JP3047191B2 - Chassis dynamometer for four-wheel drive vehicles - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a chassis dynamometer for a four-wheel drive vehicle for performing a simulated running test of a vehicle having a four-wheel drive mechanism, and in particular, to a four-wheel drive for front and rear wheel power distribution and absorption. The present invention relates to a chassis dynamometer for a wheel drive vehicle.

[Conventional technology]

In a simulated driving test of an automobile, the automobile is fixed on a device in a test room, and in such a stationary state, the engine, the vehicle driving device, and the traveling device are in a state where the vehicle is actually traveling on the road. It is necessary to perform the same operation as.

The state in which the vehicle is running means stopping, accelerating (including starting acceleration and accelerating in the running state), shifting (including manual clutch, transmission operation, and automatic shifting operation), and constant. It means all vehicle running states such as speed (including gentle acceleration / deceleration by operation of the engine) and deceleration (including deceleration by operation of the brake device by operation of the engine brake and brake).

In addition, the operation similar to the state in which the vehicle is traveling means that the driving device, the rotation speed of the traveling device, and the torque move with the same values as when traveling on the road. I have.

For this reason, a chassis dynamometer for a four-wheel drive vehicle on which the vehicle is mounted, when viewed from the vehicle engine, the driving device, and the traveling device, outputs the same front wheel power and rear wheel power as if the vehicle were traveling on a road. It is a device that absorbs, instead of the road surface, a roller with which the wheel is in contact is provided, and a torque corresponding to the load applied to the front and rear wheels by running drive is applied to the roller shaft by a dynamometer coupled to the roller shaft of each roller. The entire load of the vehicle must be distributed to the front and rear dynamometers.

Another indispensable requirement of a chassis dynamometer for a four-wheel drive vehicle is that the front and rear wheel side roller surfaces described above must always be the same. Since the front and rear wheels maintain the same positional relationship during traveling on the road in the driving state of, the tire speeds of the front and rear wheels are always the same when traveling on the road.

In the first example, a chassis dynamometer for a four-wheel drive vehicle according to the prior art has a front-wheel-side roller 51 and a rear-wheel-side roller 52 having the same diameter as shown in FIG. It is supported on the machine base so as to be rotatable in parallel with the same spacing as above. A front wheel-side ATR (automatic torque control) dynamometer 54 is connected to one end of a rotation shaft 53 of the front wheel-side roller 51, and a front wheel-side tachometer 55 is provided at the other end.
A torque meter 57 is provided at one end of the rotation shaft 56 of the rear wheel roller 52.
ASR (automatic speed control) DC motor 58 is connected via the.

The torque meter 57 is connected to input the detection output to the front wheel side ATR controller 60 via the inverter 59.

The tachometer 55 is connected to the ASR controller 61 so as to input the detection output to the ASR controller 61.
It is connected to control the R DC motor 58.

In the first example, a four-wheel drive vehicle as a test vehicle is mounted on a chassis dynamometer for a four-wheel drive vehicle, that is, both front wheels of the four-wheel drive vehicle are on front wheel side rollers 51 and both rear wheels are rear. The four-wheel drive vehicle placed on each of the wheel-side rollers 52 performs the same operation as in the state where the vehicle is actually traveling on the road.

The front wheel-side roller 51 is driven by the front wheels to rotate in the opposite direction to the front wheels at a peripheral speed equal to the peripheral speed of the front wheels. At that time, the front wheel side
Since a predetermined load is applied to the ATR dynamometer 54 by the front wheel side ATR controller 60, the front wheels are rotationally driven through the front wheel side rollers 51 in a state where a predetermined torque is absorbed.

Then, the rotation speed of the front wheel side roller 51 is detected by the front wheel side tachometer 55 via the rotation shaft 53, the detection output is input to the ASR controller 61 as a reference rotation speed, and the ASR DC motor 58 The ASR controller 61 controls the rotation shaft 56, that is, the rear wheel roller 52 to rotate at the reference rotation speed.
That is, the rear wheel roller 52 rotates so as to follow the rotation speed of the front wheel roller 51. Therefore, the front wheel tire and the rear wheel tire rotate at the same peripheral speed.

At that time, the rear wheel-side roller 52 is driven to rotate by the rear wheel and is also driven to rotate by the ASR DC motor 58. As a result, if torque transfer occurs between the ASR DC motor 58 and the The applied torque is detected by a torque meter 57, and the detected torque is inverted by a reversing device 59 and then input to the side ATR controller 60, and a load corresponding to the torque is applied to the front wheel side ATR controller 60. Is added to the ATR dynamometer 54 for all members.

The control as described above progresses, and as a result, the front-wheel ATR
A predetermined load is applied to the dynamometer 54 by the front wheel side ATR controller 60, and while absorbing a predetermined torque from the front wheel via the front wheel side roller 51, the front wheel side roller is driven at a peripheral speed corresponding to the peripheral speed of the front wheel. Rotate 51. At the same time, the rear wheel roller
The 52 is forced to rotate at exactly the same speed as the front wheel-side roller 51, and absorbs, from the rear wheels, the difference between the total torque of the front and rear wheels of the four-wheel drive vehicle and the predetermined torque of the front wheels.

