JPH04361129A - Control device in engine test device - Google Patents

Abstract

PURPOSE:To prevent troubles such as engine stop due to overload of an engine by controlling the number of revolutions of an engine to be tested automatically and preferentially. CONSTITUTION:A target number of revolutions of an engine which is input from an operation pattern generator 1 and a throttle opening theta corresponding to a dynamic meter torque target value T are calculated by a throttle control portion 5. A throttle opening command is input to a throttle operation portion 6, thus enabling the throttle of an engine E to be in opened state. An actually measured value of a throttle opening of the actual operation opening theta fb is fed back to the control portion 5, thus enabling the throttle to be maintained to the opening theta accurately. Also, the target value T is input to a control portion 3 through a torque target value operation portion 2 from the generator 1. The control portion 3 performs control so that a dynamometer current corresponding to the target value is supplied from the dynamometer power amplifier 4 to a dynamometer 7. Even if an operation state where the number of revolutions and torque increases is requested, the number of revolutions is controlled preferentially. thus preventing troubles due to over load.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an engine testing device.

0002

2. Description of the Related Art In a conventional control device for an engine testing apparatus, engine rotational speed is controlled by the throttle opening of the engine under test, and output shaft torque is controlled by a detected value of a dynamometer.

0003

In recent transient operation tests, etc., an operating condition is required in which both the rotational speed and torque of the engine under test rapidly increase. In such a sudden increase in the rotational speed and torque of the engine under test, the maximum load torque exceeds the rated torque of the engine under test, reaching 1.1 times, for example, and under that operating condition. , the load exceeds the output of the engine under test, causing problems such as engine stoppage. The present invention provides a control device for an engine testing device that prevents troubles such as engine stoppage due to overload during testing of an engine under test.

0004

[Means for Solving the Problems] A control device in an engine testing apparatus of the present invention includes an operation pattern generator, a torque target value calculation section, a dynamometer control section, a throttle control section, a throttle operation section, and a target torque value calculation section. It includes a dynamometer coupled to the output shaft of the test engine, a rotational speed detector provided to the output shaft of the engine under test, and a torque detector provided to the dynamometer.

The driving pattern generator is connected to input both the dynamometer torque target value signal and the engine rotational speed target value signal to the torque target value calculation unit and the throttle control unit, respectively, and the throttle control unit is connected to the dynamometer torque target value signal and the engine rotation speed target value signal, respectively. It is connected to control the throttle opening based on the torque target value and the engine rotational speed target value, and the actual measurement value signal of the throttle operation opening of the engine under test is inputted to the torque target value calculation section. The rotational speed detector is connected to detect the rotational speed of the engine under test and feed back the measured rotational speed signal to the torque target value calculation section and the throttle control section,
The torque detector is connected to detect the torque value in the dynamometer during the above-mentioned operation and feed back the dynamometer torque actual measurement value signal to the dynamometer control section.

[0006] The torque target value calculation section calculates whether the actual throttle opening value is a fully open value or an approximate value based on the dynamometer torque target value, the engine rotational speed target value, the engine rotational speed actual value, and the throttle opening actual value. The system also determines whether the measured value of the engine speed has reached a value equal to or close to the target value, and if it has not reached the target value, calculates a corrected dynamometer torque target value that is reduced by a predetermined amount from the target value, and corrects it. The dynamometer torque target value signal is connected to be input to the dynamometer controller, and the dynamometer controller adjusts the actual dynamometer torque value to the modified dynamometer torque target value based on the modified dynamometer torque target value. The dynamometer is connected to control the dynamometer current supplied to the dynamometer.

[0007]

[Operation] During the test operation of the engine under test in the engine test equipment equipped with the above control device, the engine rotation speed target value Nset input from the operation pattern generator
The throttle opening degree θ corresponding to the dynamometer torque target value Tset is calculated by the throttle control unit, and the throttle control unit controls the throttle opening degree based on the throttle opening command. The throttle of the engine under test is set to the opening degree specified by the throttle opening command.

[0008] Furthermore, the dynamometer torque target value Tset is generated from the driving pattern generator via the torque target value calculation section.
is input to the dynamometer control unit, and the dynamometer control unit controls the current supplied to the dynamometer to a value corresponding to the dynamometer torque target value Tset, and as a result, the dynamometer controls the engine under test during test operation. A torque of target value Tset is applied to E.

During the above-mentioned test operation of the engine under test, the engine rotation speed Nfb is detected by the engine rotation speed detector in the engine testing device, and the dynamometer torque Tfb is detected.
are actually measured and detected by a torque detector.

[0010] In the torque target value calculation section,
The dynamometer torque target value Tset signal and the engine rotational speed target value Nset signal are input from the driving pattern generator, and the throttle opening actual value θfb signal is input by the throttle operator to the engine rotational speed actual value Nfb.
Signals are respectively input by engine speed detectors.

