JPH07181110A - Tester for 4 wheel-driven car - Google Patents

Abstract

PURPOSE:To eliminate errors between a total of actual torques from dynamometers Dy1-Dy4 and a total of set torques of four wheels as generated by a correction signal for constant velocity control of a 4 wheel driven car. CONSTITUTION:A torque correction circuit 60 is provided and a signal after correction for constant velocity control is added up with an addition amplifier 61 and a total signal is compared with a set signal of a 4-wheel total torque setter 10. The resulting deviation signal Z is inputted into arithmetic devices 11-14 and torque control command signals a-1-a-4 are outputted from amplifiers 11A2-14A2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power train of a four-wheel independent drive vehicle using a dynamometer and a test device using a chassis dynamometer for testing four-wheel independent drive.
Particularly, it relates to torque control.

[0002]

2. Description of the Related Art In recent years, four-wheel drive vehicles (4WD vehicles) in which four wheels are independently driven have become widespread in passenger cars, leisure cars, and the like. Although this 4WD vehicle can obtain high running performance, it has problems such as braking phenomenon, energy loss and noise that are different from those of a normal specification vehicle. Has been clarified and improved.

As a test of a 4WD vehicle, there is a test of a power transmission system (power train system) such as a clutch, a transmission, a propeller shaft, a differential gear, etc. driven by four wheels independently and a test by a chassis dynamometer.

FIG. 2 is a conceptual explanatory view of this 4WD power train test apparatus, and 1 is a drive unit. There are three types of drive units, that is, a motor drive, a dynamometer drive, and an engine drive. In this embodiment, a DC motor is used. Reference numeral 2 is a four-wheel drive test piece, which is equipped with a differential center differential gear. 3 is a differential gear,
Reference numeral 4 denotes an input shaft connecting the drive unit 1 and the test piece 2, 5 a center shaft, 7 an output shaft, and 8 a clutch. D
y ₁ and Dy ₂ are front wheel load parts, Dy ₃ and Dy ₄ are rear wheel load parts, and each of these load parts is a dynamometer.

The control of the dynamometer of each load section is selected depending on the condition of the test piece and the purpose of the test, but the general basic control is of two types, speed and torque control, and differential rotation and differential Torque control is added. This torque control is performed as shown in FIG.

FIG. 3 is a basic circuit for torque control of a dynamometer, in which a dynamometer Dy is connected to an output shaft of a test piece, a thyristor rectifier Syc is used to convert AC power into variable DC power, which is added to the dynamometer Dy. Dynamometer D by controlling (phase) the gate of rectifier Syc
Control the speed and torque of y.

In the torque control, the torque sensor TS detects the torque applied to the dynamometer, and the detected torque is increased by the amplifier AP.
And Zohaba _1, compared with the setting signal for the detected torque signal and the torque setter ST comparator Co, and Zohaba the deviation signal in Zohaba unit AP _2, and input to the automatic torque control circuit ATR The automatic torque control circuit ATR outputs a torque control command signal a, and the torque control command signal a controls the gate of the thyristor rectifier Syc to control the torque of the dynamometer to be constant.

The above is a schematic description of the automatic torque control of _one dynamometer. The dynamometers Dy _{1 to} Dy in FIG. 2 are described.
It is provided on y ₄ . FIG. 4 is a detailed circuit diagram of the automatic torque control circuit of this 4WD power train test apparatus. In the figure, 10 is a four-wheel total torque setting device, 1
Reference numerals 1, 12, 13, and 14 denote first, second, third, and fourth computing units, respectively, to which the setting output signals of the four-wheel total torque setting unit are input. 20 is a front wheel rotation speed difference detector for detecting a rotational speed difference between the left and right front wheels, the rotational speed difference between the rotational speed S ₂ of the rotational speed S ₁ and Dy ₂ dynamometer Dy ₁ to (S ₁ -S ₂₎ The detected deviation signal is amplified by the amplifier 21 and input to the first calculator 11 and the second calculator 12. Reference numeral 30 denotes a front and rear wheel difference detector, which compares the product of the rotational speeds of the left and right front wheels with the product of the rotational speeds of the left and right rear wheels, and calculates (S ₁ + S ₂ ) − (S
₃ + S ₄ ) / 2 is detected, the minus signal B amplified by the amplifier 31 and the plus signal C inverted by the inversion amplifier 32 are output, and the signal C is the first and second arithmetic units. On 11, 12,
Further, the signal b is input to the third and fourth computing units 13 and 14, respectively. Reference numeral 40 denotes a rear wheel rotational speed difference detector, which detects a rotational speed difference between the rotational speeds S ₃ and S ₄ of the left and right rear wheel dynamometers Dy ₃ and Dy ₄ , and the deviation signal is amplified by the amplifier 41. Then 3rd and 4th
Input to the calculators 13 and 14. Also, the second, third and fourth
Compensation signals a, b, and c (all of which are based on the dynamometer Dy ₁ ) for digital integration for obtaining high-constant-speed control are supplied to the arithmetic units 12, 13, and 14 as velocity correction signal circuits 50.
Input from.