As a second example, as shown in FIG. 6, a front-wheel-side roller 51 and a rear-wheel-side roller 52 similar to the above-described example are provided, and one end of a rotation shaft 53 of the front-wheel-side roller 51 has a front-wheel-side ATR ( An automatic torque control) dynamometer 54 is connected, and a front wheel side tachometer 55 is provided at the other end, and a rear wheel side ATR (automatic torque control) dynamometer is provided at one end of a rotation shaft 56 of the rear wheel side roller 52. A meter 62 is coupled to the other end, and a rear wheel-side tachometer 63 is provided at the other end.

The front wheel ATR (automatic torque control) dynamometer 54 and the rear wheel ATR (automatic torque control) dynamometer 62
A front wheel side ATR controller 60 and a rear wheel side ATR controller 64 are connected respectively.

The front wheel-side tachometer 55 and the rear wheel-side tachometer 63 are connected to input a detection output to the comparator 65.
Reference numeral 65 is connected to input an output to the rear wheel side ATR controller 64.

In the second example, similarly to the first example, the test vehicle performs the same operation on the four-wheel-drive chassis dynamometer as when the vehicle is actually running on the road.

The front wheel-side roller 51 is driven by the front wheels to rotate in the opposite direction to the front wheels at a peripheral speed equal to the peripheral speed of the front wheels. At that time, the front wheel side
Since a predetermined load is applied to the ATR dynamometer 54 by the front wheel side ATR controller 60, the front wheels are rotationally driven through the front wheel side rollers 51 in a state where a predetermined torque is absorbed.

The rear wheel 52 is also driven by the rear wheel to rotate in the opposite direction to the rear wheel at a peripheral speed equal to the peripheral speed of the rear wheel. At that time, rear wheel side AT
Since a predetermined load is applied to the R dynamometer 62 by the rear wheel side ATR controller 64, the rear wheel is rotationally driven through the rear wheel side roller 52 in a state where a predetermined torque is absorbed.

Then, the rotation speed of the front wheel side roller 51 is detected by the front wheel side tachometer 55 via the rotation shaft 53, and the rear wheel side roller 52
Is detected by the rear wheel-side tachometer 63 via the rotating shaft 56, and both detection outputs are input to the comparator 65.

If there is a difference between the rotation speed of the side roller 51 and the rotation speed of the rear wheel side roller 52, the difference is input to the rear wheel side ATR controller 64 as a comparison output of the comparator 65, and the ATR controller 64 The load applied to the rear-wheel ATR dynamometer 62 is controlled to change the rotation speed of the rear-wheel roller 52 so that the comparison output becomes zero.

The control as described above progresses, and as a result, the front-wheel ATR
A predetermined load is applied to the dynamometer 54 by the front wheel side ATR controller 60, and while absorbing a predetermined torque from the front wheel via the front wheel side roller 51, the front wheel side roller is driven at a peripheral speed corresponding to the peripheral speed of the front wheel. Rotate 51. At the same time, the rear wheel-side ATR dynamometer 62 absorbs torque from the rear wheel 52, which rotates at the same rotational speed as the front wheel roller 51, that is, the rear wheel that is forced to rotate at the same peripheral speed as the front wheel. The load is controlled by the rear wheel side ATR controller 64 so as to apply as much load as possible.

[Problems to be solved by the invention]

The first example of the above-described prior art four-wheel drive vehicle chassis dynamometer performs torque control on the rear wheels based on the constant speed control of the front and rear wheels based on the detection speed of the rotation speed of the front wheel rollers. Moreover, the torque control is directly performed only on the front wheel side, and the rear wheel side is only controlled at a constant speed, and the torque control is performed indirectly. Therefore, the control accuracy of the rear wheel torque is low due to the torque control based on the detection of the rotational speed, and the torque control on the rear wheel side is indirect by the constant speed control and the torque control on the front wheel side. Since active torque distribution cannot be performed, it is difficult to perform appropriate torque distribution control of the entire four wheels according to the running state.

Similarly, the second example has a torque control system for each of the front and rear wheels, but based on the detected speed difference between the rotation speeds of the front wheel side roller and the rear wheel side roller in order to secure the uniformity of the front and rear wheels. Thus, the rear wheel side torque is controlled at intervals. Therefore, the torque control on the rear wheel side has low accuracy, and as a result, the torque distribution is not accurately performed, so that it is difficult to appropriately perform the torque distribution control of the entire four wheels according to the traveling state.

[Means for solving the problem]

The chassis dynamometer for a four-wheel drive vehicle according to the present invention includes a front wheel-side roller and a rear wheel-side roller, which are rotatably supported on the machine base at the same interval as the front and rear wheels of the automobile, and the rotation axis of one of the rollers. Combined first ATR (automatic torque control) torque absorption drive and tachometer, second ATR (automatic torque control) torque absorption drive and ASR (automatic speed control) torque absorption drive coupled to the rotating shaft of the other roller Device, torque detecting means for detecting torque between the rotating shaft of the other roller and the ASR torque absorbing drive device,
・ Control devices for the second ATR torque absorbing drive device and the ASR torque absorbing drive device, a torque setting device for setting a load torque value for the first and second ATR torque absorbing drive devices, and a load torque value set in the torque setting device. A torque distributor for distributing and inputting to the control device of the first and second ATR torque absorbing drive devices at a predetermined load torque distribution ratio;
The torque detecting means is connected so that a detection output thereof is input to a control device of the first ATR torque absorption driving device, and the control device makes the detection output of the torque detection means zero according to the detected torque value. Control the first ATR torque absorption drive device so that the tachometer is connected to input the detection output to the control device of the ASR torque absorption drive device,
The control device controls the ASR torque absorption drive device such that the roller on the ASR torque absorption drive device side and the roller on the first ATR torque absorption drive device rotate at the same speed according to the detection output of the tachometer. It has become.