Therefore, during the above-mentioned operation, the torque target value calculation section calculates the full opening of the throttle opening actual value θfb during operation with the dynamometer torque target value Tset and the engine speed target value Nset as described above. It is determined whether the measured throttle opening value θfb has reached full opening or an approximate value, and the relationship between the measured engine speed value Nfb and the engine speed target value set in the driving pattern generator 1 is determined. Even if the actual measured throttle opening value θfb reaches full open or an approximate value, the actual measured engine rotational speed value Nfb is still compared to the target value Nset.
It is determined whether the approximate value has not been reached.

[0012] If the actual engine speed value Nfb does not reach the target value Nset or an approximate value even though the throttle opening is at full open or near full open, the operating pattern generator sets the Since the dynamometer torque target value Tset inputted from Value Tse
The t' signal is input from the torque target value calculation section to the dynamometer control section. Then, the dynamometer current is corrected and controlled by the dynamometer control unit, and as a result, the dynamometer torque (load torque) maintains the engine speed accurately at the target value when the throttle opening actual value θfb is fully open or at an approximate value. Modified to obtain.

As described above, when testing an engine under test on an engine testing device, automatic Priority is given to the rotational speed of the engine under test, preventing problems such as engine stoppage due to overload.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. The control device in the engine testing device of the embodiment shown in FIG. , dynamometer control section 3, dynamometer power amplifier 4, throttle control section 5, throttle operating device 6, and engine under test E
It is composed of a dynamometer 7 coupled to the output shaft S of the engine under test, an engine rotation speed detector 8 provided on the output shaft S of the engine under test E, and a torque detector 9 provided on the dynamometer 7. .

The driving pattern generator 1 is connected to input both the dynamometer torque target value signal and the engine rotational speed target value signal to the torque target value calculation section 2 and the throttle control section 5, respectively. 5 is connected to input a throttle opening command based on the engine speed target value and the dynamometer torque target value to the throttle operating device 6, and the throttle operating device 6 controls the throttle of the engine E under test to adjust the throttle opening. It is connected to the throttle of the engine E under test so as to operate the opening based on the command, and inputs the throttle opening actual measurement value signal of the operating opening to the torque target value calculation section 2 and to the throttle control section 5. Connected to give feedback.

The engine rotational speed detector 8 detects the rotational speed of the engine under test E operated in a throttle state at an opening based on a throttle opening command, and sends the measured rotational speed signal to a torque target value calculation section. The torque detector 9 detects the torque value at the dynamometer 7 during the above operation and feeds back the dynamometer torque actual measurement value signal to the dynamometer control unit 3. connected to.

The torque target value calculating section 2 calculates a corrected dynamometer torque target value based on the dynamometer torque target value, the engine rotation speed target value, the engine rotation speed actual value, and the throttle opening actual value, and The dynamometer control unit 3 is connected to input the torque target value signal to the dynamometer control unit 3, and the dynamometer control unit 3 measures the dynamometer torque based on the corrected dynamometer torque target value and the fed-back dynamometer torque actual measurement value. The dynamometer power amplifier 4 is connected to supply the dynamometer 7 with a predetermined dynamometer current whose value becomes the corrected dynamometer torque target value.

The operation and function of the control device of the engine testing apparatus of the above embodiment will be explained. The engine E to be tested mounted on the engine bench is tested. During this operation, the throttle opening θ corresponding to the engine speed target value Nset and dynamometer torque target value Tset inputted from the driving pattern generator 1 is calculated by the throttle control section 5, and the throttle opening command is used to control the throttle control. The signal is input from the section 5 to the throttle operating device 10. The throttle operating device 10 operates the throttle of the engine under test E to bring it into the opening state of the throttle opening command, and also feeds back a throttle opening actual value signal of the actual operating opening θfb to the throttle control unit 5. However, the throttle is accurately maintained at the opening θ of the throttle opening command.

Further, the dynamometer torque target value Tse is generated from the driving pattern generator 1 via the torque target value calculating section 2.
t is input to the dynamometer control section 3, and the dynamometer control section 3 outputs the dynamometer torque target value Ts.
The dynamometer power amplifier 4 is controlled to supply a dynamometer current corresponding to et to the dynamometer 7, and the dynamometer 7 loads the engine E under test with a target value of torque.

During the above test operation of the engine under test, the engine speed Nfb is constantly maintained in the engine test equipment.
The engine speed detector 8 actually measures the dynamometer torque Tfb, and the torque detector 9 actually measures the dynamometer torque Tfb. The engine speed actual measurement value Nfb signal from the engine speed detector 8 is fed back to the throttle control unit 5, and the throttle opening is controlled so that the engine speed is accurately maintained at the target value Nset. A command is given and input to the throttle operating device 10. In this way, the engine E under test is operated under the target value of dynamometer torque (load torque) Tset with the engine speed being accurately maintained at the target value Nset by operating the throttle.

In the torque target value calculating section 2, the dynamometer torque target value Tset signal and the engine rotational speed target value Nset signal are inputted from the driving pattern generator 1, and the throttle opening actual value θfb signal is inputted from the throttle operating device. 6, the actual engine rotation speed value Nfb
A signal is respectively inputted by the engine speed detector 8, together with a dynamometer torque target value Ts as described above.
et and the actual throttle opening value θfb and the actual measured engine speed value N during operation with the engine speed target value Nset.
The rotational speed deviation ΔN=(Nset−Nfb) from the engine rotational speed target value Nset of fb is constantly monitored.

