JPH03170836A - Estimation of output characteristic for engine - Google Patents

Abstract

PURPOSE:To determine an input shaft torque accurately in a system using an engine by performing a learning operation using a motor based on revolutions of an input shaft or an output shaft obtained using the engine and an output shaft torque. CONSTITUTION:A sample 1 is driven using an engine and revolutions on the input side or on the output side thereof and an output shaft torque of the sample 1 are determined for each throttle opening or each parameter corresponding thereto with a data indicating hourly changes therein as reference data. The sample 1 is connected to a driver 3 equivalent to the engine in inertia in substance and an expected torque value of the device 3 at which a reference data is expected to be obtained is applied to the device 3 as torque specified value to operate and based on the data obtained from the operation and the reference data, the torque specified value is corrected to operate the device 3 again. This procedure is repeated until the data obtained approximates the reference data. The torque specified value at which approximation is gained or a detection value of an input shaft torque are estimated as input shaft torque value to be given when the reference data is obtained.

Description

[Detailed Description of the Invention] A. Industrial Field of Application The present invention uses a low-inertia drive device to test a tII-specimen such as an automatic transmission, because it is not possible to actually measure the engine output characteristics in a system that connects the engine and the specimen. This invention relates to a method for estimating the output characteristics.

B. Summary of the Invention The present invention provides a method for estimating the input shaft torque of a specimen in a system in which an engine and a specimen are connected, which comprises connecting a low inertia drive device to the specimen instead of the engine;
For example, by performing a learning operation based on the input shaft rotation speed and output shaft torque of the specimen, the unknown input shaft torque can be accurately grasped, and the characteristics of the specimen can be analyzed with high reliability. It is something.

C. BACKGROUND OF THE INVENTION When analyzing and evaluating the characteristics of automatic transmissions in automobiles or investigating the cause of trouble, it is necessary to understand the output characteristics of the engine. For this reason, in the past, for example, tests were carried out by attaching an automatic transmission, which is a specimen of an automobile manufacturer, but because of the structure, it is extremely difficult to insert a torque meter into the 111 between the engine and automatic transmission. It is not possible to measure the input shaft torque of an automatic transmission when the transmission is connected. Therefore, when evaluating automatic transmissions, we use output characteristic data submitted by engine manufacturers.

D. Problems to be Solved by the Invention However, it is not possible to determine whether the actual output of the engine matches the above output characteristic data.
There was a drawback that high confidence could not be placed in the obtained results.

An object of the present invention is to provide a method that can perform characteristic analysis and evaluation of a specimen such as an automatic transmission based on accurate engine output characteristics and can obtain highly reliable results.

E. Means and Effects for Solving the Problems The present invention drives a specimen by an engine in advance, and shows temporal changes in the rotational speed of one of the input or output sides of the specimen and the output shaft torque of the specimen. The data is set aside for each throttle opening or its corresponding parameter as reference data, and the specimen is connected to a drive device that has substantially the same inertia as the engine, and the drive device from which the reference data is expected to be obtained is connected. The driving device is operated by giving an expected torque value as a torque command value, and the torque command value is corrected based on the data obtained from the operation and the reference data, and the driving device is operated again. , the process is repeated until the data obtained during operation approximates the reference data, and the torque command value or the detected value of the input shaft torque when approximated is estimated as the input shaft torque value when the reference data is taken. shall be.

F. Embodiment FIG. 1 shows a test apparatus for carrying out the method of the present invention,
Torque meter 2 on the human power side of the automatic transmission a (automatic transmission) 1
A low inertia drive device 3 is connected to the output side via a torque meter 4, and an absorption dynamometer 5 is connected to the output side via a torque meter 4.

The low inertia drive device 3 is one that uses a DC motor and has a low inertia with special consideration given to shaft rigidity, etc., and has an inertia equivalent to that of an engine.

We will describe the procedure for obtaining the engine output characteristics in a system in which the engine and the transmission under test are connected using such a device.

First, data T is obtained from a system in which the test transmission is connected to the engine or by driving on the road, and shows the temporal change in the output shaft torque of the test transmission for each throttle opening.