Further, if necessary, a torque discriminating device for discriminating the magnitude of the detected torque value of the torque detecting means, and the detected torque value of the torque detecting means is distributed at a predetermined load torque distribution ratio by the discrimination of the torque discriminating device. Another torque distributor for distributing and inputting to the control device of the second ATR torque absorption drive device is additionally provided, and the control device of the first ATR torque absorption drive device receives the detected torque value and the added torque from the another distributor. In accordance with the distributed torque value, the control device of the second ATR torque absorption drive device controls the respective ATR torques so that the detection output of the torque detecting means becomes zero in accordance with the distributed torque value from the additional distributor. The absorption driving device is controlled.

As another type of means, further, the torque detecting means is not connected to be input to the control device of the first ATR torque absorption drive device, and the control device of the first ATR torque absorption drive device and the second ATR torque The control device of the absorption drive is
Each ATR torque absorption drive device is controlled so that the detection output of the torque detection means becomes zero according to the distribution torque value from the added another distributor.

[Action]

In the chassis dynamometer for a four-wheel drive vehicle, the four-wheel drive vehicle to be tested is mounted on the chassis dynamometer for the four-wheel drive vehicle, that is, both front wheels of the four-wheel drive vehicle are on one roller, The wheels are placed on the other roller respectively,
In a four-wheel drive vehicle, the same operation is performed as when the vehicle is actually traveling on the road. In other words, all vehicle running such as stopping, accelerating (accelerating by driving operation or running road condition), constant speed (including gentle acceleration / deceleration by engine operation), deceleration (deceleration by engine braking and braking operation and running road condition), etc. Operation of the state is performed.

Each roller is rotationally driven by the front wheel and the rear wheel in a direction opposite to the front wheel at the same peripheral speed as the peripheral speed of the front wheel and the rear wheel.

At this time, in the torque setting device for setting the additional torque value for the first and second ATR torque absorption driving devices, the full load torque value applied to the front and rear wheels of the vehicle corresponding to the desired actual running state is input and set. .

A load torque signal of the set full load torque value is input to the torque distributor, and the full load torque value is distributed at a predetermined distribution ratio to each of the front wheels and the rear wheels by the torque distributor, and from the torque distributor, The distributed torque signal of one of the wheels is input to the control device (first ATR controller) of the first ATR torque absorption drive device, and the control device (2ATR) of the second ATR torque absorption drive device is input.
To the controller), a distributed torque signal on the other wheel side is input.

Therefore, a load corresponding to a predetermined distribution torque value based on the distribution torque signal on one wheel side is applied to the first ATR torque absorption driving device by the first ATR controller, so that one vehicle is driven by the roller on one wheel side. Are driven in a state where a predetermined distribution torque is absorbed via the. Similarly, a load corresponding to a predetermined distribution torque value based on the distribution torque signal on the other wheel side is applied to the second ATR torque absorption drive device by the ATR controller on the other wheel side. Are driven to rotate in a state where a predetermined distribution torque is absorbed through the rollers on the wheel side of. That is, the sum of the distribution torque value absorbed by one wheel and the distribution torque value absorbed by the other wheel is equal to the full load torque value set by the load torque setting device.

In the rotation of each roller by the front and rear wheels, the rotation speed of one roller is detected by a tachometer, and the detection output is used as a reference rotation speed to control the ASR torque absorption drive control device (ASR controller) And the ASR controller controls the ASR torque absorption driving device to rotationally drive the other roller at the reference rotational speed.

That is, the other roller rotates so as to follow the rotation speed of the one roller. Since the peripheral speeds of both rollers are the same, the outer peripheral surfaces thereof are in the same state as the actual traveling road surface.
That is, the front wheel and the rear wheel rotate at the same speed regardless of the traveling speed as long as there is no slip between the tire surfaces of the front and rear wheels and the outer peripheral surfaces of both rollers, as in actual traveling.

Therefore, the ASR torque absorption drive unit adds the rotation drive of the other roller to the rotation drive of the other wheel, or changes in the predetermined distribution torque, or the delay of the control system in shifting the vehicle and the other roller causes the ASR torque to be reduced. When a torque is transmitted and received to and from the absorption driving device, the transmitted and received torque is detected by the torque detecting means, and the detected torque is inverted in the positive / negative direction and added to a predetermined distribution torque value to perform the first ATR control. Input to the container. A load corresponding to the resulting total torque value is applied to the first ATR torque absorption driving device by the ATR controller on one wheel side, and the wheels are driven to rotate in a state where the total torque is absorbed via the rollers. You.

