, comprising: an internal combustion engine; and valve driving means for driving a throttle valve of the internal combustion engine. Engine temperature detection means for detecting the temperature of the internal combustion engine; and calculating the opening of the throttle valve when starting the internal combustion engine based on the internal combustion engine temperature detected by the engine temperature detection means, However, there is a throttle valve opening calculating means for operating the valve driving means so as to achieve the calculated opening.

Thus, the optimum opening of the throttle valve can be selected in accordance with the temperature of the internal combustion engine, and the internal combustion engine can be controlled in an optimum state. Slipping at the time of starting can be minimized.

When the internal combustion engine is started from a cold state, the throttle valve opening calculating means calculates
The opening degree of the throttle valve may be limited so that the internal combustion engine is in a complete explosion state.
Even in a cold state, the internal combustion engine can be started quickly.

In addition, the starting control device further includes an intake air temperature detecting means for detecting an intake air temperature of the engine, and the throttle valve opening calculating means is configured to calculate the throttle valve opening based on the internal combustion engine temperature and the intake air temperature. The degree of opening of the throttle valve may be calculated, thereby enabling highly accurate engine control. Further, an oil temperature sensor for detecting a lubricating oil temperature of the internal combustion engine may be used as the engine temperature detecting means.

On the other hand, another start control device of the present invention is a start control device for a working vehicle which is equipped with an internal combustion engine and is started when the accelerator pedal is depressed to an engine start position. Inclination detection means for detecting the inclination amount of the work vehicle, accelerator stroke amount detection means for detecting the depression amount of the accelerator pedal, and setting the engine start position based on the vehicle inclination amount detected by the inclination detection means And an engine start position setting unit that performs the operation.

As a result, the amount of accelerator depression until the start of the engine is changed according to the inclination, and the time until the start of the engine when the vehicle starts on a slope is reduced.

In this case, the engine start position setting means may set the engine start position such that the stroke amount of the accelerator pedal before reaching the engine start position decreases as the vehicle lean amount increases. good. As a result, when the vehicle starts on a slope, the internal combustion engine is started with a smaller step margin than on a flat ground. Therefore, the time lag from brake release to engine start is reduced,
It is possible to minimize slippage when starting on a slope.

[0017]

(Embodiment 1) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory diagram showing a configuration of a golf cart (working vehicle, hereinafter abbreviated as cart as appropriate) provided with a start-up control device according to Embodiment 1 of the present invention. The cart according to the present invention detects the warm-up state of the engine by an oil temperature sensor or the like, automatically sets the throttle valve to an optimal opening when the engine is started,
The engine is started immediately even in cold conditions to minimize cart slippage due to the start time lag.

The cart according to the present embodiment is a traveling vehicle with an automatic transmission. As shown in FIG. 1, an engine (internal combustion engine) 1 is disposed at the center of the vehicle body, and the engine 1 drives a rear portion of the vehicle. The wheel 2 is driven. The output from the engine 1 is input to the transmission device 4 via the automatic transmission 3. A differential device 61 is provided in the transmission device 4, through which the power of the engine 1 is transmitted to the axle 62 to rotate the drive wheels 2.

The cart employs a belt-type continuously variable transmission (CVT) as the automatic transmission 3, and a drive pulley 5 is provided on a crankshaft, which is an output shaft of the engine 1. Also, the transmission device 4
An input shaft 6 is provided with a driven pulley 7, and a belt 8 is stretched between the pulleys 5 and 7. The groove widths of the pulleys 5 and 7 can be appropriately changed by a hydraulic device (not shown) under a command of a TCU (transmission control unit), and the winding diameter of the belt 8 is appropriately changed by the change in the groove width. The speed can be changed continuously. The cart is of a hydraulic type controlled by electronic control, but may be of a mechanical type by a centrifugal governor.

The input shaft 6 of the transmission 4 is provided with a rotor 9 having a plurality of projections 9a on its outer periphery. In the vicinity of the rotor 9, there is provided a vehicle speed sensor 10 for detecting the speed of the vehicle by detecting the approach and separation of the projection 9a. In the present embodiment, a magnet pickup (magnetic sensor) is used as the vehicle speed sensor 10, and a pulse signal generated as the vehicle passes through the projection 9 a is transmitted to an ECU (engine control unit) 4.
Sent to 0.

