JP7328909B2 - vehicle - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle equipped with a tank that is mounted on the vehicle body and stores liquid.

Patent Literature 1 discloses a vehicle capable of discharging water. This vehicle has a tank for loading water, a pump for discharging the liquid in the tank or sucking the liquid into the tank, and a water discharger that uses the output of the engine to drive the pump and discharge water. It has (for example, see patent document 1).

Vehicles that perform this type of water spraying generally include a spraying switch that starts spraying by the water sprayer, and an engine speed adjustment switch that adjusts the engine speed to adjust the amount of water sprayed by the water sprayer. By operating the engine rotation speed adjustment switch to any position from high rotation to low rotation, it is possible to set the water discharge amount according to the work.

By the way, there is a case where the work is finished while the engine speed adjustment switch is set to high speed. In that case, when the spray switch is pressed during the next work, the engine is suddenly driven at high speed, so the pump receives a large output from the engine and starts. As a result, it causes damage or failure of the pump, and an early improvement is desired.

Japanese Patent No. 4224501

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a vehicle capable of preventing the pump from being started with a large output from the engine.

The vehicle of the present invention comprises a tank mounted on the vehicle body for loading a liquid, a mechanism for discharging the liquid in the tank or sucking the liquid into the tank, and control for driving and controlling the mechanism with the output of the engine. , wherein the control unit includes a first mode in which the output of the engine follows an instructed instruction value to drive the mechanism; Mode switching means for switching between a second mode for driving the mechanism is provided, and the mode switching means switches to the second mode before switching to the first mode when a command signal for driving the mechanism is output. It is characterized by switching to

According to the present invention, when a command signal for driving the mechanism is output and, for example, water is discharged, the mechanism is driven in accordance with the output of the engine by switching the mode switching means to the second mode. By the way, when the liquid in the tank is discharged to discharge water or the liquid is sucked into the tank, the vehicle is often driven at a low speed or stopped. Therefore, it is possible to prevent the pump from being started with a large output from the engine. When the mode is switched from the second mode to the first mode, the output of the engine follows the indicated value, and the pump is driven by the following engine output.

Further, in the vehicle of the present invention, when the control unit is driving the mechanism in the second mode, the output of the engine based on the instruction value is compared with a preset threshold value, and the The second mode may be switched to the first mode when the output of the engine is smaller than a threshold value.

As described above, if the second mode is switched to the first mode when the output of the engine based on the indicated value is smaller than the threshold, the pump can be driven with a large output from the engine even after switching. can be prevented.

Further, in the vehicle of the present invention, when the control unit is driving the mechanism in the second mode, the output of the engine based on the instruction value is compared with a preset threshold value, and the The operator may be notified when the output of the engine is greater than a threshold value.

According to the above configuration, if the operator is notified when the engine output based on the indicated value is greater than the threshold, the operator who notices it can change the engine output to be equal to or less than the threshold.

Further, in the vehicle of the present invention, when the control unit is driving the mechanism in the second mode, the output of the engine based on the instruction value is compared with a preset threshold value, and the The second mode may be switched to the first mode after the output of the engine is set to be equal to or less than the threshold when the output of the engine is greater than the threshold.

According to the above configuration, when the output of the engine based on the indicated value is greater than the threshold, if the second mode is switched from the second mode to the first mode after the output of the engine is set to the threshold or less, the pump can be kept from the engine even after switching. It is possible to prevent it from being driven with a large output.

The present invention prevents the pump from being started with a large output from the engine by configuring to switch to the second mode before switching to the first mode when a command signal to drive the mechanism is output. We can provide a vehicle that can

It is the whole tank car side view. It is a block diagram showing the control configuration of the present invention. It is a flow chart which shows the 1st control at the time of performing water discharge. FIG. 4 is a flow chart showing control when the engine speed differs from the indicated value in FIG. 3 ; FIG. It is a flow chart which shows the 2nd control at the time of performing water discharge.

