JPS63253232A - Load testing device for vehicle - Google Patents

Abstract

PURPOSE:To eliminate the need for a dedicated test course and a power absorbing car and to effectively conduct an actual car test with simple constitution by generating various load states artificially by a retarder provided to a vehicle so as to obtain a braking force. CONSTITUTION:Torque values corresponding to various kinds of loadage are written in a ROM 24 previously and its contents are read out by the memory retarder 23 and inputted to a microcomputer 21 while a load is selected with a load selection button 22. Further, various vehicle conditions and the tilt angle of a road surface from an inclination sensor 25 at the time of traveling are inputted to the microcomputer 21, which calculates a braking force to be absorbed according to the total weight of the vehicle. Then the retarder of an engine 1 is controlled through a controller 17 to absorb the torque of the engine 1 according to the current traveling state. Thus, the engine 1 can be loaded by the retarder which is controlled as mentioned above.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a load test device for a vehicle, and more particularly to a load test device for a vehicle that has a retarder and absorbs torque by the retarder to obtain braking force. SUMMARY OF THE INVENTION 1 The present invention provides a control means for controlling the torque absorbed by a retarder installed in a vehicle in order to obtain braking force, and is adapted to various road conditions such as load capacity and gradient. By absorbing the load with a retarder, it is possible to perform load tests by creating various simulated running conditions with a constant volume or an empty vehicle.

[Conventional technology]

When a vehicle such as a truck is supplied, a load test is carried out in advance, and the vehicle is loaded with cargo corresponding to various loading capacities, and the vehicle is driven in this state. Alternatively, as a load test, a towing method was adopted in which the vehicle that served as the load was towed. In this system, for example, a power-absorbing type equipped with a retarder was towed by a truck, and tests such as climbing tests were conducted on level ground. In such tests, a retarder installed in a power absorption type creates a load state by absorbing torque, and the torque absorbed by the retarder is converted into thermal energy, and this power absorption I was trying to cool it down using the cooling water stored in the car.

[Problems to be solved by the invention]

If a load test is actually carried out with cargo loaded, it will have to be carried out with various loading amounts, and the test will become extremely troublesome as it will be necessary to load and unload the cargo each time. Ta. In addition, when testing a vehicle with a load that exceeds the legal loading capacity, it must be conducted on a special test course, which has the disadvantage of not being able to conduct tests on regular roads. . In addition, the load test using a power absorption vehicle requires a dedicated power absorption vehicle, which makes the load test very large-scale and disadvantageous in terms of cost. The present invention has been made in view of these problems, and it effectively utilizes a retarder installed in a vehicle to obtain braking force, and uses this retarder to create various simulated load conditions. The object of the present invention is to provide an apparatus capable of carrying out tests. Means for Solving Problem K] The present invention provides a vehicle that is provided with a retarder and that absorbs torque by the retarder to obtain a braking force, which is provided with a control means for controlling the torque absorbed by the retarder. , various load states are created by the control means.

[Effect]