The output of the first calculator 11 is amplified by the amplifier AM ₁ and is output as a torque control command signal a- _{1 to} the gate of the thyristor rectifier Sy ₁ which controls the dynamometer Dy ₁ .

Similarly, the second to third arithmetic units 12, 13, 1
The output of 4 is amplified by the amplifiers AP ₂ , AP ₃ and AP ₄ , respectively, and added to the gate of each thyristor as torque control command signals a-2, a3 and a4, and each dynamometer D is added.
automatically controls the torque of the y ₁ ~Dy _4.

[0011]

As described above, if a speed correction circuit is provided and a speed correction signal is given in order to obtain a high constant speed control, the constant speed of the four output shaft wheels can be obtained, but each dynamometer. to a set torque of the four wheels total for this correction signal is input, if occurs the total and actual torque of the dynamometer Dy ₁ ~Dy ₄ do not match. In order to realize the test in the state close to the actual road, it is important to match the total actual torque with the set torque together with the constant speed control. Durability and noise measurement will not be possible.

Therefore, the present invention provides a test apparatus of this type which enables a highly accurate test by matching the total of the actual torques with the four-wheel total set torque even if a speed correction signal is applied. The purpose is to

[0013]

Means for Solving the Problems In the present invention, means for solving the above-mentioned problems are four-wheel independent drive specimens, dynamometers provided separately for each of these four wheels, and each of these dynamometers. 1st, 2nd, 3rd and 4th computing units that give an automatic torque control command to the dynamometer, and these 1st to 1st
The front wheel rotation speed that detects the difference in rotation speed between the left and right front wheels and the four-wheel total torque setting device that gives the four-wheel total torque setting signal to the fourth computing device and inputs the output signal to the first and second computing devices The difference detector, the rear wheel revolution difference detector that detects the difference in revolutions between the left and right rear wheels, and inputs the output signal to the third and fourth calculators, and the front left and right wheels and the left and right rear wheels. Of the front-rear wheel difference detector for detecting the difference in the number of revolutions of the motor and inputting the output signal to the third and fourth arithmetic units and the inverted output signal to the first and second arithmetic units, and any one of the dynamometer. In a test apparatus for a 4WD vehicle, which has a constant speed correction circuit for inputting a correction signal for constant speed control to another dynamometer to a calculator that issues an automatic torque control command to a dynamometer other than the reference, based on the rotation speed, The total of the output signals of the first to fourth arithmetic units and the total of the four wheels A torque correction circuit that compares the torque setting signal with the torque setting signal and inputs the deviation output signal to the first to fourth computing units is provided, and the sum of the four-wheel total torque setting and the actual torque matches during the constant speed control correction. To do so.

[0014]

The constant velocity correction signal from the constant velocity correction circuit is input to the computing unit of each dynamometer, and the four output shafts are controlled at constant velocity.

Further, the output signals from the respective arithmetic units after the constant velocity correction are summed by the torque correction circuit, and the output of this torque correction circuit is compared with the setting signal of the four-wheel total torque setting unit,
The deviation signal is input to each arithmetic unit, and an automatic torque control command is issued by the output signal, and each dynamometer operates at a constant speed.
The actual total torque that matches the set total torque of the four wheels is controlled.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in FIG. FIG. 1 is a circuit diagram of a torque control device according to an embodiment of the present invention. Parts corresponding to those in FIG.

