JPS5940232A - Chassis dynamometer - Google Patents

Abstract

PURPOSE:To prevent early abrasion of tires and to reduce loss of driving energy, by providing a controller, which controls the driving force and the number of rotation of a motor and the compressing force of a cylinder, which compresses a driving wheel to a drum. CONSTITUTION:A controller 17 of a chassis dynamometer measures the number of rotation of a motor 14, the stroke of a cylinder 10, the torque of the dynamometer. and the vehicle speed of a vehicle speed meter, and outputs the driving force and the number of rotation of the motor and the compressing force of the cylinder, which compresses a tire to a drum, as control signals. When the output of a comparator 106 exceeds the preset value of a judging condition setting device 105, the number of rotation and the driving force of the motor 14 and the compressing force of the cylinder 10 are controlled by a processing device 100. Thus, the early abrasion of the tires can be prevented and the loss of the driving energy can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a chassis dynamometer having all the devices related to warm-up and load setting using drive wheels.

Traditionally, chassis dynamometer warm-up and load settings are
This was done by pressing a rotating tire against the drum of a chassis dynamometer to transmit rotational force. This method has the disadvantage that the tires driving the drums slip during warm-up and load setting, which not only causes early tire wear but also increases drive energy loss.

The present invention is intended to improve the above-mentioned drawbacks of a chassis dynamometer having a device for warming up and setting a load by rotating a drum by a drive wheel, and the drum shaft of the chassis dynamometer is connected to a speedometer and a dynamometer. The drive wheel of the drum has one end of the shaft part facing the drum, supported by a cylinder rod that expands and contracts to press the drive wheel against the drum, and the other end is connected to the shaft of the motor via a universal joint, and a vehicle speedometer is connected to the drive wheel of the drum. Equipped with a controller that measures the output of the motor, the torque of the dynamometer, the stroke of the cylinder, and the rotational speed of the motor, and controls the driving force and rotational speed of the motor, and the pushing force of the cylinder that presses the drive wheel against the drum. The present invention provides a chassis dynamometer characterized by:

Hereinafter, one embodiment of the present invention will be explained with reference to the drawings.

As shown in Figure 1, the chassis dynamometer is
The shaft 2 of the vehicle is supported by a bearing 4.4' of a support base 3, the right side part is connected to a speedometer 5 and a dynamometer 6, and the left side part is connected to flywheels 7.7', 7'. Under the drum I of this chassis dynamometer, the right end of the drum drive tire 8 and its shaft 9 is connected to the rod 11 of the cylinder 1o.
The left end portion is attached to a support base 13 and is connected to a shaft 15 of a nine-moke 14 via a cross joint 16. The controller 17c of this chassis dynamometer measures the rotation speed of the motor 14, the stroke of the cylinder 1o, the torque of the dynamometer, and the vehicle speed using the vehicle speedometer,
The driving force and rotation speed of the motor, and the pressing force of the cylinder that presses the tire against the drum are output as control signals.

As shown in FIG. 2, the processing device 100 incorporated in the controller 17 has external input terminals 101, 102 and external output terminals 103, and determines that the tire effective diameter setting is '6xo4' by inputting the tire effective diameter and judgment conditions in advance. A condition setting device 105 is provided. The external input terminal 101 is connected to the input end of a comparator 106 that compares the drum peripheral speed and the tire peripheral speed, and the external input terminal 102 and the output side of the tire effective diameter setting device are connected to the output side of the tire effective diameter setting device. It is connected to the input terminal of the arithmetic unit 107 that calculates the circumferential speed. The output side of the comparator 106 and the output side of the judgment condition setter are connected to the input side of a comparator 108 that compares whether the difference between the drum circumferential speed and the tire circumferential speed falls within the set judgment condition. . The output side of comparator 108 is connected to external output terminal 103.

When the output of the comparator 106 exceeds the set value of the judgment condition setter II, this processing device 100 outputs a signal from the external output terminal 103, and based on this output signal, the controller 17 controls the rotation speed of the motor 14. and driving force,
The pressing force of the cylinder 10 is controlled.

The chassis dynamometer of the present invention is configured as described above,
As a result, premature wear of the tire caused by the tire slipping against the drum is prevented, and at the same time, the loss of drive energy is reduced.

[Brief explanation of the drawing]

Figure 1 is a front view of the chassis dynamometer of the present invention, Figure 2 is a front view of the chassis dynamometer of the present invention;
The figure is a block diagram of a processing device within the controller. ■11. Drum, 2 Drum shaft, 5...Vehicle speedometer, 6
1. , dynamometer, 8... tire, 9... tire shaft, 10 river cylinder, 11... rod, 14...
- Motor, 15... Motor shaft, 16... Cross joint, 17... Controller, 100... Processing device, 1
04... Tire effective diameter setter, 105... Judgment condition setter, 106.108... Comparator, 107... Arithmetic unit. Patent Applicant: Toyota Motor Corporation Agent, Patent Attorney: Yumi Sae (1 other person) Figure 1

Claims (1)

[Claims] (1) In a chassis dynamometer in which a drum is rotated by a drive wheel, the shaft of the drum is connected to a speedometer and a dynamometer, and one end of the drive wheel of the drum is extended and contracted toward the drum so that the drive wheel is connected to the drum. The other end of the shaft is connected to the motor shaft via a universal joint, and the output of the speedometer, torque of the dynamometer, cylinder stroke, and motor rotation speed are measured. A chassis dynamometer characterized by comprising a controller that controls the driving force and rotation speed of the motor and the pressing force of the cylinder that presses the driving wheel against the drum.