(1) and data N1 showing the time change of the input shaft rotation speed. (
1) is prepared as reference data. Then a certain opening θ
T obtained at .

'rlo that is expected to output (t), N+o(t)
(t)*I is calculated from the gear ratio and the expected slip rate of the torque converter and given as a torque command to the low-inertia drive device 3, and the system shown in FIG. 1 is operated. Furthermore,'r. o(
t) *1 in *t indicates the first target value. The data obtained at this time is defined as the first data, and among this data, the data indicating the temporal change in the output shaft torque of the test transmission is T, (t), and the data indicating the temporal change in the input shaft rotation speed? Nz (L), and the values of 'rz+ (t) and Nz (Jin) at time th (k is an integer), respectively'
Let l'zt(tk) and Nz(tb). Second
The figure is a graph showing the reference data and the data of 1 same mouth.To explain the procedure that follows with reference to Fig. 2, NIL(tl' ) is obtained. followed by t
Find 'rz+(t+) at 1', Two(t+)
and 'r,, (t+') are compared. If the input shaft torque 'r+ of the test transmission when the command input T+o(t)*l when taking the first data is the reference data,
o(t), Two(t+) and T t(t
+'), but if they deviate, the values will be different. That is, if we look at time t1, 'r. (L1) and T■
The difference from (t+') is T,. (tl) *? is T
This is an indicator of the extent to which it deviates from +o(t+).

Therefore, ΔT*+(t+) is defined using the following equation (1), and ΔT
t, (t+)・T,. (t.)-Tt, (Ll')
...(1) This ΔT■(t1) and the first command value T,. (t,)*1, the second oil pressure ffl'r+o(t+)*2 is calculated by the following equation (2).

T+a(t+)*24to(L+)*1+a・ΔT. (
tl)/i...(2) where a is an adjustment coefficient for the value of ΔT*+(t+), and is set to a value of 0 to l, preferably 0.5 to 0.7. Ru. Further, i is a gear ratio, whereby the output shaft torque deviation ΔT*+(Lt) of the test transmission is converted into the input shaft torque deviation. Similarly, tt, ts...t. Also, the second command value T+o(t)*2 is determined.

And the second command value T1. (tk)*2 is given to the low customary drive device 3 as a torque command, and when the system shown in FIG. 1 is operated, the second data Txt(th), N+t
(tk) is obtained. Next, if we can carry t as a representative example, we get Nz+ ( t +
), find tJ that outputs N+t(t.+') at the same rotation speed as Two(t+) and 'I''y*(j+
') is calculated using equation (3).

ΔTt! (t+)4*o(t+)−Ttt(t+
' ) - (3) Using this ΔTtt and the second command value T+o(t+)*2, calculate the third command m'r lo(t,)*3 using the following equation (4).

T+o(L+)*3=T+o(t+)*2"a"ΔT2
t(t+)# ・(4) Repeat the operation in this way until n
Take the data for the nth time, and in the data for the nth time, E+,
j*'...t. ΔT, respectively. (tl), Δ'
rtn(t y) -...Δ' When all rtn(t.) become approximately zero, that is, 1Δ' at any time.
When rtn(tt.)l≦b (b is the set value),
Torque detection value 'r+n at each time of torque meter 2
(t +),'r+n(tt),-T,,(L1
), the reference data Two(t), N2.

(1) is the estimated value of the input shaft torque of the test transmission. In other words, in the above method, the input shaft torque is based on the input shaft rotation speed and output shaft torque of the test transmission. A learning operation is performed in which the shaft torque is estimated, the estimated value is used as a command value, and the input shaft torque is estimated again based on the operation result, thereby determining the unknown input shaft torque.

In this way, estimate the input shaft torque for each throttle opening, and use the opening O as a parameter to find the relationship between the input shaft torque '1゛1 and the output shaft rotation speed. 1 degree Celsius melted. Therefore, by driving the low-inertia drive device 3 based on this graph and operating the 4-system shown in Figure 1, a test equivalent to a full-length system using an engine can be performed while grasping the input shaft torque. It is possible to investigate the drive characteristics of the test transmission.