If the above control proceeds, as a result, the roller on one wheel side is applied with a predetermined load by the first ATR torque absorption driving device and absorbs a predetermined distribution torque from one wheel. While rotating, the roller on the other wheel also rotates at exactly the same speed as the roller on one wheel while applying a predetermined load by the second ATR torque absorption drive and absorbing a predetermined distribution torque from the other wheel. And the torque detected by the torque detecting means becomes zero.

That is, the same state of the peripheral speed of the roller on one wheel side and the peripheral speed of the roller on the other wheel side is maintained, and the same state as the actual traveling on the road is obtained, and the desired state set by the load torque setting device is further set. When the full load torque value of the vehicle in the actual traveling state is distributed to one wheel side and the other wheel side at the distribution ratio set by the torque distributor, the distributed load becomes the first ATR torque absorption driving device and the second ATR torque absorption. Added to the drive,
Each of the one wheel and the other wheel is rotationally driven under the same load as in the actual running state.

Further, in a form in which a torque discriminating device and another distributor connected thereto are added, the detected torque of the torque detecting means is input to the torque discriminator in addition to being inverted and input to the first ATR controller, If the magnitude is determined and the detected torque is equal to or greater than a predetermined value within a range in which the control hunting occurs, a determined value is output. In another torque distributor, the detected torque is a correction torque signal corresponding to the determined value. The correction and the luk signal are applied to the first ATR torque absorption drive as a correction distribution load on one wheel side, and are inverted as a correction distribution load on the other wheel side to be inverted and the second ATR torque absorption drive Is added to

In a modified example, the detected torque from the torque detecting means is inverted to positive / negative and is not input to the first ATR controller, and the corrected distribution load including the corrected portion is supplied from the separate torque distributor to the first and second ATR torques. In addition to the absorption drive.

Therefore, when the torque detected by the torque detecting means is large, the distribution ratio to one vehicle side and the other wheel side is greatly corrected, and the predetermined torque distribution control and the constant speed control for one wheel and the other wheel are performed. And without delay.

〔Example〕

 An embodiment of the present invention will be described with reference to the drawings.

In the chassis dynamometer for a four-wheel drive vehicle of the first embodiment tightened in FIG. 1, the front wheel-side roller 1 and the rear wheel-side roller 2 having the same diameter rotate in parallel at the same interval as the front and rear wheels of the automobile. It is freely supported on the machine base. A front wheel-side ATR (automatic torque control) dynamometer 4 is connected to one end of a rotating shaft 3 of the front wheel-side roller 1, and a front wheel-side tachometer 5 is provided at the other end. Axis 6
One end is connected to a rear wheel side ATR (automatic torque control) dynamometer 7, and the other end is connected to an ASR (automatic speed control) DC motor 9 via a rear wheel side shaft torque meter 8.
Further, the ASR DC motor 9 is provided with a rear wheel side tachometer 10.

The front wheel side swing type torque meter 11 of the front wheel side ATR dynamometer 4 is directly connected, and the rear wheel side shaft torque meter 8 is connected to an inverter 12.
Are connected to the front-wheel-side absorption torque calculator 13, and the respective detection outputs are input to the front-wheel-side absorption torque calculator 13. The front wheel side absorption torque calculator 13 is connected to the front wheel side ATR controller 14 so that the calculated output is input to the front wheel side ATR controller 14, and the front wheel side ATR controller 14 further includes a front wheel side ATR
The dynamometer 4 is connected to the front ATR dynamometer 4 so as to control the dynamometer 4.

The front wheel side absorption torque calculator 13 will be described in more detail. As shown in FIG.
Is composed of a control current calculator 131, a comparator 132 and an adder 133 sequentially connected, a torque distributor 23 and an inverter 12 connected to an adder 133, and a front wheel side swing of the front wheel side ATR dynamometer 4. Type torque meter 11 compares the detected output with a comparator 132
It is connected to input to.

The front wheel tachometer 5 and the rear wheel tachometer 10 are connected so that each detection output is input to the comparator 15.
Is connected to an ASR control current calculator 16, the ASR control current calculator 16 is connected to the ASR controller 17 so that its output is input to the ASR controller 17, and the ASR controller 17 is further connected to the ASR DC motor. 9 to control the ASR DC motor 9.

Further, the rear wheel side swing type torque meter 18 of the rear wheel side ATR dynamometer 7 uses a detection output of the rear wheel side absorption torque calculator.
The rear-wheel-side absorption torque calculator 19 is connected to the rear-wheel-side ATR controller 19 so as to input the calculated output to the rear-wheel-side ATR controller 20. The ATR controller 20 is connected to the rear ATR dynamometer 7 so as to control the rear ATR dynamometer 7.
It is connected to the.

The rear wheel side absorption torque calculator 19 is the same as the front wheel side absorption torque calculator 13 (however, the adder can be omitted), and the torque distributor 23 is connected to the comparator 192 directly or via the adder 193. The rear wheel side swing type torque meter 18 of the rear wheel side ATR dynamometer 7 is connected so as to be input to the comparator 192.

The load torque setter 21 is connected to the torque distributor 23 so as to input the set predetermined full load torque to the torque distributor 23, and is connected between the load torque setter 21 and the torque distributor 23 as necessary. A front and rear wheel torque distribution ratio discriminator 22 is interposed. The torque distributor 23 is connected to each of the front-wheel-side absorption torque calculator 13 and the rear-wheel-side absorption torque calculator 19 so as to distribute and input the input load torque at a predetermined distribution ratio.