Therefore, the present invention is characterized in that a torque correction circuit 60 is newly provided in the circuit of FIG. Increasing width unit 11A ₁ output signal a first of the torque correction circuit 60 the first to fourth computing unit _{11~14, 12A 1, 13A 1,} 14A 1
Is input to the addition thickening device 61, these signals are added, and the total signal and the signal of the reference four-wheel total torque setting device 10 are compared by the comparator 62, and the deviation signal is calculated. A torque correction signal Z is obtained by increasing the amplitude with the integral amplifier 63, and
It is input to the fourth arithmetic units 11 to 14. Then, this torque-corrected output signal is output to the second amplifiers 11A ₂ , 12A ₂ ,
Each of the dynamometers Dy _{1 to} Dy via 13A ₂ and 14A ₂
The gate of the thyristor rectifier Syc is controlled as the automatic torque control command signal of y ₄ .

In this way, the dynamometers Dy _{1 to} Dy _{4 are}
Since the torque correction signal Z is input to the automatic torque control command signal of 4 to perform the torque correction, the torque set by the reference four-wheel total torque setting device and the total torque match, and the correction signal for constant speed control is obtained. No error will occur even if "" is entered.

Although the power train test of four-wheel independent drive has been described above, the purpose is to eliminate the error between the four-wheel total set torque and the four-wheel total actual torque. It is needless to say that the same effect can be obtained by applying it to the chassis dynamometer.

[0020]

As described above, according to the present invention, there is no error between the reference set torque and the actual torque even if the high constant speed control is performed, and the high constant speed control does not cause an error. It enables highly accurate durability and noise measurement of the sample.

In addition, in the case of a test piece having a built-in viscous coupling, it is important to match the set torque together with constant speed control during acceleration / deceleration and large / small load conditions, and it is possible to perform a simulation that is extremely close to a real road. Becomes

[Brief description of drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention.

FIG. 2 is a basic configuration diagram of a power train test device for a 4WD vehicle.

[Fig. 3] Basic torque control circuit diagram

FIG. 4 is a conventional automatic torque control circuit diagram.

[Explanation of Codes] 10 ... Four-wheel total torque setting device 11, 12, 13, 14 ... Computing device 20 ... Front wheel rotational speed difference detector 30 ... Front and rear wheel difference detector 40 ... Rear wheel rotational speed difference detector 21, 31 , 41 ... Thickener 32 ... Inverting thickener 50 ... Velocity correction signal circuit 60 ... Torque correction circuit 61 ... Additive thickener 62 ... Comparator 63 ... Integral thickener Dy ₁ , Dy ₂ , Dy ₃ , Dy ₄ ... dynamometer

Claims (1)

[Claims] 1. A four-wheel independent drive test piece, a dynamometer provided separately for each of these four wheels, and first, second, third and third dynamometers for giving an automatic torque control command to each dynamometer. The four arithmetic units, the four-wheel total torque setting unit that gives the four-wheel total torque setting signals to these first to fourth arithmetic units, and the rotation speed difference between the left and right front wheels are detected to output their output signals as the first and second output signals. 2 front wheel rotation speed difference detector for input to the computing unit,
It detects the difference between the left and right rear wheel speeds and outputs the output signal
And a rear wheel rotational speed difference detector that is input to the fourth arithmetic unit, and a rotational speed difference between the left and right front wheels and the left and right rear wheels is detected and its output signal is inverted to the third and fourth arithmetic units. The first
Also, with reference to the rotational speed of any one of the front-rear wheel difference detector and the dynamometer that is input to the second computing unit, the automatic torque control is applied to the dynamometers other than the correction signal for constant speed control to the other dynamometers. In a test apparatus for a 4WD vehicle equipped with a constant velocity correction circuit for inputting to a computing unit that issues a command, the sum of output signals of the first to fourth computing units is compared with the four-wheel total torque setting signal, and the A test apparatus for a 4WD vehicle, comprising a torque correction circuit for inputting a deviation output signal to the first to fourth arithmetic units.