Therefore, during the above operation, load torque correction control is performed every control cycle. In the torque target value calculation unit 2, the actual throttle opening value θfb and the throttle opening discrimination value θ0 (for example, 90% of full open) are compared, and the actual throttle opening value θfb is determined as the throttle opening discrimination value θ0 ( For example, 90% of full throttle) is exceeded (θ
fb>θ0), and even when the actual throttle opening value θfb exceeds the determination value θ0, the actual engine speed value Nfb still does not reach the target value Nset, and the engine speed deviation ΔN is the rotation speed deviation judgment value N0
(for example, 100 rpm) or more, that is, θ
It is determined at each control cycle whether the conditions of >θ0 and ΔN>N0 are satisfied.

[0023] If the above conditions are met,
That is, if the rotational speed deviation ΔN is larger than the discrimination value even though the throttle opening is at full open or near full open, the danammometer torque target value Tset that is set in the driving pattern generator 1 and input from there is too large, so in the torque target value calculation section 2,
It is decreased based on the following formula and inputted to the dynamometer control section 3 as the corrected dynamometer torque target value Tset'. Tset'=Tset-k(Nset-Nfb)
However, k: rotation speed deviation ΔN/torque conversion constant

00
24] Corrected dynamometer torque target value Tset
'A signal is inputted from the torque target value calculation section 2 to the dynamometer control section 3, the dynamometer current is corrected, and the load on the engine E under test is reduced. As a result, the actual engine speed value Nfb increases and the target value Nset
reach.

[0025]The above load torque correction control is as follows:
This is performed every control cycle, and when the throttle opening is at the throttle opening discrimination value θ0 (for example, 90% of full open) and the measured engine speed value Nfb reaches the target value Nset, it is canceled and the normal control returns. Since the changeover from the modified control to the normal control uses a reduced torque value proportional to (Nset - Nfb), the control changeover is performed bumplessly. In this way, the dynamometer torque (load torque) is corrected so that the throttle opening is at the throttle opening determination value θ0 (for example, 90% of full open) and the engine speed can be accurately maintained at the target value.

Note that the dynamometer torque actual value Tfb from the torque detector 9 is fed back to the dynamometer control section 3, and the dynamometer torque is accurately maintained at the corrected dynamometer torque target value Tset'.

As described above, in the test of the engine under test on the engine test equipment, in the case of a transient operation test etc. in which the engine under test is required to be in an operating state in which both the rotational speed and the torque rapidly increase, the automatic Priority is given to the rotational speed of the engine under test, preventing problems such as engine stoppage due to overload.

[0028]

[Effects of the Invention] According to the control device in the engine testing apparatus of the present invention, even if the engine under test is required to operate in an operating state in which both the rotational speed and torque rapidly increase, as in recent transient operation tests, The test is controlled so that the rotation speed of the engine under test is prioritized, and troubles such as engine stoppage due to overload are prevented.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a control device of an engine testing device in an embodiment of the present invention.

[Explanation of symbols]

1 Operation pattern generator 2　Torque target value calculation section 3 Dynamometer control section 4 Dynamometer power amplifier 5 Throttle control section 6 Throttle operator 7 Dynamometer 8 Engine speed detector 9 Torque detector E Engine under test S　Output shaft

Claims (1)

[Claims] Claim 1: A driving pattern generator, a torque target value calculation section, a dynamometer control section, a throttle control section, a throttle operation section, a dynamometer coupled to an output shaft of an engine under test, and a The driving pattern generator includes a rotational speed detector provided on the output shaft of the engine and a torque detector provided on the dynamometer.
The dynamometer torque target value signal and the engine speed target value signal are both connected to be input to the torque target value calculating section and the throttle control section, respectively, and the throttle control section inputs the dynamometer torque target value signal and the engine speed target value signal. It is connected so that the throttle opening is controlled to the opening based on the rotational speed, and the actual measured opening of the throttle of the engine under test is input to the torque target value calculation section. The detector detects the rotation speed of the engine under test and is connected to feed back the measured rotation speed signal to the torque target value calculation section and the throttle control section, and the torque detector is connected to the dynamometer during the above operation. is connected to detect the torque value at and feed back the dynamometer torque actual measurement value signal to the dynamometer control section, and the torque target value calculation section is configured to detect the dynamometer torque target value, the engine rotation speed target value, and the engine rotation Based on the actual measured value of the engine speed and the actual measured value of the throttle opening, it is determined whether the actual measured value of the engine speed has reached the target value or the approximate value even if the actual measured value of the throttle opening is the fully open value or an approximate value. is connected to calculate a corrected dynamometer torque target value that is decreased by a predetermined amount from the target value when the target value has not been reached, and to input the corrected dynamometer torque target value signal to the dynamometer control unit. A control device in an engine testing apparatus connected to control a dynamometer current supplied to a dynamometer such that a measured dynamometer torque value becomes a corrected dynamometer torque target value based on a corrected dynamometer torque target value.