JP2745749B2 - Analysis method of engine output characteristics - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dynamometer for testing the transient performance and the like of an automatic transmission such as an automobile, and more particularly to a method for analyzing engine output characteristics.

B. Summary of the Invention The present invention analyzes the output characteristics of an engine that drives a specimen, and analyzes the behavior data of a real vehicle or an engine with a simulated load and the behavior data of a dynamometer under the same test conditions. By estimating the output torque data of the engine by comparing with the above, the engine output characteristic analysis that matches the behavior of the actual vehicle without directly measuring the torque output of the engine is performed.

C. Prior Art For the transient performance test of a transmission, conventionally, a test transmission and an engine corresponding to the test transmission were connected, and an acceleration / deceleration durability test and a shift feeling test were performed by controlling the output of the engine. As the engine driving method, an electric motor driving method has been proposed because of problems such as difficulty in reproducing operating conditions.

The transient dynamometer using the electric motor drive system realizes a large speed change at the time of gear shifting by a low inertia drive device having low inertia and output characteristics equal to or higher than that of the engine.

FIG. 4 shows an apparatus configuration diagram of the transient dynamometer. The low inertia drive unit (TR-DY) 1 is composed of a low inertia DC motor and a speed increaser. The DC motor is used as a thyristor Leonard type current control minor loop to perform torque control or speed control. Obtain low inertia output. The shaft output of the driving device 1 is used as a drive source of a test transmission 3 via a shaft torque meter 2,
Is made the driving force of the absorption dynamometer 5 and the flywheel 5A via the torque meter 4.

The low inertia drive unit 1, the test transmission 3, and the absorption dynamometer 5 are provided with dedicated control units 6, 7, and 8, respectively, and the TR-DY control unit 6 is provided with a torque or speed command to provide low inertia. The torque or speed of the driving device 1 is controlled. Among them, the torque control performs feedback control by butting of the detected torque T ₁ of the torque command and the torque meter 2 from the engine characteristic generator. Also, the speed command and the detection speed N _{1 of the} speed detector 10 are used for speed control.
Is performed by performing the feedback control.

The microcomputer-configured engine characteristic generator 9 has data obtained by setting or measuring the actual output torque T versus speed N characteristics of the engine for each throttle opening θ _i , and the input throttle opening and speed detection value N _1. , The torque to be output by the low inertia drive device 1 is obtained as a torque command output. The throttle opening θ _i may be set to the negative pressure of the intake air of the engine.
_I will explain using _i .

D. Problems to be Solved by the Invention In the conventional transient dynamometer, the engine characteristic generator 9 collects data by analyzing actual engine output characteristics. In this analysis of the engine output characteristics, a torque meter 13 and an absorption dynamometer for applying a simulated load to a test sample of the actual engine 11 and the automatic transmission 12 as shown in FIG. Although a test apparatus configuration in which the flywheel 14 and the flywheel 15 are combined is conceivable, the output characteristics (torque output T ₁ ) of the engine 11 cannot be directly measured by the torque converter function of the automatic transmission.

Therefore, a manual transmission is connected in place of the automatic transmission 12,
A method of measuring the output of the engine from the torque meter 13 when the manual transmission is shifted to the fourth speed (speed ratio 1 to 1) is employed. However, a manual transmission suitable for the engine 11 cannot always be prepared. In practice, it is often impossible to measure.

Although the output characteristics data of the engine alone of the engine manufacturer may be used, the output characteristics differ from the output characteristics when the transmission and the load are combined.

An object of the present invention is to provide a method capable of analyzing the output characteristics of an engine in accordance with the behavior of an actual vehicle without directly measuring the torque output of the engine.