The input shaft 6 is located in front of the differential device 61, and in the cart, a vehicle speed sensor 10 is provided.
Is provided not on the axle 62 located downstream of the differential device 61 but on the input shaft 6 located upstream of the differential device 61.
Therefore, the vehicle speed can be detected without being affected by the differential action of the differential device 61, and the vehicle speed can be accurately detected without errors. Further, since the vehicle speed can be detected by pulse counting, it is possible to improve the accuracy of various controls performed based on the vehicle speed. Furthermore, since it is a non-contact type vehicle speed detection mechanism, there is no secular change due to wear and reliability is improved.

On the other hand, as shown in FIG. 2, an intake port 12 and an exhaust port 13 are formed in a cylinder head 11 of the engine 1. In addition, these ports 12,
An intake valve 15 and an exhaust valve 16 are provided between the combustion chamber 13 and the combustion chamber 14 of the engine 1, and these are opened and closed at predetermined timing by a cam and a rocker arm (not shown). Also, the cylinder head 11 has
An ignition plug 17 whose tip is exposed to the combustion chamber 14 is provided, and the ignition timing of the ignition plug 17 is controlled by the ECU 40 via an igniter (not shown).

The intake system of the engine 1 is provided with an injector device 18 and an electronic governor device 19.

An intake pipe 20 is provided in the intake port 12 of the engine 1 in communication with the intake port 12, and an injector device 18 is attached near a connection between the two.
The intake pipe 20 has a pressure sensor 26 for detecting the intake pipe pressure.
Is provided. The injector device 18 is provided with an injector 21 for injecting fuel toward the intake port 12, and gasoline is supplied to the fuel rail 22 from a fuel tank (not shown) via a fuel pipe. Then, under the control of the ECU 40,
Gasoline is injected and supplied to the engine 1 by the injector 21. The gasoline injection amount is controlled based on the suction pipe pressure and the engine speed.

A throttle valve 23 provided with an electronic governor 19 is provided upstream of the injector 21. In this embodiment, the throttle valve 2
As 3, an electric throttle with a signal output for feedback is adopted, and a DC motor (valve driving means) is used.
63. Then, the DC motor 63 is feedback-controlled by the ECU 40, whereby the valve opening is controlled at a desired opening. The valve opening is detected by a potentiometer (not shown).

The throttle valve 23 is controlled by the ECU 40 based on an accelerator opening, which will be described later, a suction pipe pressure, and a vehicle speed.
And the opening degree is appropriately adjusted by the electronic governor device 19. That is, the vehicle speed sensor 10
When it is detected that the vehicle speed is equal to or higher than a predetermined value,
In order to limit the cart speed, the opening of the throttle valve 23 is limited by the electronic governor 19, and the air supply amount to the engine 1 is reduced. For this reason, the engine speed is suppressed and the vehicle speed is reduced, whereby the cart is controlled so as not to exceed the predetermined speed limit.

As described above, the cart employs the electronic governor device 19 instead of the mechanical governor device.
There is no malfunction due to elongation, deterioration, rust or the like of the accelerator wire, and there is no mechanical linkage, so that the degree of freedom in vehicle design is improved. Furthermore, because it is electronically controlled, there are no unstable phenomena such as speed undulations due to poor mechanical settings, and no control delay due to increased play, etc. Is good, and the degree of freedom of the design is improved.

An air cleaner 24 is provided upstream of the throttle valve 23 to remove dust and the like in the air flowing into the suction pipe 20. Further, an intake air temperature sensor (intake air temperature detection means) 67 is provided near the air cleaner 24 of the intake pipe 20, so that the outside air temperature can be detected from the temperature of the intake air.

A flywheel 25 having a plurality of projections 25a on the outer periphery is attached to the crankshaft of the engine 1. An engine speed sensor 35 is provided in the vicinity of the flywheel 25 so that the engine speed can be detected by detecting the approach and separation of the projection 25a.

An oil temperature sensor (engine temperature detecting means) 68 is provided at the top of the engine 1 so that the engine temperature (internal combustion engine temperature) can be detected.
In the cart according to the present invention, the warm-up state of the engine is detected by the oil temperature sensor 68, and the throttle valve 23 is automatically set to an opening at which the engine can be easily started when the engine is started. That is, control is performed so that the engine 1 can be started under the best conditions by taking advantage of the use of the electronic throttle. Therefore, the engine start time can be shortened, and the engine can be started quickly even in a cold state.

Further, the engine 1 is provided with a starter generator (starter) 27 (see FIG. 1) for starting the engine. This starter generator 27
Is controlled by the ECU 40 and functions as a starter motor when the engine is started, and functions as a generator after the engine is started. In the cart, when the driver is absent or the like, the starting of the engine is suppressed, and at this time, the starter generator 27 is controlled so as not to operate.