A tank car as a vehicle according to one embodiment of the present invention will be described below with reference to FIG. The tank truck 1 has a driver's cab 3 in which an engine 2 as a driving source for traveling is mounted at the bottom, a tank 5 mounted on a frame 4 and long in the front-rear direction for carrying water for water discharge, and water in the tank 5. Equipped with a pump 6 that is a mechanism for discharging or sucking water into the tank 5, and a front water discharge nozzle 7 and a rear water discharge nozzle 8 for discharging water by pumping water through pipes by driving the pump 6. there is

The pump 6 is driven by the output of the engine 2, and the pump 6 is driven in accordance with the output (rotational speed) of the engine 2 according to the depression amount of an accelerator pedal (not shown) provided in the driver's cab 3. In other words, if the amount of depression of the accelerator pedal is increased, the pump 6 is driven with a large output (high rotation speed) of the engine 2, and if the amount of depression of the accelerator pedal is decreased, the output of the engine 2 is small (low rotation speed). Pump 6 is driven. This drive is called a second mode. In the second mode, the control unit 12 ignores instructions input from the engine speed setting switch 9 and drives the pump 6 with the output (rotational speed) of the engine 2 corresponding to the depression amount of the accelerator pedal. That is, in the second mode, feedforward control is performed in which the engine output is changed based on the depression amount of the accelerator pedal.

Further, the control unit 12 obtains an instruction value (here, the engine speed) indicated by the engine speed setting switch 9 shown in FIG. The pump 6 is driven by the output of the engine 2 to follow. This drive is called the first mode. In this first mode, the control unit 12 detects the engine speed from the engine 2, and adjusts the engine speed to the indicated value by increasing or decreasing the speed of the engine 2 based on the detected engine speed. Feedback control is performed as follows.

FIG. 2 is a block diagram showing a control configuration when water is discharged. The water discharge switch 10, the engine speed setting switch 9, and the engine speed detection means 11 shown in FIG.

The water discharge switch 10 is a switch that is turned on when water discharge from the front water discharge nozzle 7 and the rear water discharge nozzle 8 is started. The water discharge switch 10 includes a switch (not shown) for the front water discharge nozzle 7 and a switch (not shown) for the rear water discharge nozzle 8. In this embodiment, one water discharge switch is provided. 10.

The engine speed setting switch 9 is a switch for increasing or decreasing the engine speed when increasing or decreasing the amount of water discharge. A toggle switch or the like that changes the number of revolutions step by step may be used.

The engine speed detection means 11 may be composed of a sensor that detects the number of revolutions of the crankshaft per predetermined time, a sensor that measures the magnitude of vibration of the engine 2 to measure the number of revolutions of the engine, A sensor or the like that determines the engine speed from the output voltage of a generator that generates power when the engine 2 is driven may be used. A control unit 12 drives and controls the engine 2 so that the engine speed detected by the engine speed detection means 11 becomes an indicated value indicated by the depression amount of the accelerator pedal or the rotational position of the engine speed setting switch 9. .

The control unit 12 includes mode switching means 13 for switching between the first mode and the second mode. The mode switching means 13 is configured to switch to the second mode before switching to the first mode when the controller 12 receives a command signal for driving the pump 6 by turning on the water discharge switch 10 . .

As described above, when the control unit 12 receives a command signal for driving the pump 6 and discharges water, the mode switching means 13 switches to the second mode, thereby ignoring the instruction from the engine speed setting switch 9. Then, the pump 6 is driven according to the output of the engine 2 according to the depression amount of the accelerator pedal. By the way, when the liquid in the tank 5 is discharged to discharge water or the liquid is sucked into the tank 5, the vehicle is often driven at a low speed or stopped. Therefore, it is possible to prevent the pump 6 from being started with a large output from the engine 2, thereby avoiding damage or failure of the pump 6. When the second mode is switched to the first mode, the output of the engine 2 follows the command value (engine speed) indicated by the engine speed setting switch 9, and the pump 6 is driven by the following engine output. driven.