The load torque setter 21 is connected to the front wheel-side tachometer 5, and various traveling condition data from the input means and the detection output of the front wheel-side tachometer 5 are input.
The front wheel side oscillating torque meter 11 and the rear wheel side oscillating torque meter 18 are connected to the rear wheel torque distribution ratio discriminator 22, and the respective detected torques are input.

In the chassis dynamometer for a four-wheel drive vehicle according to the second embodiment shown in FIG. 2, in addition to the torque distributor 23 in the chassis dynamometer for the four-wheel drive vehicle of the first embodiment, another torque distributor is provided. 24 is additionally provided.

The torque distributor 24 is directly connected to the rear wheel-side shaft torque meter 8 and connected via a front and rear wheel torque distribution ratio discriminator 25. The output of the rear wheel-side shaft torque meter 8 is transmitted to the torque distributor 24. In addition to the input to the front and rear wheel torque distribution ratio discriminator 25, the front and rear wheel torque distribution ratio discriminator
The output of 25 is input to the torque distributor 24.

The torque distributor 24 is a front-wheel-side absorption torque calculator.
13 and is connected to the rear wheel side absorption torque calculator 19 via the inverter 26.

The rear wheel side absorption torque calculator 19 will be described in more detail. The rear wheel side absorption torque calculator 19 is similar to the front wheel side absorption torque calculator 13 as shown in FIG.
1, a comparator 192 and an adder 193 are sequentially connected, a torque distributor 23 and an inverter 26 are connected to an adder 193, and a rear-wheel oscillating torque meter 18 of the rear-wheel ATR dynamometer 7 Are connected to input the detection output to the comparator 192.

In a modification of the second embodiment, an inverter for connecting the rear wheel side shaft torque meter 8 and the front wheel side absorption torque calculator 13 in the chassis dynamometer for a four-wheel drive vehicle of the second embodiment.
The connection circuit in which 12 is interposed can be omitted.

In each of the above embodiments, a drive current detector 27 is interposed in the input circuit from the ASR controller 17 to the ASR DC motor 9 as shown in FIG.
The drive current detector 27 is connected to the inverter 1 via the torque calculator 28.
2. The drive current value to the ASR DC motor 9 which is connected to the torque distributor 24 and the front and rear wheel torque distribution ratio discriminator 25 and detected by the drive current detector 27 is converted as a torque value by the torque calculator 28, and The output may be input to the inverter 12, the torque distributor 24, and the front and rear wheel torque distribution ratio discriminator 25 in the same manner as the detection output by the wheel side shaft torque meter 8.

Further, the front wheel-side ATR dynamometer 4 and the rear wheel-side ATR dynamometer 7 in each of the above embodiments may be ATR DC motors, in which case, the oscillating torque meters 11, 18
The shaft torque meters 11 ', 18' on the rotating shafts 3, 6 are provided. Similarly, the ASR DC motor 9 on the rear wheel side may be an ASR dynamometer.
Becomes the oscillating torque meter 8 '.

The operation and operation of the above-described four-wheel drive vehicle chassis dynamometer will be described.

First, in the chassis dynamometer for the four-wheel drive vehicle of the first embodiment, the four-wheel drive vehicle to be tested is mounted on the chassis dynamometer for the four-wheel drive vehicle, that is, both front wheels of the four-wheel drive vehicle are front wheels. On the side roller 1, both rear wheels are
Each of the four-wheel-drive vehicles mounted on the top performs the same operation as the state in which the vehicle is actually traveling on the road. That is, all vehicle running, such as stopping, accelerating (accelerating by driving operation or running road condition), constant speed (including gentle acceleration / deceleration by engine operation), and deceleration (deceleration by engine braking and braking operation or running road condition). Operation of the state is performed.

The front wheel-side roller 1 is rotationally driven by the front wheels at the same peripheral speed as the front wheels, in the direction opposite to the front wheels.

The rear wheel speed roller 2 is also driven by the rear wheel to rotate in the opposite direction to the rear wheel at a peripheral speed equal to the peripheral speed of the rear wheel.

At this time, the load torque setting unit 21 may input and set the total load torque applied to the front and rear wheels of the vehicle as a desired fixed value. The vehicle speed, acceleration, and jerk, which are various conditions corresponding to the running state, are real-time parameters synchronized with the engine control and the shifting operation of the vehicle, and various data input from the data input device (the inertial mass of the vehicle, the center of gravity of the vehicle, etc.). The total load torque value applied to the front and rear wheels of the vehicle, which fluctuates based on the position, the rotary unit equivalent inertia, the air resistance, the driving shaft system resistance, the road surface gradient, the road surface condition, the tire condition, and the like, may be set. For example, as will be described later, the rotation speed of the front wheel, that is, the front wheel side roller 1 is detected by the front wheel side tachometer 5 and input to the load torque setting device 21 as a reference rotation speed signal, and the air resistance due to the speed of the vehicle is taken into consideration. Full load torque value is set.

