JP2681768B2 - Engine dynamometer device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine dynamometer device.

[0002]

2. Description of the Related Art An engine dynamometer device for checking the performance of an engine of an automobile or the like receives an instruction generator such as a computer and a control instruction (target operation pattern) issued from the instruction generator to generate an engine dynamo. It is composed of an engine dynamometer controller and an engine controller that respectively control a meter and an engine.

[0003]

By the way, since the engine dynamometer has a rising delay from the vicinity of the command value of zero due to its inherent inertia and the like, as shown in FIG. On the other hand, the actual operation (actual operation) pattern has a time delay as shown by the curve B, so that the operation accuracy is poor in the conventional engine dynamometer device.

The present invention has been made in view of the above matters, and an object of the present invention is to provide an engine dynamometer device capable of operating an engine with high precision in accordance with a target operation pattern. It is in.

[0005]

In order to achieve the above object, the engine dynamometer device according to the present invention, in order to meet the rising delay from near the command value zero of the engine dynamometer, in the low torque region, Compare the control command from the command generator with the target operation pattern.
The output is changed to the operation pattern advanced for a fixed time .

[0006]

In the engine dynamometer device having the above structure, the rising delay amount from the vicinity of the command value zero of the engine dynamometer is corrected, so that the operation can be performed accurately with respect to the target operation pattern.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 schematically shows an engine dynamometer device according to the present invention. In the figure, reference numeral 1 is a command generator, which is, for example, a computer. The control command (operating pattern) issued from the computer 1 is, for example, a digital value representing the time-series engine shaft torque. Reference numerals 2 and 3 denote an engine dynamometer controller and an engine controller, which respectively control the engine dynamometer 4 and the engine 5. Reference numeral 6 is a connecting shaft that mechanically connects the output shaft of the engine dynamometer 4 and the output shaft of the engine 5. The configuration so far is no different from the conventional engine dynamometer device of this type.

The engine dynamometer device according to the present invention is greatly different from the conventional engine dynamometer device as shown in FIG. It is a point that correction is performed in consideration of the rising delay and the corrected operation pattern is output to the engine dynamometer controller 2. Then, the correction of the rising delay from near the command value zero of the engine dynamometer 4 is performed by a program process in the command generator 1, for example.

FIG. 3 is a diagram for explaining a method of correcting the rising delay from near the command value zero of the engine dynamometer 4. That is, FIG. 3 (A) target
Indicates the operation pattern , the first command value is the correction range (Q or less
Low torque range) . In this case, as shown in FIG. 6B, the first command value is changed (corrected) to an operation pattern advanced by time Δt compared to the target operation pattern shown by the imaginary line.

Then, in actual operation, the engine dynamometer 4 is delayed in rising with respect to the command value of the corrected operation pattern, and the operation according to the operation pattern as shown in FIG. 3 (A) is performed. That is, the rising delay of the engine dynamometer 4 is corrected.

In FIG. 5, as described above, by outputting the control command from the command generator 1 prior to the target operation pattern, the axis in actual operation when the rising delay of the engine dynamometer 4 is corrected. It shows the change in torque, and the curve C shows the actual driving pattern, which is significantly improved compared to the one shown by the curve B in FIG. 6, and is quite close to the target driving pattern shown by the curve A. I understand.

In the above-described embodiment, the operation pattern starts from the command value zero, but the present invention is not limited to this, and the operation pattern in which the rotating engine stops and then starts rotating again. Can also be implemented. That is, for the target operation pattern as shown in FIG. 4A, as shown by the solid line in FIG.
As compared with the target driving pattern indicated by the virtual line, the driving pattern is changed to the driving pattern advanced by the time Δt.

[0013]

As described above, according to the present invention,
The operation of the engine by the engine dynamometer, the target
The operation pattern can be accurately performed.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing a configuration of an engine dynamometer device according to the present invention.

FIG. 2 is a diagram for explaining the operation of the command generation device used in the present invention.

FIG. 3 is a diagram for explaining a method of correcting a rising delay from near the command value zero of the engine dynamometer.

FIG. 4 is a diagram for explaining another embodiment of the present invention.

FIG. 5 is a diagram showing an actual operation pattern in the engine dynamometer device according to the present invention.

FIG. 6 is a diagram for explaining a drawback of the conventional technique.

[Explanation of symbols]

 1 ... Command generator, 4 ... Engine dynamometer.

Claims (1)

(57) [Claims] 1. A low torque range so as to be commensurate with a rising delay amount from near the command value of the engine dynamometer of zero.
In the above, the control command from the command generator is changed to the operation pattern advanced by a predetermined time compared to the target operation pattern.
The engine dynamometer device is characterized by being output as