Therefore, according to the present invention, by creating various load states using the control means, it is possible to absorb braking force according to each load using the retarder, and thereby it is possible to conduct a pseudo load test. It becomes possible. K Embodiment FIG. 1 shows an engine 1 equipped with a retarder according to an embodiment of the present invention, and this engine 1 is constructed of, for example, a diesel engine for a truck. On the back side of this engine 1 is a flywheel housing 2.
is provided. A stator case 8 of an inductor type generator, which will be described later, is attached to the upper and lower portions of the housing 2. Furthermore, the transmission 5 is located on the back side of the flywheel housing 2.
is arranged to change the rotational speed of the engine 1 to an appropriate value and transmit it to the drive wheels via the propeller shaft 6. Next, to describe the structure of the retarder provided in this engine 1, as shown in FIG. Inductor magnetic poles 7 are provided at a predetermined pitch along the circumferential direction. The flywheel 4 provided with the magnetic poles 7 constitutes a rotor of an inductor type generator, and this generator constitutes a retarder of an automobile. Cases 8 are provided on the upper and lower sides of the housing 2, and a stator of an inductor type generator is housed in these cases 8. As shown in FIG. 3, this stator includes a plurality of pole cores 9 arranged in the circumferential direction of the flywheel 4. The lower end of the pole core 9 faces the inductor magnetic pole 7 through a small air gap, and the upper end is fixed to the cover plate of the case 8 via the stator yoke 10. An armature coil 11 and a field coil 12 are wound around the pole core 9, respectively. Note that while the armature coil 11 is wound across two pole cores 9, one field coil 12 is wound around each pole core 9. The field coil 12 on the stator side having such a configuration is the first
It is connected to a battery 14 via a controller 13 shown in FIGS. The controller 13 is equipped with a transistor 16 as shown in FIG. 1, and the field current is controlled by the transistor 16. The base of the transistor 16 is connected to a controller 17, and this controller 17 is further connected to a retarder switch 18 provided at the driver's seat. On the other hand, the armature coil 11 is connected to a load resistor 15 shown in FIG. The controller 17 is connected to a microcomputer 21, as shown in FIG. The microcomputer 21 is connected to a selection button 22 for selecting a load condition, a memory reader 23 for reading conditions written in the ROM 24, and an inclination sensor 25 for detecting the inclination condition of the road surface. It has become. By controlling the retarder through the controller 17, various load conditions are created. Next, the operation of the retarder for this automobile configured as described above will be explained. For example, when a car equipped with this retarder goes down a long slope, the retarder switch 18 provided at the driver's seat is turned on. Then, the transistor 16 of the controller 13 shown in FIGS. 1 and 2 is turned on by the control circuit 17. Therefore, a field current flows from the battery 14 through the transistor 16 to the field coil 12 of the stator of the inductor type generator, and the field coil 12 is excited. When the field coil 12 is excited in this way, as shown in FIG. A pair of ball cores 9 around which the 8II child coil 11 is wound are magnetized to have different polarities. Therefore, at a certain moment, a magnetic circuit 35 as shown by the dotted line in FIG. Then, a magnetic circuit 36 as shown by the chain line in FIG. 3 is formed. The magnetic fluxes passing through these magnetic circuits 35 and 36 both interlink with the armature coil 11, and the two magnetic circuits 3
The directions of the magnetic fluxes passing through 5.36 will be reversed. Therefore, due to this change in magnetic flux, the armature coil 11
An electromotive force is induced, and this inductor type generator generates electricity. This means that the engine 1 or the vehicle drives the flywheel 4, and the work done from the outside at this time is absorbed as braking force. Therefore, the vehicle is subjected to braking force by the electric power generated by the inductor type generator, and the vehicle is decelerated. The generated output at this time is the load resistance 15 shown in Figure 2.
It is now consumed by The retarder that generates braking force in this way is also used as a load test device for vehicles, and by absorbing loads equivalent to various loading capacities of the vehicle, it is possible to Various mi states are created in a simulated state with an empty vehicle in order to efficiently perform actual vehicle tests. Figure 4 shows the engine torque corresponding to various loading amounts, and by absorbing the torque corresponding to each loading amount with the retarder, it is possible to create a pseudo FI loading state with this retarder. Become. A map corresponding to such a graph is previously written in the ROM 24, and its contents are read out by the memory reader 23 and input to the microcomputer 21. At the same time, the load selection button 22 selects the live load. Furthermore, various vehicle conditions, such as the transmission 5, are sent to the microcomputer 21. Gear ratio, differential gear ratio, transmission efficiency, tire radius,
The front area of the vehicle, the air resistance coefficient of the vehicle, the rolling resistance coefficient, the vehicle weight, etc. are input. Note that such input may be performed using a keyboard, or may also be performed using a ROM.
24 may be written in advance, and may be arbitrarily selected when performing the test. Furthermore, the tilt angle of the road surface when driving is sent to the microcomputer 21 by a tilt sensor 2.
Input by 5. Then microcomputer 2
1 calculates the braking force to be absorbed according to the total weight of the vehicle, and the engine 1
It will absorb the torque of Therefore, the retarder controlled in this manner makes it possible to apply a load to the engine 1. Therefore, with such a vehicle, it is possible to create various simulated loading conditions in a constant load condition or an empty condition, and to conduct a load test for the vehicle in this condition. Moreover, according to such a test device, there is no need to change the load by loading or unloading a new load each time the load is changed, and the load state can be changed only by operating the load selection button 22. It becomes possible. Therefore, it becomes possible to improve the efficiency of actual vehicle testing. In addition, it is now possible to easily create a load condition equivalent to overload, so there is no particular problem when driving on general roads in this condition (and it is now possible to conduct actual vehicle tests with filtration on general roads. In addition, since there is no need to tow a power absorption vehicle equipped with a retarder, the test equipment does not need to be large-scale, and it is extremely advantageous in terms of cost.

[Application Example] Although the present invention has been described above with reference to the illustrated embodiment, the present invention is not limited to the above-described embodiment, and various modifications can be made based on the technical idea of the present invention. For example, in the above embodiment, a retarder is provided in the flywheel housing 2, and a load state is created in a pseudo manner by controlling the braking force of this retarder, but the position where the retarder is provided is limited to this position. Not done. That is, for example, as shown in FIG. 5, the load test may be performed using a retarder 30 connected to the power take-off 28 via a drive shaft 29. Alternatively, as shown in FIG.
It may be installed somewhere in the middle. Effects of the Invention As described above, the present invention provides a control means for controlling the torque absorbed by a retarder, and uses this control means to create various load conditions, thereby making it possible to conduct a load test on a vehicle. This is what I did. Therefore, according to such a configuration, it becomes possible to perform actual vehicle tests by creating various pseudo loading conditions in a fixed load state or an empty vehicle state, thereby making it possible to improve efficiency. In addition, it becomes possible to conduct a road test in an overloaded state, and since there is no need for a power absorption vehicle, it is possible to reduce the cost of the device.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a load test device according to an embodiment of the present invention, FIG. 2 is an external perspective view of a retarder for this load test, FIG. 3 is an enlarged front view of the same main part, and FIG. The figure is a graph showing a torque curve for forming a pseudo load state, FIG. 5 is a front view of a test device according to a modification, and FIG. 6 is a front view of a test device according to another modification. In addition, in the symbols used in the drawings, 7... Inductor 1a pole 11... Armature coil 12... Field coil 17... Controller 21... Microcomputer 22... Load selection button 23... ...Memory reader 24...ROM.

Claims (1)

[Claims] In a vehicle that is provided with a retarder and absorbs torque by the retarder to obtain braking force, a control means for controlling the torque absorbed by the retarder is provided, and various loads are controlled by the control means. A load test device for a vehicle, characterized in that it is configured to create a condition.