JP3025978B2 - Engine performance recording method and apparatus in engine test apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recording engine performance in an engine test apparatus, and more particularly to a method and apparatus for recording engine performance for creating an engine performance map.

[0002]

2. Description of the Related Art In an exhaust gas test operation of the United States Environmental Protection Agency (EPA), an operation program is defined as follows. That is, the speed (rotation speed) of each step
Is defined by the ratio with the maximum speed of the engine, and the torque of each step is defined by the ratio with the maximum torque corresponding to the speed (rotation speed) at that time. Therefore, when performing such an operation, it is necessary to determine a maximum torque curve corresponding to each speed in advance.

In the prior art, there is a method in which the throttle is fully opened, the speed of the engine is increased from a minimum speed to a maximum speed by a constant value, for example, 8 RPM / SEC, and the speed and torque are measured every second. is there. However, the constant value here means a speed that is sufficiently slow so that the influence of acceleration can be ignored.

That is, in the performance recording apparatus of the engine test apparatus, the engine under test is operated in a state where the throttle opening is set to a constant value based on the set throttle opening signal from the operation pattern generator, and the engine speed is controlled. The dynamometer torque is controlled so that the load torque is applied to the engine under test so that the detected value of coincides with the set number of revolutions from the operation pattern generator. Then, the engine speed is sampled for each set speed at appropriate intervals, and the corresponding load torque value is sampled to plot the engine speed-load torque relationship.

The above-mentioned sampling of the engine speed and the load torque value is performed in determining the maximum torque curve.
The throttle opening is performed at the full throttle opening, but may be performed by changing the set value variously to a different throttle opening. Then, the recorder stores the torque-engine speed diagram based on the input sample data. In the related art, a shaft torque meter is used for detecting the load torque.

[0006]

In the above-mentioned sampling of the dynamometer torque and the engine speed, the engine speed is sampled during acceleration or deceleration, and thus corresponds to the sampled engine speed. When a shaft torque meter is used for detecting load torque as in the related art, the detected load torque value is inaccurate due to the effect of torsional vibration.

Therefore, in order to avoid the influence of torsional vibration, the steady state of the engine speed at the time of sampling is maintained for a required time, and the average value of the detected load torque values during that time is used as the load torque value. For this purpose, a steady state of the engine speed must be maintained for each sampling, so that the test time becomes long and the test efficiency is poor.
SUMMARY OF THE INVENTION It is an object of the present invention to provide a performance recording method in an engine test device and a device therefor which solves the above-mentioned problems when sampling the load torque and simplifies the structure of the device.

[0008]

An engine performance recording method for creating an engine performance map in an engine test apparatus according to the present invention is to set a throttle of an engine under test to a throttle opening state corresponding to a test condition, and then to set the throttle of the engine under test in that state. In the operation, the engine rotation speed is actually measured and detected, and a load torque is applied to the engine under test by a dynamometer such that the measured engine rotation speed matches the engine rotation speed command value from the set operation pattern. The actual measurement and detection of the dynamometer torque at that time is performed, and the actual measured value of the engine speed and the actual measured value of the dynamometer torque are recorded, and are constituted by the following processes.

(1) Sampling engine rotation for setting a throttle opening command value to a predetermined value and detecting the actual measured value of the dynamometer torque for the engine rotation speed that changes in accordance with the set operation pattern in the set throttle opening state. Set the value at appropriate intervals.

(2) The above set operation pattern is to accelerate and decelerate between a low value and a high value after passing through each sampling engine rotation value.

(3) The actual measured values of the dynamometer torque corresponding to the respective values of the sampling engine rotation during the acceleration process and the actual measured values of the dynamometer torque corresponding to the aforementioned sampling engine speed during the deceleration process are detected and detected. An arithmetic mean value for each sampling engine speed is calculated, and is used as an actual measured dynamometer torque corresponding to each sampling engine speed.

(4) An engine speed-load torque line is obtained from the measured engine speed at each sampling engine speed and the measured dynamometer torque measured and detected corresponding to each sampling engine speed. Create a map and record the map.

An apparatus for performing the above method includes an operation pattern generator, a throttle control unit, a dynamometer control unit, a recorder, a dynamometer coupled to an output shaft of an engine under test, and a device under test. An engine speed detector provided on the output shaft of the engine and a torque detector provided on the dynamometer are provided.