Further, while driving the pump 6 in the second mode, the control unit 12 compares the output of the engine 2 based on the instruction value with a preset threshold value, and based on the instruction value (here In this configuration, the second mode is switched to the first mode when the output of the engine 2 indicated by the engine speed setting switch 9 is smaller than a threshold value.

As described above, if the second mode is switched to the first mode when the output of the engine 2 based on the indicated value is smaller than the threshold value, the pump 6 can generate a large output from the engine 2 even after switching. It can be prevented from being driven. The threshold may be set to any value as long as the engine 2 rotates at a speed lower than the maximum rotation speed. May be set.

Further, while driving the pump 6 in the second mode, the control unit 12 compares the output of the engine 2 based on the instruction value with the threshold, and if the output of the engine 2 is greater than the threshold, , is configured to notify the operator.

As described above, when the output of the engine 2 based on the indicated value (here, indicated by the engine speed setting switch 9) is greater than the threshold value, if the operator is notified, the operator who has noticed the engine 2 (indicated value indicated by the engine speed setting switch 9) can be made below the threshold value.

Further, while driving the pump 6 in the second mode, the control unit 12 compares the output of the engine 2 based on the instruction value with the threshold, and if the output of the engine 2 is greater than the threshold, In addition to notification to the operator, the second mode may be switched to the first mode after the output of the engine 2 is reduced to the threshold value or less.

As described above, when the output of the engine 2 is greater than the threshold, the output of the engine 2 (indicated value indicated by the engine speed setting switch 9) is made equal to or less than the threshold, and then the mode is changed from the second mode to the first mode. By switching, it is possible to prevent the pump 6 from being driven with a large output from the engine 2 even after switching.

The actual water discharge control when water is discharged by the tank truck having the above configuration will be described based on the flow chart shown in FIG.

First, the control unit 12 confirms whether or not the water discharge switch 10 has been turned on (step S1), and if it has been turned on, determines that a command signal for driving the pump 6 has been received, and switches to the second mode (step S2). ). When the mode is switched to the second mode, the signal from the engine speed setting switch 9 is ignored and the pump 6 is driven according to the output of the engine 2 according to the depression amount of the accelerator pedal (step S3). If the vehicle is traveling, the vehicle is traveling at a low speed, so the pump 6 is driven at a low rotational speed of the engine 2 corresponding to the low speed. Next, the engine speed, which is the output value of the engine 2 based on the indicated value, is compared with a preset threshold (engine speed) (step S4), and it is determined that the engine speed is equal to or less than the threshold. Then, the mode is switched to the first mode (step S5). After switching to the first step mode, it is checked whether the engine speed matches the indicated value (step S6). If they do not match, as shown in FIG. 4, it is checked whether the indicated value is greater than the engine speed (step S11). If the indicated value is higher than the engine speed, the engine speed is increased (step S12). When the indicated value is smaller than the engine speed, the engine speed is decreased (step S13). After that, returning to step S6 in FIG. 3, it is confirmed again whether the engine speed matches the indicated value. If they match, the process proceeds to the next determination, and if they do not match, the process of FIG. 4 is repeated. If they match, it is checked whether the engine speed setting switch 9 has been operated (step S7). number (step S8). After that, it is checked whether or not the water discharge switch 10 is turned off (step S9), and when the water discharge switch 10 is turned off, the water discharge control ends. When the water discharge is finished, the indicated value of the engine speed setting switch 9 is stored in the storage section provided in the control section 12 . If it is determined in step S4 that the engine speed is greater than the threshold value, the operator is notified (step S10), and the water discharge control ends. The operator, who notices the notification, lowers the indicated value of the engine speed setting switch 9 to make the output of the engine (engine speed) based on the indicated value equal to or lower than the threshold value, and then restarts the water discharge. Any means such as sounding a buzzer, turning on a warning light, displaying a message on the display unit, or the like may be used as an informing means for informing the operator.