A load torque signal of the set full load torque value is input to the torque distributor 23, and the torque distributor 23
The full load torque value is distributed to each of the rear wheels at a predetermined distribution ratio. From the torque distributor 23, the front wheel side absorption torque calculator 13
The front wheel side distributed torque signal is input to the front wheel side ATR controller 14 through the rear wheel side ATR controller 14, and the rear wheel side AT
The rear wheel side distributed torque signal is input to the R controller 20.

Therefore, a load corresponding to a predetermined distribution torque value based on the front wheel side distribution torque signal is applied to the front wheel side ATR dynamometer 4 by the front wheel side ATR controller 14, so that the front wheel passes through the front wheel side roller 1 to a predetermined load. It is driven to rotate while the distribution torque is absorbed. Similarly, a load corresponding to a predetermined distribution torque value based on the rear wheel side distribution torque signal is applied to the rear wheel side ATR dynamometer 7 by the rear wheel side ATR controller 20. 2 is driven to rotate in a state where a predetermined distribution torque is absorbed. That is, the sum of the distribution torque value absorbed by the front wheels and the distribution torque value absorbed by the rear wheels is equal to the full load torque value set by the load torque setting device 21.

Only when the absorption of torque by the front and rear wheels is not complete, deviations occur between the torques detected by the front-wheel swing torque meter 11 and the rear-wheel swing torque meter 18 and the respective distribution torques. Deviation torque is front wheel side absorption torque calculator
13.The feedback torque is fed back to the front wheel ATR controller 14 and the rear wheel ATR controller 20 via the rear wheel side absorption torque calculator 19, and the front wheel side and rear wheel side absorption torque values are determined based on the feedback. Is maintained.

This feedback control will be described in more detail with reference to FIG. 3. On the front wheel side, the adder 133 adds the distribution torque signal from the distributor 23 and the correction torque signal from the inverter 12 described later, and sets the command torque value. (On the rear wheel side, the distributed torque signal from the distributor 23 is input to the comparator 192 as a commanded torque value.)
In (192), the deviation of the detected torque from the front wheel side swing type torque meter 11 (rear wheel side swing type torque meter 18) from the command torque value is calculated, and the front wheel side ATR is set so that the difference becomes zero. Feedback control is performed in the controller 14 (rear wheel side ATR controller 20).

In the rotation of the front wheel side roller 1 and the rear wheel side roller 2 by the front wheel and the rear wheel, the rotation speed of the front wheel side roller 1 is detected by the front wheel side tachometer 5 via the rotation shaft 3,
The rotation speed of the rear wheel-side roller 2 is detected by the rear wheel-side tachometer 10 via the rotation shaft 6 and input to the comparator 15 as the detected rotation speed. You.

If there is a difference between the reference rotation speed and the detected rotation speed,
The difference signal from the comparator 15 is input to the ASR control current calculator 16, and a rotation speed command signal from the ASR control current calculator 16 is input to the ASR controller 17 so that the difference becomes zero. The controller 17 controls the rotation speed of the ASR DC motor 9. By this control, the detected rotation speed is maintained at the same speed as the reference rotation speed. That is, the rear wheel-side roller 2
It is rotated by the R DC motor 9 so as to follow the rotation speed of the front wheel side roller 1.

Therefore, the peripheral speed of the rear wheel-side roller 2 is the same as the peripheral speed of the front wheel-side roller 1, so that the outer peripheral surfaces of the front wheel-side roller 1 and the rear wheel-side roller 2 are in the same state as the actual traveling road surface. Become. That is, the front wheel and the rear wheel are at the same speed as long as there is no slip between the tire surface of the front wheel and the rear wheel and the outer peripheral surface of the front wheel side roller 1 and the rear wheel side roller 2 irrespective of the running speed as in the actual running. Will rotate.

Therefore, the ASR DC motor 9 adds the rotational drive to the rear wheel-side roller 2 to the rotational drive of the rear wheel, changes the predetermined distribution torque, or delays the control system in shifting the vehicle. When torque is transmitted and received between the DC motor 9 and the DC motor 9, the transmitted and received torque is detected by the rear-wheel-side shaft torque meter 8. It is input to the side absorption torque calculator 13, added to a predetermined distribution torque value, and then input to the front wheel side ATR controller 14. A load corresponding to the resultant torque value is applied to the front wheel side ATR dynamometer 4 by the front wheel side ATR controller 14. Therefore, the front wheels are driven to rotate in a state in which the above-mentioned combined torque is absorbed via the front wheel-side rollers 1. Note that feedback control of the detected torque from the front wheel side swing torque meter 11 is the same as described above.

If the above control proceeds, as a result, the front wheel-side roller 1 rotates while absorbing a predetermined distribution torque from the front wheels by applying a predetermined load by the front wheel-side ATR dynamometer 4 and rearward. The wheel-side roller 2 also rotates at exactly the same speed as the front wheel-side roller 1 while receiving a predetermined load from the rear wheel ATR dynamometer 7 and absorbing a predetermined distribution torque from the rear wheel. The detected torque from the shaft torque meter 8 becomes zero.