The above components have the following configuration. (1) In the operation pattern generator, a predetermined throttle opening command value is set, an engine rotation value for sampling and setting the output of the torque detector is set at appropriate intervals, and the operation pattern generator passes all sampling engine rotation values. An engine speed command value based on a set operation pattern for sweeping the engine speed so as to accelerate and decelerate between a low value and a high value is input, and a throttle opening is supplied to a throttle control unit in accordance with the throttle opening command. A command value signal is input, and the engine speed is connected to the dynamometer control unit according to the operation pattern.

(2) The throttle control section is connected to the throttle so as to control the throttle opening to be a throttle opening command value.

(3) The dynamometer control section operates the engine under test, which is operated in the throttle opening state based on the throttle opening command based on the throttle opening command value, with the engine speed command value according to the operation pattern. Connected to control the dynamometer to apply such a load torque to the engine under test.

(4) The engine speed detector detects the engine under test that is operated in the throttle opening state based on the throttle opening command value and with the load torque based on the engine speed command value according to the operation pattern. Detect the rotation speed,
The actual rotational speed signal is input to the recorder and connected so as to be fed back to the dynamometer controller.

(5) The torque detector is connected so as to detect a torque value of the dynamometer during the above-mentioned operation and to input the dynamometer torque measured value signal to the recorder.

(6) The recorder performs the sampling during the speed-up process and the deceleration process of the sweep of the engine speed command value based on the input dynamometer torque actual value signal and engine speed actual value signal. The average value of the actual measured dynamometer torque at the time of detecting the actual measured rotational speed corresponding to the engine rotational value is calculated, and the engine performance data is recorded based on the actual measured rotational speed and the actual measured dynamometer torque.

[0020]

In creating a relational map between the engine speed and the load torque for each desired throttle opening of the engine E to be tested, first, a throttle opening command value signal is input to the throttle control unit from the operation pattern generator. Then, the throttle of the engine E under test enters the opening state corresponding to the command value.

In this state, the engine E under test is operated. During the operation, the engine speed is always measured and detected by the engine speed detector, and the dynamometer control unit includes the operation pattern generator. The engine speed command value signal is input from the controller, and the engine speed actual value signal from the engine speed detector is fed back, and the dynamometer control unit matches the engine speed actual value with the engine speed command value. The dynamometer current supplied to the dynamometer is controlled to apply such a load torque to the engine under test.

At this time, the measured engine speed signal from the engine speed detector and the measured dynamometer torque signal from the torque detector are simultaneously input to the recorder.
In the above operation, an acceleration / deceleration operation pattern is set in the operation pattern generator.

In the recorder, actual measured engine speed values sampled at appropriate intervals corresponding to the changing engine speed command value are input, and corresponding dynamometer torque actual measured values are sampled. The actual measured value of the engine speed and the measured value of the dynamometer torque, that is, the load torque are plotted, and the engine speed-load torque line is recorded.

The sampling of the actual measured value of the dynamometer torque is performed as follows. In one sampling engine speed, the engine speed command value input to the dynamometer control unit increases from a low value to a high value around the sampling engine speed according to the operation pattern set in the operation pattern generator. And is swept down from the high value to the low value again. That is, the engine speed is accelerated / decelerated with the sampling engine speed value in between.

In the recorder, the addition of the measured dynamometer torque corresponding to the sampling engine speed during the acceleration process and the measured dynamometer torque corresponding to the sampling engine speed during the deceleration process is performed. The average value is calculated, and is recorded as an actual measured value of the dynamometer torque corresponding to the sampling engine rotation value.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An apparatus for implementing a performance recording method for creating an engine performance map in an engine test apparatus according to an embodiment of the present invention will be described with reference to the drawings. The performance recording device for creating an engine performance map in the engine test device of the embodiment shown in FIG. 1 is of a type applied to an engine test device of an automatic driving device type on an engine bench, and includes an operation pattern generator 1 and a throttle The control unit 2, the throttle operation device 3, the dynamometer control unit 4, the dynamometer power amplifier 5, the recorder 6, and the engine E under test
A dynamometer 7 coupled to the output shaft S of the engine E, an engine speed detector 8 provided on the output shaft S of the engine E under test, and a torque detector 9 provided on the dynamometer 7. .

