JP2001333504A - Running and driving gear for industrial vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a running and driving gear for vehicles with the improved fuel consumption of engine. SOLUTION: The running and driving gear comprises a motor 1 for traveling supplied with power from a generator 12 coupled with an engine 11, an inverter 3 that is provided with a revolution speed-torque characteristic curve with the low revolution speed range set to constant torque, and a second revolution speed-torque characteristic curve, where the torque in the low revolution speed range is limited in inverse proportion to revolution speed and controls the torque of the motor 1 according to either characteristic curve, and a mode-of-operation switch 31 for inputting a mode of operation for flatland traveling. The running and driving gear is so constituted, that when the mode of operation for flatland traveling has been inputted through the switch 31, the gear selects the second revolution speed-torque characteristic curve and controls the torque of the motor 1 according to the angle of accelerator pedal operation. According to this constitution, the torque is limited, and load on the engine 11 is alleviated in the low revolution speed range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving device for an industrial vehicle.

[0002]

2. Description of the Related Art In an industrial vehicle (for example, a container carrier or a traveling vehicle), a generator is driven by driving a diesel engine, and an electric motor connected to wheels is used by using electric power generated by the generator. 2. Description of the Related Art A traveling drive device called a diesel-electric system has been developed which drives a vehicle by driving.

FIG. 4 is a block diagram of a conventional driving device for an industrial vehicle using the diesel-electric driving device. In FIG. 4, reference numeral 1 denotes an induction motor (an example of an electric motor) in which the rotation shaft is connected to the shaft of each of the left and right rear wheels (or front wheels) 2. Further, an inverter (an example of a traveling drive unit) 3 for driving each of the motors 1 is provided, and a braking resistor 4 for consuming the regenerative braking energy of the motor 1 is provided in each of the two inverters 3.
The motor 1 is further provided with a rotation speed detector (rotation speed detector) 5 for detecting the rotation speed of the motor 1. Each inverter 3 controls the motor 1 according to a torque command value of the motor 1 input from a control device 6 described later.
Is performed.

[0004] In FIG. 4, reference numeral 11 denotes a diesel engine (an example of an engine serving as a driving source for a plurality of operations). Each shaft such as a hydraulic pump 13 for supplying pressure oil to the hydraulically driven cargo handling device 7 is connected. When the engine 11 rotates, electric power is generated in the generator 12, and the hydraulic pump 13 supplies the cargo to the cargo handling device 7. Pressure oil is supplied. Also diesel engine 11
Is rotated at 1800 rpm to obtain a 60 Hz alternating current.

The generator 12 has its field current controlled by a generator voltage regulator (AVR) 14 so that the generated voltage is constant. The power generated by the generator 12 is Power is supplied to the two inverters 3 and the motor 1 via the inverter 15. In FIG. 1, reference numeral 18 denotes a battery for starting the engine 11, the generator 12, and the control device 6.

Reference numeral 20 denotes an accelerator pedal (or an operation lever corresponding to the accelerator pedal). The depression angle of the accelerator pedal 20 is detected by an angle detector 21 and the operation angle (for example, 10 to 50 ° / 0 to 100). %)
Is output to the control device 6, and the control device 6
Calculates the torque command value of the motor 1 in accordance with the operation angle of the accelerator pedal corresponding to the inputted depression amount of the accelerator pedal, and outputs the calculated torque command value of the motor 1 to the inverter 3.

FIG. 5 shows a rotation speed-torque characteristic curve of the motor 1 set in the inverter 3. This rotation speed-
The torque characteristic curve is obtained by setting an effective traveling power obtained by subtracting the power other than the traveling power from the output of the engine 11 by the efficiency of each part as a rotation speed-torque characteristic curve. The rotation speed region is set to a constant high torque (constant torque region), and in a region beyond the low rotation speed region, the torque is set to decrease according to the constant output. Thereby, the output of the engine 11 can be effectively used for driving the traveling motor.

