JPS63218831A - Transient shaft torque measuring apparatus - Google Patents

Abstract

PURPOSE:To continuously measure the output torque of an engine even when the number of rotations of a load shaft changes, by calculating engine torque on the basis of the angular velocity of a crank shaft, the angular velocity of the load shaft and the data of a data setting device. CONSTITUTION:An angle sensor 30 for detecting the angle of rotation of a crank shaft 29 is provided to an engine 22 tested. A load shaft 25 is connected to said shaft 29 through a connection shaft 28 and an angle sensor 31 detecting the rotationed speed of the load shaft 25 is provided. The output signals from these sensors 30, 31 are inputted to a control unit 32 and respectively latched to latch circuits 37, 38 as count values. In the unit 32, MPU 39 stores these latched count values in a memory 47. MPU 39 operates the engine torque of the engine on the basis of the values stored in the memory 47 and the moment of inertia and friction torque from a data setting device 40. This calculated torque is the output torque generated by the engine 22 and can be continuously measured even when the number of rotations of the load shaft 25 changes.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a device for measuring the transient shaft torque of an automobile engine. It is necessary to analyze and evaluate the driving performance of a motor, and for this purpose, various shaft torque measuring devices have been provided in the past (see Japanese Utility Model Application Publication No. 179138/1983). , where l is test engine 2
and a transmission device 3 assembly, and 4 is a DC electric dynamometer whose one end of a rotor shaft 5 is connected to the output shaft 7 of the assembly 1 through a connecting shaft 6, and which is rotationally driven by the test engine 2. ,
The other end of the rotor shaft 5 is connected to a shaft 8 of an inertia imparting mechanism that carries an inertia disk 9 having a weight equivalent to that of a heavy vehicle platform. The torque of the test engine 2 is absorbed as it rotates, and an electrical signal corresponding to the absorbed torque is output to the arithmetic unit 10. Furthermore,
The electric dynamometer 4 is equipped with an angular velocity sensor 11 that detects the angular velocity of the rotor shaft 5 and outputs a signal corresponding to the angular velocity to the arithmetic unit 10.

The above calculation 1fFilo is the angular velocity sensor 1.
The output from 1 is differentiated by a differentiator, and this angular velocity value is integrated with the moment of inertia and other set values from the data setter 12 set externally.

Reference numeral 13 in the figure is a pen-type recording device that measures the shaft torque of the engine by adding this integrated value and the absorption torque signal.

Problems to be Solved by the Invention However, in the above-mentioned conventional excessive shaft torque measuring device, torque measurement in a transient operating state in which a gear change operation is performed by the transmission B3 is performed by measuring the angular velocity of the rotor shaft 5 according to the reduction ratio. Measurement is based on signals.

Therefore, even when measuring torque in a transient operating state to analyze continuous engine output torque, since the angular velocity of the rotor shaft 5 is used as a reference, discontinuous points occur and accurate output torque measurement values cannot be obtained. What (・.

Means for Solving the Problems This invention has been devised in view of the above-mentioned problems of conventional B. Basically, as shown in FIG. 1, the angle of the crankshaft of a test engine is detected. a first angle sensor A, a second angle sensor B that detects the angle of nine load shafts connected to the crankshaft and having an inertia imparting mechanism, and a data setter C that presets the moment of inertia value of the load shaft. , the angular velocity of the crankshaft obtained based on the signal from the data setting device C and the signal from the first angle sensor A, and the load obtained based on the signal from the data setting device C and the signal from the second angle sensor B. It is equipped with a calculation means for calculating the engine torque by correcting it using the angular velocity of the shaft.

Function Generally, the shaft torque T generated in an engine is expressed by the following well-known formula from the moment of inertia Tp of the output shaft due to the inertia imparting mechanism as a load and the friction torque FIC of R1.

T: rpF1F(ω) F; Engine output shaft speed rnd/5ee2ω
; Angular velocity rδd/spc Therefore, if the moment of inertia Tp and the torque F in the above equation are known, the shaft torque T can be measured by measuring the angular acceleration of the engine output shaft. This invention detects both the angular velocity of the crankshaft (output shaft) and the angular velocity of the load shaft based on the above equation.

This angular velocity value of the load shaft is corrected to the angular velocity of the crankshaft to obtain the dynamic acceleration value, and by this, the engine output torque during transient operation can be continuously measured even if there is a change in the rotation speed on the load side. be.

Example Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 2 shows an embodiment of the present invention, 21.

Assembly of 4-cylinder test engine 22 and transmission 23, 2
4 is a base on which the assembly 21 is placed and supported; 25 is a load shaft supported on a separate base 26;
is approximately equal to the weight of the vehicle, which is the inertia imparting mechanism, gfIJl
lt is provided with an inertia disk 27, and one end 2
5 is connected to the crankshaft 29 of the test engine 22 via a connection '@28 and a transmission @23. Furthermore,
The test engine 22 is equipped with a first degree sensor 3o for detecting the rotation angle of the crank 5290.
The base 26 is provided with a second angle sensor 31 that detects the rotation angle of the load shaft 25. Each group 1, 2
Output signals from the angle sensors 30, 31 are input to respective input terminals 33, 34 of the control unit 32, respectively.