In addition, as shown in FIG. 1, a driver's seat 28 is provided in front of the cart, and a key switch 30, which is a main power switch of the cart, is provided in front of the driver's seat 28. When the key switch 30 is turned on, the ECU 40, the TCU, and the like receive a signal to that effect and start a predetermined operation. An accelerator pedal 31 and a brake pedal 69 are provided on the floor of the driver's seat 28. In this case, the brake pedal 69 is configured to serve both as a foot brake and a parking brake. When the upper part 69a of the pedal is depressed, the parking brake is applied. On the other hand, the accelerator pedal 31
Is transmitted to the ECU 40 in the form of an electric signal. In this cart, when the accelerator pedal 31 is depressed to a predetermined parking brake release position, the parking brake is released first, and then when the accelerator pedal 31 is depressed to the engine start position, the starter generator 27 is driven and the engine 1 starts. .

FIG. 3 is an explanatory diagram showing a schematic configuration of a stroke amount detecting mechanism of the accelerator pedal 31. As shown in FIG. 3, the accelerator pedal 31 is
It is installed in the cart with it attached. A potentiometer (accelerator stroke amount detecting means) 34 connected to the accelerator pedal 31 via a link mechanism 33 is provided inside the pedal box 32.
Then, when the accelerator pedal 31 is depressed, the sliding contact side of the potentiometer 34 is moved by the action of the link mechanism 33, and the resistance value fluctuates. Therefore, when the accelerator pedal 31 is depressed, the current value of the electric signal sent to the ECU 40 changes according to the stroke amount, whereby the ECU 40 can recognize the stroke amount of the accelerator pedal 31.

On the other hand, as shown in FIG. 4, the ECU 40 includes a CPU 41, a ROM 42, a RAM 43, a backup RAM 44, a timer 45, and a microcomputer in which an I / O interface 46 is connected to each other via a bus line 47. , And its peripheral circuits. Then, it processes signals from the sensors such as the vehicle speed sensor 10, the oil temperature sensor 68, the potentiometer 34, and the key switch 30, and sends control signals to the electronic governor device 19 and actuators such as the injector 21 and the throttle valve 23. I do.

The I / O interface 46 includes the vehicle speed sensor 10 and the engine speed sensor 35, and the waveform shaping circuit 4
8 are connected. Further, the intake air temperature sensor 67, the throttle valve 23 (DC motor 63), the pressure sensor 26, the oil temperature sensor 68, the key switch 30, and the potentiometer 34 are connected to the I / O interface 46 via the A / D converter 49, respectively. It is connected to the. Further, the I / O interface 46 includes the injector 21, the throttle valve 23, the starter generator 2
7. The electronic governor device 19 and the like are connected via the drive circuit 50.

The ROM 42 stores a control program and various control fixed data, and also stores an engine start program and a maximum speed prescribed value for the cart. The RAM 43 stores input signals from sensors and switches after data processing, output signals to the injector 21 and the like, data processed by the CPU 41, and the like. Then, in the CPU 41, R
According to the control program stored in the OM 42, the control of the throttle valve 23 and the electronic governor device 19 is performed based on the output values of the vehicle speed sensor 10, the potentiometer 34, the oil temperature sensor 68, and the like, in addition to the air-fuel ratio control and the ignition timing control. Then, the engine start control and speed control of the cart are executed.

FIG. 5 is a block diagram showing a main functional configuration related to speed control in the ECU 40. As shown in FIG. 5, the ECU 40 has the following functional means as one of the activation control devices of the working vehicle. That is, the ECU 40 determines the opening degree of the throttle valve 23 based on the accelerator stroke amount detected by the potentiometer 34 and the detection values of the vehicle speed sensor 10 and the oil temperature sensor 68, and the vehicle speed sensor 10 Current detected vehicle speed V ₀ and ROM
A vehicle speed comparing means 52 for comparing with a maximum speed specified value Vmax stored in the storage device 42;
The vehicle speed limiting means 53 sends a speed limiting signal to the electronic governor device 19 when it is equal to or greater than し x and limits the opening of the throttle valve 23 by the electronic governor device 19.

Next, speed control by these functional means will be described. In the cart, the opening of the throttle valve 23 is normally calculated by the throttle valve opening calculating means 51 based on the accelerator stroke amount detected by the potentiometer 34, and the DC motor 63 is driven according to the calculated value to drive the throttle valve 23. Is opened. This supplies air to the intake system of the engine 1,
The engine 1 is driven by a mixture with the fuel supplied from the injector 21.