The operation of the above configuration will be described. engine
When the engine 11 is started, the engine 11 is rotated at a constant rotation speed of 1800 rpm, whereby the hydraulic pump 13 is driven, and the generator 12 starts generating electricity. Also AVR14
Thus, the generated voltage is controlled to be constant. The field current of the generator 12 is supplied from the battery 18 at the time of startup, and is supplied from its own generated current after startup.

When the accelerator pedal 20 is depressed and the operation angle thereof is detected by the angle detector 21 and is input to the control device 6, the torque of the traveling motor 1 corresponding to the operation angle is obtained and output to each inverter 3. Is done. That is, the rotation speed-torque characteristic curve shown in FIG.
It is raised and lowered by the operation angle of.

Each inverter 3 controls the torque of the motor 1 in accordance with the input torque command value and the set rotation speed-torque characteristic curve, and the running speed of the vehicle is determined at the intersection of the rotation speed-torque characteristic curve and the load curve. Controlled.
At this time, necessary active power is supplied from the generator 12.

[0011]

However, when the torque control is performed in accordance with the above-mentioned rotational speed-torque characteristic curve, power can always be supplied to the traveling motor 1 up to the maximum load of the engine 11, so that rapid acceleration such as when working on level ground is performed. There is a problem that the fuel economy of the engine 11 is deteriorated when the operation with many operations is performed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a driving device for a diesel-electric running vehicle with improved fuel efficiency of an engine.

[0013]

According to one aspect of the present invention, an engine serving as a driving source for a plurality of operations and a generator connected to the engine are provided. A traveling drive device for an industrial vehicle capable of performing the plurality of operations, comprising a traveling electric motor to which power is supplied, and having a rotation speed-torque characteristic curve of the electric motor corresponding to the operation for each operation. Traveling drive means, an accelerator pedal for inputting the operation amount of the electric motor or a lever corresponding to the accelerator pedal, and input means for selecting and inputting one of the plurality of operations,
A configuration in which a rotation speed-torque characteristic curve that matches the operation is selected by the operation input by the input means, and torque control of the electric motor is performed according to the operation amount of the accelerator pedal or a lever corresponding to the accelerator pedal. It is characterized by having.

According to the above construction, a rotation speed-torque characteristic curve corresponding to the work is selected by the work input by the input means, and the rotation speed-torque characteristic curve is selected according to the operation amount of the accelerator pedal or a lever corresponding to the accelerator pedal. The torque control of the electric motor is performed. As described above, since the rotation speed-torque characteristic curve that matches the work is selected, the power is used most effectively, and the load on the engine is reduced.

According to a second aspect of the present invention, it is possible to execute the plurality of operations, comprising an engine serving as a driving source for the plurality of operations, and a traveling electric motor supplied with power from a generator connected to the engine. A traveling drive device for an industrial vehicle, wherein the electric motor controls traveling torque according to a rotational speed-torque characteristic curve in which a low rotational speed region is set to a constant torque, and an operation amount of the electric motor. An accelerator pedal for inputting or a lever corresponding to the accelerator pedal, and an input means for inputting a work mode for level terrain travel, wherein the traveling drive means limits the torque in the low rotational speed range in inverse proportion to the rotational speed. Second rotation speed-
A torque characteristic curve is set, and when the work mode of flatland traveling is input by the input means, the second rotation speed-torque characteristic curve is selected, and the operation of the accelerator pedal or a lever corresponding to the accelerator pedal is selected. It is characterized in that the torque of the electric motor is controlled in accordance with the amount.

According to the above configuration, when the level terrain mode is input, the second rotation speed-torque characteristic curve in which the torque in the low rotation speed region is limited in inverse proportion to the rotation speed is selected. Torque control of the electric motor is performed according to the operation amount of the accelerator pedal or a lever corresponding to the accelerator pedal. Therefore, the torque is limited in the low rotation speed range as compared with the case where the normal rotation speed-torque characteristic curve is selected, and the load on the engine is reduced even in the rapid acceleration operation.