E. Means for Solving the Problems The present invention, in order to achieve the above object, in obtaining the drive output data of a dynamometer that drives the motor by analyzing the output characteristics of the engine that drives the test object,
When a simulated load is applied to a real vehicle or a test piece driven by the engine and the engine is accelerated to a certain throttle opening (θ ₁ ), the engine speed (N ₁₀ ), the test output speed (N ₂₀ ), and the output torque (T ₂₀ ) waveform measurement is performed, the speed of the dynamometer adjusted to test conditions with the actual vehicle or the simulated load is controlled in accordance with the engine speed (N ₁₀ ) data (N ₁₁ ), and the speed control is performed. The waveforms of the sample output speed (N ₂₁ ), output torque (T ₂₁ ), and drive torque (T ₁₁ ) are measured, and the engine speed (N ₁₀ ), output speed (N ₂₀ ), and output torque (T ₂₀ ) are measured. ) Are respectively shifted by a fixed time to extract the driving torque (T ₁₁ ) during a period in which each deviation of the data (N ₁₁ ), the output rotation speed (N ₂₁ ) and the output torque (T ₂₁ ) is within a certain value, wherein the driving torque (T ₁₁₎ the throttle opening (theta ₁₎ And the engine output characteristic in the engine speed data (N _11).

F. Action The output speed of the engine using a real vehicle or a simulated load (N
₁₀ ) and the waveforms of the output rotation speed (N ₂₀ ) and output torque (T ₂₀ ) of the specimen, and the motor output rotation speed (N ₁₁ ) and the output rotation speed of the specimen (N ₂₁ ) even with dynamo under the same test conditions The engine output characteristic is analyzed by extracting a period in which the output torque (T ₂₁ ) and the output torque (T ₂₁ ) are similar, and estimating the motor output torque (T ₁₁ ) in the period as the engine output torque.

G. Embodiment FIG. 1 is an analysis procedure diagram showing an embodiment of the present invention.
First, as shown in FIG. 5, the engine 11 and the test transmission 12
And the absorption dynamometer 14 as a simulated load and the flywheel 15 are combined to set the throttle opening of the engine 11 to θ.
₀ (idle) behavior of the output shaft rotational speed N ₂ and the output shaft torque T ₂ of the engine speed N ₁ and the automatic transmission 13 when the accelerated test opening theta ₁ from waveform measurements. The waveform example at this time is the second
As shown in the figure, automatic transmission by the automatic transmission 12 (first to third gears)
Speed), and the output shaft torque T ₂ also has a unique behavior accompanied by a torque shock during shifting. In the figure, T ₁ denotes a torque predicted waveform of the engine output shaft.

The data N ₁ by the simulated load in step S1 described above,
The waveform diagrams N ₁₀ , N ₂₀ , and T ₂₀ of N ₂ and T ₂ may be measured in an actual vehicle.

Next, in the dynamometer configuration of FIG. 4, the absorption dynamometer 5 and the flywheel 5A are set to the same test conditions as the actual vehicle or the simulated load at the time of the measurement in step S1, and the test transmission 3 is automatically turned on. the same as the transmission 12, the TR-DY control unit 6 to control the speed low inertia driving unit 1 waveform data N ₁₀ as a speed command N ₁₁ in step S1. In the speed control in step S2,
The output torque T of the low inertia driving unit 1 with respect to a change in speed N ₁₁
Output torque T ₂₁ and the rotational speed N ₂₁ of ₁₁ test試変gearbox 3 to the respective measurement. Shows a waveform diagram of the time by superimposing the measured waveform diagram _{N 10, N 20, T 20} , T 10 in step S1 in FIG. 3.

The measured waveform diagram in step S3 described above is measured in a substantially similar shape in which the time axis is shifted to the right by the control response delay of the transient dynamotor as compared with the waveform diagram of the simulated load of FIG.

Next, the measurement waveform diagram N ₁₀ In step S4, N _20, T ₂₀ a predetermined time (typically 0.1-0.5 seconds) shifted waveform data
N ₁₀ ′, N ₂₀ ′ and T ₂₀ ′ are obtained, and these data are
Calculated respectively deviation between the measured data N _11, N _21, T ₂₁ at 5 at step S3, extracts the output torque T ₁₁ of the period is within an acceptable value the difference is set in advance. This extraction torque T ₁₁
The resulting output torque T ₁₁ in the rotational speed N ₁₁ and the throttle opening theta ₁ from the throttle opening theta ₁ at that time, this is the data of the engine characteristics generator 9 (step S
6). Incidentally, tolerance .DELTA.N _1, .DELTA.N _2, data of a period of the torque T ₁₁ which do not fall within the [Delta] T ₂ is determined by linear interpolation or the like between the torque data T ₁₁ which fall within the tolerance.