On the other hand, when the key switch 30 is in the ON state, the vehicle speed comparison means 52 always detects the detected value (V ₀ ) from the vehicle speed sensor 10 and the maximum speed specified value Vmax (for example, 15 km).
/ h), and when the running speed of the cart exceeds a specified value, a signal to that effect is sent to the vehicle speed limiting means 53. The vehicle speed limiting means 53 receiving this signal sends a speed limiting signal to the electronic governor device 19 so as to reduce the vehicle speed to less than the specified value, and the electronic governor device 19 controls the throttle valve 23.
Limit the degree of opening. That is, the electronic governor device 19 that has received the speed limit signal drives the DC motor 63 irrespective of the accelerator stroke amount to decrease the opening of the throttle valve 23. As a result, the amount of air supply to the engine 1 is reduced, the engine speed is suppressed, and the cart is controlled so as not to reach the maximum speed specified value Vmax.

In this case, the cart uses the vehicle speed sensor 10.
Is disposed in front of the differential device 61, and the vehicle speed can be detected without being affected by the differential action of the differential device 61. That is,
Even when the axle 62 has different rotation speeds on the left and right, such as when traveling on a curve, the vehicle speed is detected not by the rotation of the axle 62 but by the input shaft 6 in front of the differential device, so that accurate vehicle speed detection can be performed. In addition, since the vehicle speed can be detected by pulse counting, it is possible to improve the accuracy of the maximum speed control.

The maximum speed prescribed value Vmax is equal to RO
Since it is stored in M42, it cannot be easily rewritten on the user side, but the specified value can be changed by replacing ROM42. It is possible to easily change the speed limit. Therefore, unlike the conventional mechanical governor device, the adjustment can be easily performed on the user side, but there is no trouble that a complicated adjustment operation is required to accurately set the speed limit.

Next, control at the time of starting the cart will be described. At the time of starting the cart, first, when the key switch 30 is turned ON, the throttle valve opening calculating means 51 acquires the current engine temperature from the oil temperature sensor 68. Next, the throttle valve opening calculating means 51
Referring to the activation control map stored in the ROM 42,
The optimum opening of the throttle valve 23 at this temperature, that is, the throttle opening at which the engine 1 reliably and completely explodes in a short time is calculated. Then, a command is issued to the DC motor 63 to control the throttle valve 23 to its opening degree. At this time, when accelerator pedal 31 is depressed to the engine start position, starter generator 27 is driven and the engine is started.

In this case, in the cart, the opening of the throttle valve 23 is adjusted by the throttle valve opening calculating means 51 to be small when the engine temperature is low and large when the engine temperature is high. Therefore, the throttle valve 23
However, when the engine is cold, it is set to a slightly open state (for example, 10 °) than the fully closed state, and the engine 1 can be started in a complete explosion state. At this time, the throttle valve 23 is gradually opened thereafter according to the engine temperature regardless of the depression amount of the accelerator pedal 31, and the engine 1 is driven at a throttle opening corresponding to the temperature. When the engine 1 is sufficiently warmed up, normal control based on the amount of depression of the accelerator is performed.

As described above, in the cart, the engine 1
Can be started while maintaining the complete explosion state, so that the engine 1 can be quickly started even in a cold state. Therefore, it is possible to minimize the slippage on the slope due to the engine start time lag after the parking brake is released, and it is possible to improve the safety and driving feeling of the vehicle.

(Embodiment 2) Next, as Embodiment 2 of the present invention, a cart will be described in which the engine starting position of the accelerator pedal is changed according to the leaning state of the vehicle. In the cart, a tilt sensor (tilt detecting means) 70 for detecting the tilt amount is provided on the cart, and when starting on a slope, the engine is started with an accelerator stroke amount smaller than that on a flat ground according to the tilt amount, and the time lag is increased. It is intended to shorten the time. The configuration other than the inclination sensor 70 is the same as that of the first embodiment, and details of those members, functional units, and the like are omitted.

FIG. 6 is an explanatory diagram showing the configuration of a golf cart provided with a start-up control device according to Embodiment 2 of the present invention. In this embodiment, as shown in FIG. 6, a tilt sensor 70 is installed substantially at the center of the cart. As the tilt sensor 70, a potentiometer or a tilt meter using mercury is used, and its detection data (vehicle tilt amount) is used.
Is sent to the ECU 40. In the ECU 40, the detected vehicle inclination amount is taken into the RAM 43 via the A / D converter 49 and the I / O interface 46, similarly to the data from the oil temperature sensor 68 and the like. The data is sent to the CPU 41, and the CPU 41 sets an engine start position of the accelerator pedal 31 with reference to a map stored in the ROM 42 based on the value.