According to a third aspect of the present invention, it is possible to execute the plurality of tasks, comprising: an engine serving as a drive source for the plurality of tasks; and a traveling electric motor supplied with power from a generator connected to the engine. A traveling drive device for an industrial vehicle, wherein the electric motor controls traveling torque according to a rotational speed-torque characteristic curve in which a low rotational speed region is set to a constant torque, and an operation amount of the electric motor. An accelerator pedal for inputting or a lever corresponding to the accelerator pedal, and a forward / backward operation lever for selecting forward, neutral, or reverse of the vehicle, and the traveling drive means reverses the torque in the low rotational speed range to the rotational speed. A second rotational speed-torque characteristic curve restricted in proportion is set, and forward or reverse is selected by the forward / reverse operating lever, and the accelerator pedal or the accelerator pedal is selected. When the lever corresponding to the accelerator pedal is operated, the second rotation speed-torque characteristic curve is selected, and the torque control of the electric motor is performed according to the operation amount of the accelerator pedal or the lever corresponding to the accelerator pedal. It is characterized in that it is configured to perform.

According to the above construction, when forward or reverse is selected by the forward / reverse operation lever, and the accelerator pedal or a lever corresponding to the accelerator pedal is operated, the torque in the low rotational speed range is reduced to the rotational speed. A second rotational speed-torque characteristic curve restricted in inverse proportion is selected, and torque control of the electric motor is performed according to the operation amount of the accelerator pedal or a lever corresponding to the accelerator pedal. Therefore, the torque is limited in the low rotation speed range as compared with the case where the normal rotation speed-torque characteristic curve is selected, and the load on the engine is reduced even in the rapid acceleration operation.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. The same components as those of the conventional example shown in FIG. 4 are denoted by the same reference numerals, and description thereof is omitted.

FIG. 1 is a block diagram of a traveling drive device for an industrial vehicle according to an embodiment of the present invention. In FIG. 1, reference numeral 31 denotes a work mode switch (an example of an input means) provided on the operation panel 16, and one of a work mode in which only flat-land running is performed (hereinafter, referred to as a flat-land running mode) and a mode of cargo handling work. The selected signal is input to the control device 6 as a setting signal.

Reference numeral 32 denotes a forward / neutral / reverse forward / backward operation lever. The forward / neutral / reverse position operation signal is input to the control device 6. FIG. 2 shows a motor 1 newly set in an inverter (an example of a traveling drive unit) 3.
2 shows a rotation speed-torque characteristic curve of the present invention. This rotation speed-torque characteristic curve is a second rotation speed-torque characteristic curve selected by the inverter 3 in the above-mentioned flat road traveling mode, and the torque in the low rotation speed region in the rotation speed-torque characteristic curve of FIG. In the range that satisfies the specifications when traveling on level ground, the rotation speed is limited in inverse proportion to the rotation speed. Hereinafter, the rotation speed-torque characteristic curve shown in FIG. 2 will be referred to as a level ground running torque performance curve, and the rotation speed-torque characteristic curve shown in FIG. 5 will be referred to as a cargo handling torque performance curve.

The control device 6 includes an accelerator pedal angle detector
According to the operation angle of the accelerator pedal 20 detected by 21 (for example, 10 to 50 ° / 0 to 100%), the setting signal of the operation mode switch 31, and the position operation signal of the forward / reverse operation lever 32, the torque performance curve is One of them is selected, the command value of the torque of the motor 1 is calculated, and a control signal including a selection signal of the torque performance curve and the calculated torque command value of the motor 1 is output to each inverter 3.