In FIG. 3, when it is determined in step S4 that the engine speed is greater than the threshold value, the operator is notified of this. That is, in FIG. 5, when it is determined in step S4 that the engine output (engine speed) corresponding to the indicated value indicated by the engine speed setting switch 9 is greater than the threshold value, the control unit 12 The output (engine speed, indicated value indicated by the engine speed setting switch 9) is set to the starting speed below the threshold (step S14). It should be noted that the starting rotational speed is a value set in advance and stored in the control unit 12 as a value equal to or less than the threshold value. After that, the mode is switched to the first mode (step S4), and the processing from steps S6 to S9 similar to FIG. 3 is performed. Further, in the same manner as described above, the processing from steps S11 to S13 is performed until the indicated value=engine speed in step S6.

When the liquid (here, water) in the tank 5 is discharged, the water can be discharged not only while the vehicle is running but also while the vehicle is stopped. Also, when the liquid (here, water) is sucked into the tank 5, it is done while the vehicle is stopped. When the vehicle is stopped, the engine speed is the idling speed. Therefore, the second mode is switched to the first mode based on the output signal (parking brake ON signal) from the parking brake. You may

The present invention can be modified in various ways without departing from the scope of the invention. In addition, the specific configuration of each part is not limited to the above embodiment. For example, the vehicle of the present invention is not limited to a tank truck equipped with a pump, but includes a tank truck capable of loading liquids such as gasoline, light oil, and kerosene. can.

In the above embodiment, the pump 6 is driven by the output of the engine 2 as the drive source for running, but the pump 6 may be driven by an engine other than the engine 2 as the drive source for running. Moreover, the engine of the tank truck 1 may be not only an internal combustion engine but also an electric motor (so-called electric vehicle), or may use both an internal combustion engine and an electric motor (hybrid vehicle).

Further, in the above embodiment, the electric pump 6 is used as a mechanism for discharging the liquid in the tank 5 or sucking the liquid into the tank 5, but a diaphragm pump may be used.

Further, in the above embodiment, the engine speed is set by the engine speed setting switch 9, but the keyboard for inputting the engine speed or the up-down switch for raising or lowering the engine speed may be used for setting. good. Further, as the instruction value (engine speed) instructed after the start of work, the previous instruction value may be used, or a new instruction value input each time the water discharge work is performed may be used.

DESCRIPTION OF SYMBOLS 1... Tank truck, 2... Engine, 3... Driver's cab, 4... Frame, 5... Tank, 6... Pump (mechanism), 7... Front water discharge nozzle, 8... Rear water discharge nozzle, 9... Engine speed setting switch, 10 ... water discharge switch, 11 ... engine speed detection means, 12 ... control section, 13 ... mode switching means

Claims (4)

A tank mounted on a vehicle body and loaded with liquid, a mechanism for discharging the liquid in the tank or sucking the liquid into the tank, and a control section for driving and controlling the mechanism with the output of the engine. a vehicle that is
The control unit has a first mode in which the output of the engine follows an instruction value instructed by the instruction means for instructing the output of the engine to drive the mechanism, and an accelerator operation mode in which the instruction from the instruction means is disregarded. Mode switching means for switching between a second mode for driving the mechanism in accordance with the output of the engine according to the amount of depression of the pedal , the mode switching means providing a command signal for the control unit to drive the mechanism. is received, the vehicle switches to the second mode before switching to the first mode. The control unit compares the output of the engine based on the instruction value instructed by the instruction means with a preset threshold value when the mechanism is driven in the second mode, and determines the output of the engine. 2. The vehicle of claim 1, wherein the vehicle is configured to switch from the second mode to the first mode when the output is less than a threshold. The control unit compares the output of the engine based on the instruction value instructed by the instruction means with a preset threshold value when the mechanism is driven in the second mode, and determines the output of the engine. 2. The vehicle of claim 1, configured to notify an operator when the output is greater than a threshold. The control unit compares the output of the engine based on the instruction value instructed by the instruction means with a preset threshold value when the mechanism is driven in the second mode, and determines the output of the engine. 2. The vehicle according to claim 1, wherein when the output is greater than a threshold, the second mode is switched to the first mode after reducing the output of the engine to the threshold or less.