FIG. 7 is a block diagram showing a functional configuration relating to the engine start position control of the ECU 40. As shown in FIG. 7, the data from the inclination sensor 70 is sent to the engine start position setting means 54, where the engine start angle θs is calculated with reference to the map in the ROM 42. At this time, the engine starting position setting means 54 sets the engine starting angle θs based on the map such that the greater the cart inclination amount, the smaller the stroke amount of the accelerator pedal 31 until reaching the engine starting position. Then, this value is sent to the starter generator driving means 55.

On the other hand, starter generator driving means 55
Indicates that the stroke amount (angle θ) of the accelerator pedal 31 is constantly obtained from the potentiometer 34. When this reaches the previously set engine start angle θs, the starter generator 27 is driven to start the engine 1.

That is, the engine starting position of the accelerator pedal 31 on flat ground (tilt angle 0 °) is set to θ ₀ (for example, 2
0 °), the inclination sensor 70 sets the cart to 15
When the information that the vehicle is on the gradient of ° is obtained, the engine starting position setting means 54 sets the engine starting angle θs to θ ₁₅ (for example, 10 °). Thus, on a flat ground, the engine 1 starts when the accelerator pedal 31 is depressed by 20 °, whereas when the cart is started on a slope, the engine starts when the pedal is depressed by 10 °. Therefore, for example, if the parking brake is released when the pedal is depressed by 5 °, 15
The engine 1 is started up by ° minutes earlier, and the time lag after the brake is released can be further reduced.
Therefore, when the vehicle is started on a slope, the above-described slippage can be minimized, and the safety and driving feeling of the vehicle can be improved. Needless to say, when the starter generator 27 is operated, the throttle opening control according to the first embodiment is more effective.

The present invention is not limited to the above-described embodiment, and it goes without saying that various changes can be made without departing from the scope of the present invention.

For example, in the above-described embodiment, the engine temperature is detected by using the oil temperature sensor 68 to control the throttle opening at the time of starting, but the intake air temperature sensor 67 controls the temperature of the intake air. It is also possible to detect the outside air temperature and verify the warm-up state of the engine in more detail to control the throttle opening. In this case, the throttle valve opening calculating means 51 further receives the signal from the intake air temperature sensor 67 and determines the throttle opening based on the signal. The detection of the outside air temperature may be performed not by the intake air temperature sensor 67 but by an outside air temperature sensor separately provided at any position on the vehicle body.

In the above-described embodiment, the cart equipped with the electronic governor device 19 has been described as an example, but it is not always necessary to provide the electronic governor device. further,
Although a DC motor is used as the driving means of the electric throttle, other actuators such as a stepping motor which can control the driving amount can be used as the throttle driving means.

In addition, although a golf cart has been described as an example of a working vehicle, the application object is not limited to a golf cart, but may be an autonomous traveling work vehicle used for mowing a golf course or a garden, spraying a liquid agent, or the like. The present invention is also applicable to various work vehicles such as a mower, a snow blower, and a construction machine.

[0054]

According to the starting control device of the present invention, it is possible to optimally control the throttle valve opening at the time of starting based on the engine temperature, and it is possible to shorten the time until the engine is started. Therefore, when starting the cart on a slope, it is possible to minimize the slipping phenomenon that occurs due to the time lag between the release of the parking brake and the start of the engine, thereby improving vehicle safety and driving feeling. Can be planned.

When the engine is started from a cold state, the opening of the throttle valve is limited so that the engine is completely exploded, so that the engine can be started quickly even in a cold state. It becomes possible.
Therefore, the time lag, which is particularly conspicuous in starting in a cold state, can be minimized, and the slip-down phenomenon at that time is also minimized.

Further, since the opening of the throttle valve is controlled not only by the engine temperature but also by the intake air temperature, more accurate engine start control can be performed.

On the other hand, by detecting the amount of inclination of the cart and setting the engine start position of the accelerator pedal based on the amount of inclination, the amount of depression of the accelerator pedal until the start of the engine is changed according to the inclination. Thus, it is possible to reduce the time required for starting the engine when starting on a slope.