The control of the control device 6 will be described with reference to the flowchart of FIG. It is checked whether the setting signal of the work mode switch 31 is the level terrain mode setting (step-1), the position operation signal of the forward / reverse operation lever 32 is the forward or reverse position, and the operation angle of the accelerator pedal 20 is 5%. The above (the accelerator pedal 20 is depressed) is confirmed (steps -2 and 3).

If any one of the steps 1 or 2 and 3 can be confirmed, a flat road running torque performance curve is selected (step 4), and the step
1. If none of them can be confirmed in steps -2 and 3, a cargo handling torque performance curve is selected (step -2).
5).

Next, the torque of the traveling motor 1 corresponding to the operation angle of the accelerator pedal 20 is determined (step-6), and the control consisting of the torque command value and the selection signal of the torque performance curve determined in step-4 or 5 is performed. A signal is output to each inverter 3 (step-7).

The operation of the above configuration will be described. engine
When the engine 11 is started, the engine 11 is rotated at a constant rotation speed of 1800 rpm, whereby the hydraulic pump 13 is driven, and the generator 12 starts generating electricity. Also AVR14
Thus, the generated voltage is controlled to be constant. The field current of the generator 12 is supplied from the battery 18 at the time of startup, and is supplied from its own generated current after startup.

When the setting signal of the work mode switch 31 is the level terrain mode setting, or when the position operation signal of the forward / reverse operation lever 32 is the forward or reverse position and the accelerator pedal 20 is depressed, the control device 6 ,
When the flat road running torque performance curve is selected as the rotation speed-torque characteristic curve, the accelerator pedal 20 is depressed, and the operation angle is detected by the angle detector 21, the torque of the running motor 1 corresponding to the operation angle is obtained. A control signal including the torque command value and a signal for selecting a flat-land running torque performance curve is output to each inverter 3. That is, FIG.
The rotation speed-torque characteristic curve of the flat road running torque performance curve shown in FIG.

Each of the inverters 3 determines the input torque command value and the rotation speed of the flat road running torque performance curve shown in FIG.
The torque of the motor 1 is controlled in accordance with the torque characteristic curve, so that the running speed of the vehicle is controlled at the intersection of the rotation speed-torque characteristic curve and the load curve. At this time, the necessary power is supplied from the generator 12.

When the setting signal of the work mode switch 31 is set to the cargo handling mode, or when the position operation signal of the forward / reverse operation lever 32 is in the neutral position, the cargo handling work torque performance curve is selected and the motor 1 Is performed.

By the above operation, as shown in FIG. 2, when a target motor rotation speed is to be obtained, when a rotation speed-torque characteristic curve of a flat road running torque performance curve is selected,
The torque at this time is limited as compared with the case where the rotation speed-torque characteristic curve of the cargo handling torque performance curve is selected. Therefore, the load on the engine 11 is reduced even in the rapid acceleration operation, and as a result, especially when the vehicle is forced to travel with a large amount of rapid acceleration, the fuel efficiency of the engine 11 can be particularly improved.

In the present embodiment, a flat-land running torque performance curve during flat-land running work is newly set. However, the performance curve conforms to each other work and satisfies the specification values required for each work. The inverter 3 is set with a rotation speed-torque characteristic curve in which the torque is limited in a range in which the operation is performed, and the input means (switch 31) is configured to be able to select one of these operations. Thus, a rotation speed-torque characteristic curve that matches this operation can be selected, and torque control can be performed according to the rotation speed-torque characteristic curve. At this time, since the rotation speed-torque characteristic curve that matches the operation is selected, the power is used most effectively, and the load on the engine 11 is reduced.

In this embodiment, the engine is a diesel engine. However, it goes without saying that a gasoline engine may be used.

[0033]

As described above, according to the present invention, the fuel consumption of the engine can be improved by selecting the rotation speed-torque characteristic curve that matches the work.

[Brief description of the drawings]

FIG. 1 is an electric control block diagram of an industrial vehicle according to an embodiment of the present invention.