That is, the same state of the peripheral speed of the front wheel side roller 1 and the peripheral speed of the rear wheel side roller 2 is maintained, becomes the same state as the actual traveling on the road, and furthermore, the desired actual value set by the load torque setting unit 21. When the full load torque value of the vehicle in the running state is distributed to the front wheel side and the rear wheel side at the distribution ratio set by the torque distributor 23, the distributed load is applied to the front wheel side ATR dynamometer 4 and the rear wheel side ATR dynamometer 7. In addition, each of the front wheels and the rear wheels is rotationally driven under the same load as in the actual running state.

In the case where the front and rear wheel torque distribution ratio discriminator 22 is interposed, when the torque is detected by the front wheel side oscillating torque meter 11 and the rear wheel side oscillating torque meter 18, the detected output is Since the torque is input to the torque distribution ratio discriminator 22, the torque detected by the front wheel side oscillating torque meter 11 and the rear wheel side oscillating torque meter 18 may differ from the predetermined distribution ratio even in the result of the above control. In the case of hunting or hunting, it is determined, the distribution ratio itself set in the torque distributor 23 is corrected, and the ratio of the detection output from the front wheel side oscillating torque meter 11 / rear wheel side oscillating torque meter 18 is determined. Is controlled to change the distribution ratio to an appropriate distribution ratio according to the actual running of the vehicle such that the corrected distribution ratio becomes equal to or less than a predetermined value with respect to the corrected distribution ratio.

In the chassis dynamometer for the four-wheel drive vehicle of the second embodiment, in addition to the operation of the first embodiment, the rear wheel-side shaft torque is further increased by maintaining the front wheel-side roller 1 and the rear wheel-side roller 2 at the same rotational speed. The detected torque of the meter 8 is calculated by the inverter 12
Is input to the front and rear wheel torque distribution ratio discriminator 25, the magnitude of which is discriminated. If the detected torque is equal to or larger than a predetermined value in a range in which hunting of control occurs, a discrimination value is output, and the torque is output. In the distributor 24, the torque distributor
The detected torque of the rear-wheel-side shaft torque meter 8 that is directly input to 24 is converted into a corrected torque signal corresponding to the discrimination value, and the corrected torque signal is used as a front-wheel-side corrected distribution load by the front-wheel-side absorption torque calculator 13 Is added and input to the rear wheel side absorption torque calculator 19 as a correction distribution load on the rear wheel side.

More specifically, referring to FIG. 3, the distribution torque signal from the distributor 23 and the correction torque signal from the inverter 26 are added by the adder 193 in the rear-wheel-side absorption torque calculator 19, and the added Input to 192, Comparator 1
In 92, the deviation of the detected torque from the rear wheel side oscillating torque meter 18 from the command torque value is calculated, and the feedback control is performed in the rear wheel side ATR controller 20 so that the deviation becomes zero.

Therefore, when the detected torque of the rear-wheel-side shaft torque meter 8 is large, the distribution ratio to the front-wheel and rear-wheel sides is greatly corrected, and the predetermined torque distribution control and the constant-speed control for the front and rear wheels are performed. Done without delay.

In the modified example, in the above-described embodiment, the torque distribution is performed such that the detected torque input from the first rear wheel side shaft torque meter 8 via the inverter 12 directly to the front wheel side absorption torque calculator 13 is also inverted. The obtained torque command signal is input from the torque distributor 24 to the front wheel side absorption torque calculator 13.

In each of the above embodiments, as shown in FIG. 4, when the drive current detector 27 is interposed in the input circuit from the ASR controller 17 to the ASR DC motor 9 as torque detection means,
The drive current detector 27 detects a drive current value to the ASR DC motor 9. In a DC motor, the drive current changes linearly with the torque, so that the drive current is converted as a torque value by the torque calculator 28, and the inverter 12, the torque distributor 24, and the This is input to the front and rear wheel torque distribution ratio discriminator 25.

〔The invention's effect〕

The chassis dynamometer for a four-wheel drive vehicle includes an engine, a vehicle drive device, and a traveling device in a state where the vehicle is stationary. Drive,
From the viewpoint of the traveling device, the requirement that the front wheel power and the rear wheel power distributed as in the state of traveling on the road be absorbed and the roller surfaces on the front and rear wheels must always be the same. Desired.

In response to this requirement, the chassis dynamometer for a four-wheel drive vehicle according to the conventional technology satisfies the requirement that at least the roller surfaces on the front wheel side and the rear wheel side are always the same, but the front wheel power corresponding to changing running conditions While the requirement of the distribution and absorption control of the rear wheel power cannot be accurately realized, the above-described two requirements can be accurately realized by the chassis dynamometer for the four-wheel drive vehicle of the present invention.

As a result, an accurate and versatile performance test of a four-wheel drive vehicle, which is impossible with a chassis dynamometer for a four-wheel drive vehicle according to the prior art, can be performed.