Processing in step S1~S6 to above, made of the analysis of the output torque T ₁₁ at the throttle opening theta _1, made in the other throttle opening theta ₀ through? _N a similar procedure, the engine characteristics throttle The opening degrees θ _{0 to} θ _n are determined for each speed.

According to the analysis procedure according to the present invention, the engine speed is adjusted by a dynamometer that matches the test conditions with respect to the data N ₁₀ , N ₂₀ , and T ₂₀ under the test conditions in which the engine and the automatic transmission are combined with the actual vehicle or the simulated load. give the same test conditions as the actual vehicle and the engine speed (low inertia driving unit speed) by controlling the speed by N _10, data N _11, N _21, T ₂₁ and each value deviation is within the allowable value in this state give the same operating conditions as the actual vehicle by limiting the range to obtain the same engine characteristics as vehicle behavior torque T ₁₁ of the period by estimating extracting an output torque of the engine.

As an actual analysis work, the measurement in step S1 is performed for all throttle openings θ _{0 to} θ _n at once and the data is stored at each throttle opening, and the measurement in steps S2 to S6 is performed.
The operation can be simplified by performing the measurement using the transient dynamometer and the data processing collectively for each throttle opening.

Further, in the embodiment, an analysis method of an engine output characteristic in a case of testing an automatic transmission is described. However, this method is used for analyzing an engine output characteristic in another dynamometer such as a case of obtaining data of an engine characteristic generator in a chassis dynamometer. Can also be applied.

H. Effects of the Invention As described above, according to the present invention, the waveforms of the behavior of the engine and the specimen using the actual vehicle or the simulated load are measured, and the motor is used when the speed changes are matched by the dynamometer under the same test conditions. In addition, to measure the waveform of the behavior of the test specimen and to use the motor output torque within the similar period of both measured waveforms as the estimated value of the engine output torque, the actual vehicle behavior without directly measuring the engine torque output The engine output characteristic analysis and the engine characteristic data that match the above can be obtained. Along with this, we will improve the dynamo test accuracy, compare the unit output characteristic data from the engine maker at the time of design and test of the test piece, know the differences from the actual vehicle characteristics, and improve the test sample and troubleshoot Available.

[Brief description of the drawings]

FIG. 1 is an analysis procedure diagram showing one embodiment of the present invention, FIG. 2 is an acceleration waveform diagram in an actual vehicle, FIG. 3 is a waveform diagram during ASR operation in a transient dynamometer, and FIG. 4 is a transient dynamometer device. FIG. 5 is a configuration diagram of a conventional test apparatus. 1 ... Low inertia drive device, 3 ... Test transmission, 5 ... Dynamo for absorption, 5A ... Flywheel, 6 ... TR-D
Y control unit, 7 ... Transmission control unit, 8 ... Dynamo control unit, 9 ...
Engine characteristic generator, 10 …… Speed detector, 11 ……
Engine, 12 Automatic transmission, 13 Torque meter, 14
…… absorption dynamometer, 15 …… flywheel.

Claims (1)

(57) [Claims] An output characteristic of an engine for driving a test piece is analyzed to obtain drive output data of a dynamometer for driving the test piece with a motor, and a simulated load is applied to a real vehicle or a test piece driven by the engine. When the engine is accelerated to a certain throttle opening (θ ₁ ), the engine speed (N ₁₀ ), the sample output speed (N ₂₀ ) and the output torque (T
Perform waveform measurement of _20), and the speed control according to the data (N ₁₁₎ of the actual vehicle or simulated load test conditions the engine speed the dynamometer combined (N _10), specimen output in this speed control rotational speed (N ₂₁₎ and the output torque (T ₂₁₎
And the drive torque (T ₁₁ ) are measured, and the engine speed (N ₁₀ ), output speed (N ₂₀ ), and output torque (T ₁₁ ) are measured.
₂₀ ) are respectively shifted by a certain time to extract the drive torque (T ₁₁ ) during a period in which each deviation of the data (N ₁₁ ), the output rotation speed (N ₂₁ ) and the output torque (T ₂₁ ) is within a certain value. And analyzing the driving torque (T ₁₁ ) as an engine output characteristic based on the throttle opening (θ ₁ ) and the engine speed data (N ₁₁ ).