JP2002082020A - Engine torque estimating device of engine bench system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that when an engine torque map is used in an engine bench system, an error of an engine torque estimated value affects a torque command value of a dynamo meter to disturb accurate engine benching. SOLUTION: A deviation between an engine speed calculated value calculated by a load model and a real engine rotation speed is derived, and the deviation is outputted as the engine torque estimated value to the load model through a PI calculating part or a transmission function part for stabilizing a closed loop. An output of the engine torque map is added to the output of the PI calculating part or transmission function part, and the result is outputted as a corrected engine torque estimated value to the load model.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an engine test apparatus using a dynamometer, and more particularly to an engine torque estimating unit in the test apparatus.

[0002]

2. Description of the Related Art As an apparatus for testing automobile parts, there is an engine bench system using a combination of an engine drive and a dynamometer absorption system. FIG. 7 is a schematic diagram of an engine bench system. In this engine bench system, a dynamometer DY and an engine E / G are directly connected by a shaft, and the load characteristics of the engine E / G are simulated by the dynamometer DY. To make it work.
This test apparatus does not directly measure the engine torque during the operation of the engine bench system, but uses an engine torque map TM representing the engine speed, throttle opening, and engine torque characteristics prepared and measured in advance. A rotation speed signal of the engine E / G detected by the tachometer during operation of the bench system and a throttle opening signal of the throttle actuator ACT are introduced into the engine torque map TM of the control device, and the engine signal is calculated from these input signals. The engine torque is estimated from the torque map and output to the load model LM. Load model L
M outputs a torque command value of the dynamometer from the input estimated engine torque value to the dynamometer DY via the inverter IV to simulate the load characteristics of the engine.

[0003]

In the test apparatus shown in FIG. 7, the estimated engine torque output from the engine torque map TM does not completely coincide with the actual engine torque during the operation of the engine bench system. Exists. This error in the estimated engine torque greatly affects the torque command value for the dynamometer output by the load model LM, and a more accurate simulation cannot be performed. Further, there is a problem that a large deviation occurs between the engine speed calculated in the load model and the actual engine speed, so that an accurate engine bench cannot be performed.

It is an object of the present invention to provide an accurate engine torque estimating device for an engine bench system.

[0005]

According to a first aspect of the present invention, an engine speed and a throttle opening signal directly connected to a dynamometer via a shaft are detected, and the engine signal is detected based on the detected signals. Estimate the torque, introduce the estimated value into the load model, calculate the engine speed value and the torque command value of the dynamometer, output the calculated torque command value to the inverter, and control the dynamometer via the inverter. In the control, a deviation between the calculated engine speed value in the load model and the detected engine speed signal or the speed signal of the dynamometer is obtained, and this deviation signal is output to a PI calculation unit for proportional. An integral operation is performed, and this operation value is output to the load model as an engine torque estimated value.

A second aspect of the present invention is to detect a rotational speed and a throttle opening signal of an engine directly connected to a dynamometer via a shaft, and to use an engine torque map based on the detected signals to determine an engine torque. , The estimated value is introduced into a load model, the engine speed value and the torque command value of the dynamometer are calculated, the calculated torque command value is output to an inverter, and the dynamometer is controlled through the inverter. In addition, the operation signal output from the PI operation unit is added to the engine torque estimated value estimated by the engine torque map, and the added signal is added to the load model as a corrected engine torque estimated value. The engine torque estimation device of the engine bench system is configured to output the output.

A third aspect of the present invention is to detect a rotational speed and a throttle opening signal of an engine directly connected to a dynamometer and a shaft, and to estimate an engine torque based on each of the detected signals. Introducing the estimated value into the load model, calculating the engine speed value and the torque command value of the dynamometer, outputting the calculated torque command value to the inverter, and controlling the dynamometer via the inverter, A deviation between the calculated engine speed value in the load model and the detected engine speed signal or the dynamometer speed signal is obtained, and the deviation signal is used as an estimated engine torque value via a transfer function unit for closed loop stabilization. An engine torque estimating device of an engine bench system is configured to output the load model.

A fourth aspect of the present invention is to detect a rotational speed and a throttle opening signal of an engine directly connected to a dynamometer and a shaft, and to use an engine torque map based on the detected signals to obtain an engine torque map. , The estimated value is introduced into a load model, the engine speed value and the torque command value of the dynamometer are calculated, the calculated torque command value is output to an inverter, and the dynamometer is controlled through the inverter. In this method, a deviation between an engine speed calculation value in the load model and the detected engine speed signal or a dynamometer speed signal is obtained, and this deviation signal is transmitted via a transfer function unit for closed-loop stabilization. The signal is applied to an addition unit, and the addition unit adds the estimated value to the engine torque estimated from the engine torque map to correct the added signal. The is obtained by constituting the engine torque estimating device for an engine bench system to output to the load model as an engine torque estimated value.