The operation pattern generator 1 is connected so that a throttle opening command value signal is input to the throttle control unit 2 and an engine speed command value signal is input to the dynamometer control unit 4. 2 is connected to input a throttle opening command based on the throttle opening command value to the throttle operating device 3, and the throttle operating device 3 changes the throttle of the engine E under test to the opening based on the throttle opening command. It is connected to the throttle so as to operate, and is connected so as to feed back a throttle opening actual measurement value signal of the operation opening to the throttle control unit 2.

The engine speed detector 8 operates the engine under test E in the throttle opening state according to the throttle opening command based on the throttle opening command value as described above.
The rotation speed of the motor 6 is detected, and the measured rotation speed signal is recorded by the recorder 6.
And is connected so as to feed back to the dynamometer controller 4.

The dynamometer control section 4 is connected to control the dynamometer current supplied from the dynamometer power amplifier 5 to the dynamometer 7, and the throttle opening state based on the throttle opening command based on the throttle opening command value. The dynamometer current is supplied to the engine E under test so as to apply a load torque to the engine E under test in which the measured actual rotational speed detected and input by the engine speed detector 8 from the engine E under test is equal to the engine speed command value. Control.

The torque detector 9 is connected so as to detect a torque value in the dynamometer 7 during the above-mentioned operation and to input a dynamometer torque measured value signal to the recorder 7.

A predetermined throttle opening command value is set in the operation pattern generator 1, and an operation pattern is set such that the engine speed command value is continuously accelerated / decelerated in a predetermined engine speed range. Is done.

The performance recording method for creating an engine performance map in the above-described engine test apparatus will be described as the operation and operation of the performance recording apparatus for creating an engine performance map.
In preparing a relationship map between the engine rotation speed and the load torque of the engine E under test, for example, when the throttle is fully open, first, when a throttle fully open command value signal is input from the operation pattern generator 1 to the throttle control unit 2, A throttle opening command corresponding to the command value is input to the throttle operation device 3.

The throttle operating device 3 is provided with an engine E under test.
The throttle opening is operated to bring the throttle opening fully open, and a throttle opening actual measurement value signal of the actual operation opening is fed back to the throttle control unit 2 so that the throttle accurately adjusts the throttle opening of the command value. Will be maintained.

In this state, the engine E under test is operated. In this operation, the engine speed is always measured and detected by the engine speed detector 8, and the dynamometer control unit 4 outputs the operation pattern. An operation pattern, that is, an engine speed command value signal for sweeping from a low speed to a high speed and from a high speed to a low speed in a predetermined engine speed range is input from the generator 1 and the engine speed from the engine speed detector 8 is input. The measured value signal is fed back, and the dynamometer control unit 4 sends the dynamometer power amplifier 5 to the dynamometer 7 from the dynamometer power amplifier 5 to apply a load torque to the engine E under test such that the measured engine speed matches the engine speed command value. Controls the dynamometer current supplied to the dynamometer. At this time, the measured engine speed signal from the engine speed detector 8 and the torque detector 9
The dynamometer torque measurement value signal from is input to the recorder 6 at the same time.

In the recorder 6, the actual measured engine speed detected and inputted in response to the changing engine speed command value is sampled at appropriate intervals during the acceleration and deceleration at sampling engine speed values. The measured actual dynamometer torque values are sampled and averaged with each other, and the corresponding measured actual engine speed values and the averaged measured dynamometer torque, that is, the load torque are plotted, and the engine rotational speed is plotted. The number-load torque line is recorded.

That is, in the recorder 6, the phase of the actual measured value of the dynamometer torque corresponding to each predetermined sampling engine speed during the acceleration process and the actual measured value of the dynamometer torque corresponding to each sampling engine speed during the deceleration process is calculated. The averaging value is calculated, and the averaging value is sampled as an actual measured value of the dynamometer torque corresponding to each sampling engine rotation value.

Therefore, the inertia components of the dynamometer and the engine included in the actual measured value of the dynamometer torque are offset by the increase and decrease of the rotational speed, and the torque value is equivalent to the steady-state measured value of the torque dynamometer torque. Is obtained.

[0038]

According to the present invention, since the load torque is detected in the dynamometer, accurate measured values can be obtained without being affected by torsional vibration, and there is no need to provide a shaft torque meter. It's easy.