In the above, the test transmission used in the system shown in FIG. Use the same thing or the same type as when you took the quasi-data, and set the load inertia the same as when you took the reference data.

The l data can be taken while increasing the rotational speed or while the rotational speed is lowered, but when performing a learning operation, the rotational speed should be taken in the same direction as when the reference data was taken. In addition, as shown in Figure 4, errors are likely to occur in areas where the conversion efficiency changes, such as the converter area and the shift area where the torque converter functions in the test transmission. Exclude data.

Here, an example of the flow until the data shown in FIG. 3 is obtained by the learning operation is shown in FIG. 5. In this example, first, reference data N+o(t), Tt are obtained. (1) is set in the computer, and then the correction coefficient a/i (see equations (2) and (4)) for converting the output shaft torque to the input shaft torque is set.

and the expected input shaft torque T,. (t) *l is determined manually and the first simulation operation is performed. However, T
1. (1) *1 indicates each time t1 to t. This is time series data of predicted values in . Next, after sambling and recording the values of the input shaft rotation force and output torque at each time t, to t1, a data deletion area is designated, and a data deletion area other than this area is recorded. , (t) and find ΔT t. It is determined whether all of ([)I are smaller than the set value b. If it is smaller, the torque detection value of the torque meter 2 at each time in the simulation is used as the input shaft torque when the reference data is taken, and reference engine characteristic data is created as shown in FIG. Also 1ΔT,. ([) If one of j is greater than or equal to b, the second torque command value 't'to(
t) *2 is calculated, a second simulation operation is performed, and the same process is performed.

Note that in obtaining the reference data, data is collected for each throttle opening in the above example, but the data is not limited to the opening, and data may be collected for each value of a corresponding parameter such as intake pressure.

In addition, the method of specifying the data deletion area is to record the respective time changes of input shaft rotation speed, output shaft rotation failure, and output shaft torque on both sides N++ (t), N** (t), and Tt+ (t).
(■ is an integer) and specify it with the cursor,
Speed ratio N 11/Nl≦K (K is a constant of 0.9, for example)
It is possible to adopt a method of automatically removing the area where the signal is received, or a method of automatically removing the center of the area where the Uiro signal is present.

G. Effects of the Invention According to the present invention, a learning operation is performed by a system using an electric motor based on the input shaft rotation speed or output shaft rotation speed and output shaft torque of a specimen obtained in a system using an engine. Since the unknown input shaft torque is estimated by , it is possible to accurately know the input shaft torque in a system using an engine. For example, by operating the electric motor with the quasi-fixed value of the input shaft torque as torque m command, it is possible to perform a test equivalent to a system using an engine while understanding the input shaft. be able to perform characteristic analysis and evaluation with high reliability, and be able to accurately identify the cause of a problem.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing an apparatus for carrying out the method of the present invention, Fig. 2 is an explanatory diagram showing the state of learning and transfer, Fig. 3 is a graph showing an example of engine characteristics, and Fig. 4 is a rotation speed. FIG. 5 is a flowchart for carrying out the method of the present invention. !・Low inertia drive device, 2 4 ・Torque meter, 5... Absorption dynamometer. Figure 1 2.4--1) L meter 5 ---D reaction 9 Inamometer 9 Figure 2 Time Figure 3 Figure 4 Time Figure 5

Claims (1)

[Claims] (1) Driving the specimen with an engine in advance, the throttle opening or Setting aside each parameter corresponding to this, the test specimen is connected to a drive device that has substantially the same inertia as the engine, and the estimated torque value of the drive device that is expected to obtain the reference data is applied to the drive device. The torque command value is corrected based on the data obtained from the operation and the reference data, and the drive device is operated again.
The process is repeated until the data obtained through operation approximates the reference data, and the torque command value or the detected value of the input shaft torque when the data approximates the reference data is estimated as the input shaft torque value when the reference data is taken. A device for estimating engine output characteristics.