[0009]

FIG. 1 shows the configuration of a control section of a dynamometer according to an embodiment of the present invention. 1
Reference numeral denotes an engine control unit. The engine control unit 1 receives a vehicle speed command, a vehicle speed calculation value obtained by a load (vehicle) model 2 described later, and a detected engine speed signal. The throttle opening command, clutch stroke, transmission position, and brake stroke signals are calculated based on the input signals, and the throttle opening command is output to the throttle actuator unit 3 and the other three signals are used as load models. Output to 2. Reference numeral 4 denotes a throttle opening sensor which detects the throttle opening by the throttle actuator 3 and feeds back a detection signal to the throttle actuator 3 so as to eliminate the deviation from the opening command value in this actuator so that the opening is controlled. . The detected throttle opening signal is also output to the engine torque estimating unit 10, and this estimating unit 10
, The engine torque is estimated and output to the load model 2.

FIG. 3 shows the configuration of the load model.
The clutch stroke signal input from the engine control unit 1 indicates that the clutch 100%
(With the clutch closed state as 100%)
The deviation signal is output to the clutch model unit 22. An estimated engine torque value, a transmission rotation signal, and the like are input to the clutch model unit 22, the engine speed is calculated, and the calculated engine speed is fed back to the engine torque estimating unit 10 as the calculated engine speed value. Further, a value of the reaction force (model reaction force) between the clutch and the engine is output from the clutch model unit 22 to the comparison unit 21 and is compared with the estimated engine torque value in the comparison unit to obtain a shaft torque command value. Output to the torque controller 9. Reference numeral 23 denotes a transmission model unit, 24 denotes a gear model unit, and 25 denotes a brake model unit. A brake stroke signal and a vehicle speed calculation value are input to the brake model unit, and a brake signal is calculated and output to the vehicle model unit 27. . The vehicle model unit 27 receives a gear signal from the gear model unit 24 and a model signal of the running resistance from the resistance model unit 26 in addition to the brake signal. The vehicle speed value is calculated from these signals. This vehicle speed calculation value is fed back to the engine control unit 1.

The shaft torque controller unit 9 to which the shaft torque command value is applied also receives the shaft torque signal detected by the shaft torque meter 7 and calculates a current command value for the inverter. It is controlled based on. 5 is a dynamometer, shaft (axis),
The figure shows an engine part. The dynamometer is controlled by the output of the inverter 6, and the throttle opening of the engine is controlled by the opening signal from the throttle actuator 3. Further, the rotation speed of the engine or the rotation speed of the dynamometer is detected by the rotary encoder 8 and is output to the engine control unit 1 and the engine torque estimation unit 10 as the engine rotation speed.

FIG. 2 shows a first embodiment of the engine torque estimating section according to the present invention. In the figure, reference numeral 11 denotes an adder which adds the calculated speed of the engine calculated by the load model 2 and the actual speed of the engine detected by the rotary encoder 8 or the actual speed of the dynamometer with different polarities, to thereby obtain a deviation. Desired. The deviation value is proportional. The integration operation is performed and output to the addition unit 14. Reference numeral 13 denotes an engine torque map. This torque map 13 is similar to a conventional torque map, and calculates an estimated engine torque Te based on a detected speed signal of an engine or a dynamometer and a throttle opening degree detection signal. Estimated value T obtained
e is added by the adding unit 14 with the same polarity as the PI calculation value, and is output to the load model 2 as a corrected engine torque estimated value.

According to the first embodiment, the user of the engine bench system needs to determine two parameters, the proportional term KP and the integral term KI, but the appropriate range of the value of this parameter is 10 Since the bandwidth is twice or more, the parameter can be easily determined. Therefore, according to the present invention, even if the engine torque map has such an accuracy that an accurate engine bench cannot be performed, the engine speed is corrected by the difference between the calculated engine speed value and the actual rotation speed detection value. The engine bench can be accurately and reliably performed.

FIG. 4 is a block diagram of the engine torque estimating section showing the second embodiment. The parts different from the first embodiment shown in FIG.
4 is omitted, and the others are the same. Therefore, P
The output of the I operation unit 12 is directly output to the load model 2 as an estimated engine torque value.

According to the second embodiment, although the engine torque map is not used, the parameters of KP and KI are appropriately determined, and the output of the PI calculation unit 12 is used as the estimated engine torque value. An engine bench result equivalent to that of the first embodiment can be obtained. Therefore, since it is not necessary to create an engine torque map, the man-hour can be omitted, and the preparation time for executing the engine bench can be reduced.

FIG. 5 is a block diagram of an engine torque estimating unit according to a third embodiment. The same parts as those in FIGS. 2 and 4 are denoted by the same reference numerals, and description thereof is omitted. Reference numeral 15 denotes a transfer function unit for stabilizing the closed loop system. A deviation signal between the calculated engine speed value obtained by the addition unit 11 and the detected actual speed value is passed through the transfer function unit 15 to the addition unit 14.
Is applied to In the adding section 14, the engine torque map 1
3 is added to the estimated engine torque value Te and output to the load model 2 as a corrected estimated engine torque value.

According to the third embodiment, it is possible to calculate a fast-response estimated engine torque value while stabilizing a closed loop by eliminating the PI calculation unit.