In this case, if the engine start position is set such that the stroke amount of the accelerator pedal until reaching the engine start position becomes smaller as the inclination amount becomes larger, the engine can be started with less stepping margin than on a flat ground when starting on an inclined ground. Since the engine is started, the time lag from the release of the brake to the start of the engine is reduced, and slipping when the vehicle starts on a slope can be minimized.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating a configuration of a golf cart including a start-up control device according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an attached state of an injector device and an electronic governor device in an engine mounted on the golf cart of FIG. 1;

FIG. 3 is an explanatory diagram showing a schematic configuration of a stroke amount detection mechanism of an accelerator pedal in the golf cart of FIG. 1;

FIG. 4 is a circuit configuration diagram of an electronic control system in the golf cart of FIG. 1;

FIG. 5 is a block diagram showing a main functional configuration related to speed control in an ECU.

FIG. 6 is an explanatory diagram illustrating a configuration of a golf cart including a start-up control device according to Embodiment 2 of the present invention.

FIG. 7 is a block diagram showing a main functional configuration related to engine start position control in an ECU.

[Explanation of symbols]

Reference Signs List 1 engine (internal combustion engine) 19 electronic governor device 23 throttle valve 27 starter generator (starter) 31 accelerator pedal 34 potentiometer (accelerator stroke amount detecting means) 40 ECU 41 CPU 51 throttle valve opening calculating means 52 vehicle speed comparing means 53 vehicle speed limiting means 54 Engine start position setting means 55 Starter generator driving means (Starter driving means) 63 DC motor (Valve driving means) 67 Intake air temperature sensor (Intake air temperature detection means) 68 Oil temperature sensor (Engine temperature detection means) 69 Brake pedal V ₀ Vehicle speed Vmax Maximum speed specified value θs Engine start angle

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Akihiro Hanai 1-1-1, Kyowa-cho, Obu-shi, Aichi Prefecture Inside Ai San Industry Co., Ltd. (72) Satomi Wada 1-1-1, Kyowa-cho, Obu-shi, Aichi Prefecture 1 Ai San Kogyo Co., Ltd. (72) Inventor Mikio Hamada 1-1-1 Kyowa-cho, Obu City, Aichi Prefecture F-term in Ai San Kogyo Co., Ltd. 3G093 AA06 AA08 AA10 AA16 BA04 BA07 CA01 CB05 DA04 DA06 DB05 DB09 DB18 EA09 EC02 FB02 FB05 3G301 HA01 HA28 JA00 JA35 KA02 KB01 LA03 LB02 ND01 NE17 NE20 PA10Z PE08Z PF01Z PF03Z

Claims (6)

[Claims] 1. A starting control device for a working vehicle, comprising: an internal combustion engine; and valve driving means for driving a throttle valve of the internal combustion engine, wherein the engine temperature detecting means detects a temperature of the internal combustion engine. Calculating an opening degree of the throttle valve when starting the internal combustion engine based on the internal combustion engine temperature detected by the engine temperature detecting means, and setting the throttle valve to have the calculated opening degree. A starting control device for a working vehicle, comprising: a throttle valve opening calculating means for operating a valve driving means. 2. The activation control device according to claim 1, wherein
The work vehicle, wherein the throttle valve opening calculating means limits the opening of the throttle valve so that the internal combustion engine is brought to a complete explosion state when the internal combustion engine is started from a cold state. Start control device. 3. The startup control device according to claim 1, wherein the startup control device further includes an intake air temperature detection unit that detects an intake air temperature of the engine, and the throttle valve opening calculation unit includes: A starting control device for a working vehicle, wherein the opening degree of the throttle valve is calculated based on an internal combustion engine temperature and an intake air temperature. 4. The starting control device according to claim 1, wherein said engine temperature detecting means is an oil temperature sensor for detecting a lubricating oil temperature of said internal combustion engine. Vehicle start control device. 5. A start-up control device for a working vehicle that is equipped with an internal combustion engine and that starts the internal combustion engine when an accelerator pedal is depressed to an engine start position, wherein the inclination detecting device detects a lean amount of the work vehicle. Detecting means; accelerator stroke amount detecting means for detecting the depression amount of the accelerator pedal; and engine starting position setting means for setting the engine starting position based on the vehicle tilt amount detected by the tilt detecting means. A start-up control device for a working vehicle, characterized in that: 6. The activation control device according to claim 5, wherein
The starting of the work vehicle, wherein the engine starting position setting means sets the engine starting position such that the stroke amount of the accelerator pedal until reaching the engine starting position decreases as the vehicle lean amount increases. Control device.