FIG. 2 is a rotation speed-torque characteristic curve of a motor of the industrial vehicle.

FIG. 3 is a flowchart of traveling control of the industrial vehicle.

FIG. 4 is an electric control block diagram of a conventional industrial vehicle.

FIG. 5 is a rotation speed-torque characteristic curve of a motor of a conventional industrial vehicle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor 2 Wheel 3 Inverter 5 Rotation speed detector 6 Control device 7 Cargo handling device 11 Engine 11A Engine actuator 12 Brushless generator 13 Hydraulic pump 14 Voltage regulator (AVR) 15 Conductor 16 Operation panel 17 Monitoring device 18 Battery 20 Accelerator pedal 21 Accelerator pedal angle detector 31 Work mode switch 32 Forward / backward operation lever

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Hiroyuki Yokoyama 1-15-10 Kyomachibori, Nishi-ku, Osaka-shi, Osaka Inside TMC M Corporation (72) Inventor Kazuhiro Fujita Kyomachibori, Nishi-ku, Osaka-shi, Osaka 1-15-15 FTC term in TCM Corporation (reference) 3D037 EA00 EB02 5H115 PA12 PI22 PI29 PU09 PV10 QE05 QE08 QI03 RB14 SE02 SE03 SJ12 SJ14 TO21

Claims (3)

[Claims] An engine serving as a driving source for a plurality of operations;
A traveling drive device for an industrial vehicle capable of performing the plurality of operations, the traveling motor including a traveling electric motor supplied with power from a generator connected to the engine, wherein the electric motors correspond to operations for each operation. Traveling drive means having a rotational speed-torque characteristic curve, an accelerator pedal for inputting an operation amount of the electric motor or a lever corresponding to the accelerator pedal, and an input for selecting and inputting one of the plurality of operations. Means for selecting a rotation speed-torque characteristic curve of the work according to the work input by the input means, and controlling the torque of the electric motor according to the operation amount of the accelerator pedal or a lever corresponding to the accelerator pedal. A driving device for an industrial vehicle. 2. An engine serving as a driving source for a plurality of operations,
A traveling drive device for an industrial vehicle capable of performing the plurality of operations, comprising a traveling electric motor supplied with power from a generator connected to the engine, wherein the electric motor defines a low rotation speed range. Traveling drive means for performing torque control in accordance with a rotation speed-torque characteristic curve set for torque; an accelerator pedal for inputting an operation amount of the electric motor or a lever corresponding to the accelerator pedal; and an input for inputting a work mode of flat-land traveling. Means, a second rotation speed-torque characteristic curve in which the torque in the low rotation speed region is limited in inverse proportion to the rotation speed is set in the traveling drive means, and the work mode of level ground traveling is set by the input means. Is selected, the second rotation speed-torque characteristic curve is selected, and the accelerator pedal or a lever corresponding to the accelerator pedal is selected. A drive device for an industrial vehicle, wherein torque control of an electric motor is performed in accordance with an operation amount of the vehicle. 3. An engine serving as a driving source for a plurality of operations,
A traveling drive device for an industrial vehicle capable of performing the plurality of operations, comprising a traveling electric motor supplied with power from a generator connected to the engine, wherein the electric motor defines a low rotation speed range. Traveling drive means for controlling the torque in accordance with the rotation speed-torque characteristic curve set for the torque; an accelerator pedal for inputting the operation amount of the electric motor or a lever corresponding to the accelerator pedal; and selecting forward-neutral-reverse of the vehicle. A second rotation speed-torque characteristic curve in which a torque in the low rotation speed range is limited in inverse proportion to a rotation speed in the traveling drive means; When the accelerator pedal or the lever corresponding to the accelerator pedal is operated, the second rotation speed- A travel drive device for an industrial vehicle, wherein a torque characteristic curve is selected and torque control of an electric motor is performed in accordance with an operation amount of the accelerator pedal or a lever corresponding to the accelerator pedal.