FIG. 6 is a block diagram of an engine torque estimating section showing the fourth embodiment. The difference from the third embodiment shown in FIG. 5 is that the engine torque estimating section does not use the estimated value of the engine torque map. Transfer function unit 15 for stabilizing the closed loop system
Is output as it is to the load model as an estimated engine torque.

According to the fourth embodiment, a high-speed response of the estimated engine torque value can be realized, and the man-hour for executing the engine bench can be reduced by not using the output of the engine torque map. Things.

[0020]

As described above, according to the present invention, even when the accuracy of the engine torque map is low enough that an accurate engine bench cannot be performed, according to the first and third embodiments, the engine torque estimated value , A highly accurate estimated value of the engine torque can be obtained, and an accurate engine bench can be performed. Further, including the second and fourth embodiments, the response speed of the engine torque estimated value can be realized, and furthermore, it is possible to make the engine speed calculated in the load model substantially coincide with the actual engine speed. You can do it.

[Brief description of the drawings]

FIG. 1 is a schematic control circuit of an engine bench system showing an embodiment of the present invention.

FIG. 2 is a configuration diagram of an engine torque estimating unit according to the first embodiment of the present invention.

FIG. 3 is a configuration diagram of a load model used in the present invention.

FIG. 4 is a configuration diagram of an engine torque estimating unit according to a second embodiment of the present invention.

FIG. 5 is a configuration diagram of an engine torque estimating unit according to a third embodiment of the present invention.

FIG. 6 is a configuration diagram of an engine torque estimating unit according to a fourth embodiment of the present invention.

FIG. 7 is a configuration diagram of a conventional engine bench system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Engine control part 2 ... Load model 3 ... Throttle actuator 4 ... Throttle opening degree sensor 5 ... Dynamometer-shaft-engine part 6 ... Inverter 7 ... Shaft torque meter 8 ... Rotary encoder 9 ... Shaft torque controller 10 ... Engine torque estimation Units 11, 14 Addition unit 12 PI calculation unit 13 Engine torque map 15 Transfer function unit

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) F02D 45/00 364 F02D 45/00 364A 364G G01M 17/007 G01M 17/00 A F-term (Reference) 2G087 AA16 BB01 CC06 DD09 EE22 FF20 3G084 BA02 DA05 DA25 EA05 EA08 EA11 EB08 EB11 EB13 EC03 FA05 FA06 FA10 FA32 FA33 3G301 JA08 LA03 NA03 NA04 NA08 NB02 NB04 NC02 ND01 ND05 ND45 PA11A PA11Z PA17Z PE01Z PE06Z PF01ZPF

Claims (4)

[Claims] An engine torque directly connected to a dynamometer via a shaft and a throttle opening signal are detected, an engine torque is estimated based on the detected signals, and the estimated value is used as a load model. To calculate the engine speed value and the torque command value of the dynamometer, output the calculated torque command value to an inverter, and control the dynamometer via the inverter. A deviation between the calculated speed value and the detected engine speed signal or the speed signal of the dynamometer is obtained, and this deviation signal is output to a PI calculation unit to be proportional. An engine torque estimating device for an engine bench system, wherein an integral operation is performed and the calculated value is output to the load model as an engine torque estimated value. 2. An engine speed and a throttle opening signal directly connected to a dynamometer and a shaft through a shaft are detected, and an engine torque is estimated based on the detected signals using an engine torque map. Introducing the estimated value into the load model, calculating the engine speed value and the torque command value of the dynamometer, outputting the calculated torque command value to the inverter, and controlling the dynamometer via the inverter, A calculation signal output from the PI calculation unit and an engine torque estimated value estimated by the engine torque map are added, and the added signal is output to the load model as a corrected engine torque estimated value. An engine torque estimating device for an engine bench system. 3. An engine speed directly connected to a dynamometer via a shaft and a throttle opening signal are detected, an engine torque is estimated based on the detected signals, and the estimated value is used as a load model. To calculate the engine speed value and the torque command value of the dynamometer, output the calculated torque command value to an inverter, and control the dynamometer via the inverter. A deviation between the calculated speed value and the detected engine speed signal or the speed signal of the dynamometer is obtained, and this deviation signal is output to the load model as an estimated engine torque value via a transfer function unit for closed loop stabilization. An engine torque estimating device for an engine bench system, wherein 4. An engine speed directly connected to the dynamometer via a shaft and a throttle opening signal are detected, and an engine torque is estimated on an engine torque map based on the detected signals. Introducing the estimated value into the load model, calculating the engine speed value and the torque command value of the dynamometer, outputting the calculated torque command value to the inverter, and controlling the dynamometer via the inverter, A deviation between the calculated engine speed value in the load model and the detected engine speed signal or the speed signal of the dynamometer is obtained, and this deviation signal is applied to an addition unit via a transfer function unit for closed loop stabilization. The addition unit adds the estimated engine torque value from the engine torque map to the corrected engine torque. An engine torque estimating device for an engine bench system, wherein the engine torque estimating device is configured to output the estimated torque value to the load model.