The engine speed controlled by the dynamometer is swept, and a torque value at the predetermined speed when the speed increases and a torque value at the predetermined speed when the speed decreases are sampled. Since the average value of the two is recorded as a torque value corresponding to a predetermined rotation speed, the inertia components of the dynamometer and the engine included in the actually measured torque value are offset when the rotation speed increases and decreases, and the steady torque is obtained. Accurate torque measurement values equivalent to the values can be obtained in a short time.

Moreover, since the dynamometer torque value is only measured twice for each sweep, there is no need to wait for the actual measured value of the dynamometer torque torque to become steady, and the measurement time is shortened.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a performance recording device displacement meter adjusting device in an engine test device according to an embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 operation pattern generator 2 throttle control unit 3 throttle operation unit 4 dynamometer control unit 5 dynamometer power amplifier 6 recorder 7 dynamometer 8 engine speed detector 9 torque detector E engine under test S output shaft

Claims (2)

(57) [Claims] An engine under test is set to a throttle opening state corresponding to a predetermined throttle opening command value, the engine under test is operated in that state, and in that operation, the engine speed is measured and detected. A load torque is applied to the engine under test by a dynamometer such that the measured rotational speed matches the engine rotational speed command value based on the set operation pattern, the dynamometer torque at that time is measured and detected, and the engine rotational speed measured value is measured. And (2) setting a throttle opening command value to a predetermined value and changing the throttle opening command value in accordance with a set operation pattern in the set throttle opening state. A sensor that performs actual measurement detection of the actual measured value of the dynamometer torque for the engine speed. Setting the pulling engine speed value at appropriate intervals. (2) The above-mentioned set operation pattern is assumed to accelerate and decelerate between a low value and a high value after passing through each sampling engine rotation value. (3) actually measuring and detecting a dynamometer torque actual measurement value corresponding to each of the sampling engine rotation values during the acceleration process and a dynamometer torque actual measurement value corresponding to the sampling engine rotation value during the deceleration process;
An arithmetic mean value is calculated for each sampling engine rotation value, and is used as an actual dynamometer torque value corresponding to each sampling engine rotation value. (4) A map of an engine speed-load torque line is created based on the actual measured values of the engine speed at the respective sampled engine speeds and the actual measured dynamometer torque values corresponding to the respective sampled engine speeds. And record the map. An engine performance recording method in an engine test apparatus configured by the above process. 2. An operation pattern generator, a throttle control section, a dynamometer control section, a recorder, and a dynamometer coupled to an output shaft of an engine under test.
An engine speed detector provided on the output shaft of the engine under test and a torque detector provided on the dynamometer are provided. (2) The operation pattern generator is set with a predetermined throttle opening command value, The engine speed for sampling and setting the output of the torque detector is set at appropriate intervals, and the engine speed is swept so as to pass through all the sampled engine speeds and accelerate / decelerate between a low value and a high value. An engine speed command value based on a set operation pattern is input, a throttle opening command value signal is input to a throttle control unit according to the throttle opening command value, and an engine speed command value is input to a dynamometer control unit according to the same operation pattern. Are connected so as to input the value signal, respectively.
The dynamometer controller is connected to the throttle so as to control the throttle opening to be the throttle opening command value. (4) The dynamometer control unit controls the throttle opening state based on the throttle opening command based on the throttle opening command value. Connected to control the dynamometer so as to apply a load torque to the engine under test such that the engine under test is operated at the engine speed command value according to the operation pattern; The detector detects the number of revolutions of the engine under test operated in the throttle opening state based on the throttle opening command value and with the load torque based on the engine speed command value according to the operation pattern. It is connected so that the measured value signal is input to the recorder and fed back to the dynamometer controller. The dynamometer is connected to detect the torque value of the dynamometer during the operation described above and to input the measured dynamometer torque signal to the recorder. (7) The recorder detects the input dynamometer torque. A dynamometer at the time of detecting the actual rotational speed measurement value corresponding to the sampling engine rotational speed during the speed-up process and the deceleration process of the sweep of the engine rotational speed command value, based on the actual measurement value signal and the engine rotational speed actual measurement value signal. An engine performance recording apparatus for an engine test apparatus that calculates an average value of actual measured torque values and records engine performance data based on the corresponding measured actual rotational speed and measured dynamometer torque.