Snap, this control unit 32&! .

The angle signals input to each input terminal 33 and 34 are converted into a rectangular wave (
waveform shaping circuits 35, 36 that shape each pulse signal into pulses), a micro 1 processor MPU 39 which is a calculation means that manually inputs each pulse signal via a latch circuit 37, 38, and the moment of inertia IP and friction torque F of the load @25. a data setter 4o that sets the signal in advance and outputs the signal to the MpU 39; a DA converter 41 that converts the output signal from the MPU 39 from digital to analog;
1 or M PTT 39 and outputs data such as output torque and engine speed to a recording device 42 . Further, in each of the latch circuits 37 and 38, a value obtained by counting a signal from a clock oscillator 44 (several megahertz) by each counter 45 and 46 and each of the above pulse signals are latched in synchronization.

Then, the MpU 39 reads the latched counter value in synchronization with each input angle signal, and stores this value in the memory 47. The counter value of this memory 47 is as shown in Fig. 3 (AI, fBl), and @3 Fig. IAI shows an example of a case where the time between crank angles 00 and 00 is measured by a counter. Looking at the series, the count number between 00 at point A is 0-order B and Q latched as Trl-1, and the difference δ between this latched I! and the counter full value is cleared. It is determined by the sum of the re-counted counts, 'pn==a
It becomes + h. In this way, the time T! between each 00 in the time series is calculated. 1. Tゎ-1 is measured. Fig. 3 f81 shows a case in which the time between the load shaft 250 angle θB is similarly measured using a counter, and the time series required time Tffl + Tff is calculated using the same method as the time measurement between the crank angle 00 described above.
It is measured in a centimeter of l -1.

Therefore, MpU39 uses these TT3. Tゎ-1 and T
, , the shaft torque of the test engine 220 is calculated from the following equation using the value of Tm-1, the moment of inertia from the data setting device 40, and the 4p torque.

XF(ωiT: Output torque of the engine 22 kg・mIp: fi load axis 25 moment of inertia l−kq・・5ec2θC: Crank angle (between signals) rad TT3.Tゎ1=between 0 in the time series Required time SθC However, θB: Signal amount angle (rad) of load shaft 25 Tm + T
m-1: Required time between time series 08 F(ω,): Load axis 2
Friction torque k and l expressed as a function of the rotational speed of 5
-m When accelerating with the torque determined by this calculation.

This is the output torque generated by the engine 22 during transient operation such as during deceleration, and is
Even if the rotation speed of the P4 load shaft 25 changes, the engine 22
The output torque can be measured continuously.

As a result, analysis and evaluation of engine performance during transient operating conditions becomes accurate and easy.

In addition, the output torque T calculated by the upper FMPU 39 is outputted to the output terminal 49 as an analog coefficient by the display 48 and the DAf converter 41, and is recorded in the recording device *42.
is output to. This recording device 42 is of a pen type similar to the conventional one, and is adapted to draw a time series waveform according to an input signal.

The throttle control 4 element 50 includes an Ml'U that calculates the current throttle valve opening amount signal based on a signal input from a throttle opening sensor (not shown).
A signal from 39 is sent.

Effects of the Invention As is clear from the above explanation, the transient shaft torque measuring device according to the present invention can be used to measure torque during a transient operation state in which a gear change operation of a transmission is performed, even if the rotational speed of the load field changes. It is also possible to continuously measure the output torque of the test engine. Therefore, engine performance can be accurately analyzed and evaluated.

[Brief explanation of the drawing]

Figure 1 is a control block diagram showing the main configuration of this invention, @2
The figure is an overall configuration diagram showing one embodiment of the present invention, and FIG.
IBI is an explanatory diagram showing the operation of this embodiment. FIG. 4 is an overall configuration diagram showing a conventional transient shaft torque measuring device. 22... Test engine, 23... Transmission device, 25.
...Load axis, 27...Inertia disk C inertia imparting mechanism), 2
9... Crankshaft, 30... First angle sensor, 31
... Sen in the second corner? , 32...control unit. 39...Calculating means, 40...Data setting value. Figure 2: Fertility time for 2 people Figure 3 (A) Figure 3 (B)

Claims (1)

[Claims] (1) The first step detects the angle of the crankshaft of the test engine.
an angle sensor; a second angle sensor that detects the angle of a load shaft connected to the crankshaft and having an inertia imparting mechanism; a data setter that presets a moment of inertia value of the load shaft; The angular velocity of the crankshaft obtained based on the signal and the signal of the first angle sensor,
A transient shaft torque measuring device characterized by comprising: arithmetic means for calculating engine torque by correcting it with the angular velocity of the load shaft obtained based on the signal of the data setter and the signal of the second angle sensor.