[Brief description of the drawings]

FIG. 1 is a block diagram of a chassis dynamometer for a four-wheel drive vehicle according to a first embodiment of the present invention. FIG. 2 is a block diagram of a chassis dynamometer for a four-wheel drive vehicle according to a second embodiment of the present invention. FIG. 3 is a block diagram of a chassis dynamometer for a four-wheel drive vehicle according to a third embodiment of the present invention. FIG. 4 is a torque for an ASR DC motor of a chassis dynamometer for a four-wheel drive vehicle according to the embodiment of the present invention. FIGS. 5 and 6 are block diagrams of a conventional chassis dynamometer for a four-wheel drive vehicle. 1: Front wheel side roller, 2: Rear wheel side roller 3, 6: Rotating shaft, 4: Front wheel side ATR dynamometer 5: Front wheel side rotational speed meter 7: Rear wheel side ATR dynamometer 8: Rear wheel side shaft torque meter, 9: ASR DC motor 10: Rear wheel side tachometer 11: Front wheel side swing type torque meter, 12, 26: Inverter 13: Front wheel side absorption torque calculator 131, 191: Control current calculator, 132, 192, 15: Comparator 133,193: Adder, 14: Front wheel side ATR controller 16: ASR control current calculator, 17: ASR controller 18: Rear wheel swing torque meter 19: Rear wheel side absorption torque calculator 20: Rear wheel side ATR Controllers 23, 24: torque distributor 21: load torque setting unit 22, 25: front and rear wheel torque distribution ratio discriminator 27: drive current detector, 28: torque calculator 8 ': oscillating torque meter 11', 18 ': Shaft torque meter

Claims (3)

(57) [Claims] 1. A front wheel-side roller and a rear wheel-side roller rotatably supported on a machine base at the same interval as the front and rear wheel intervals of an automobile, and a first A coupled to a rotation shaft of one of the rollers.
TR (automatic torque control) torque absorbing drive and tachometer, the second ATR (automatic torque control) torque absorbing drive and ASR (automatic speed control) torque absorbing drive coupled to the rotating shaft of the other roller, Roller rotation axis / ASR
The torque detecting means for detecting the torque between the torque absorbing drives, the first and second ATR torque absorbing drives and the control devices of the ASR torque absorbing drive and the load torque values for the first and second ATR torque absorbing drives are set. Torque setting device,
And a torque distributor for distributing and inputting the load torque value set by the torque setting device to the control device of the first and second ATR torque absorption driving devices at a predetermined load torque distribution ratio. The output is connected to the control device of the first ATR torque absorption drive device, and the control device is connected to the first ATR torque absorption drive device so that the detection output of the torque detection means becomes zero according to the detected torque value. The tachometer is connected to input a detection output to a control device of the ASR torque absorption drive device, and the control device controls the ASR according to the detection output of the tachometer.
Chassis dynamometer for a four-wheel drive vehicle that controls the ASR torque absorption drive so that the roller on the torque absorption drive and the roller on the first ATR torque absorption drive rotate at the same speed. 2. A front wheel-side roller and a rear wheel-side roller which are rotatably supported on a machine base at the same interval as the front and rear wheel intervals of an automobile, and a first A coupled to a rotation shaft of one of the rollers.
TR (automatic torque control) torque absorbing drive and tachometer, the second ATR (automatic torque control) torque absorbing drive and ASR (automatic speed control) torque absorbing drive coupled to the rotating shaft of the other roller, Roller rotation axis / ASR
The torque detecting means for detecting the torque between the torque absorbing drives, the first and second ATR torque absorbing drives and the control devices of the ASR torque absorbing drive and the load torque values for the first and second ATR torque absorbing drives are set. Torque setting device,
A first torque distributor for distributing and inputting the load torque value set in the torque setting device to the control device of the first and second ATR torque absorption drive devices at a predetermined load torque distribution ratio, and a magnitude of the detected torque value of the torque detecting means; A torque discriminating device for discriminating the torque, and the detected torque value of the torque detecting means is distributed at a predetermined load torque distribution ratio by the discrimination of the torque discriminating device, and is distributed and input to the control devices of the first and second ATR torque absorption driving devices. A second torque distributor, wherein the torque detection means is connected so that a detection output is input to a control device of the first ATR torque absorption drive device, and the control device of the first ATR torque absorption drive device is configured to detect the detected torque. The control device of the second ATR torque absorption drive device, according to the value of the torque and the distribution torque value from the second distributor, Each of the ATR torque absorption driving devices is controlled so that the detection output becomes zero, and the tachometer is connected to input the detection output to a control device of the ASR torque absorption driving device. The roller on the ASR torque absorption drive side and the first
Chassis dynamometer for a four-wheel drive vehicle that controls the ASR torque absorption drive so that the rollers on the ATR torque absorption drive side rotate at the same speed 3. A front wheel-side roller and a rear wheel-side roller, which are rotatably supported in parallel with the machine base at the same interval as the front and rear wheels of an automobile, and a first A coupled to a rotating shaft of one of the rollers.
TR (automatic torque control) torque absorbing drive and tachometer, the second ATR (automatic torque control) torque absorbing drive and ASR (automatic speed control) torque absorbing drive coupled to the rotating shaft of the other roller, Roller rotation axis / ASR
The torque detecting means for detecting the torque between the torque absorbing drives, the first and second ATR torque absorbing drives and the control devices of the ASR torque absorbing drive and the load torque values for the first and second ATR torque absorbing drives are set. Torque setting device,
A first torque distributor for distributing and inputting the load torque value set in the torque setting device to the control device of the first and second ATR torque absorption driving devices at a predetermined load torque distribution ratio; and a detection torque value of the torque detection means. A second torque distributor for distributing and inputting to the control device of the first and second ATR torque absorption drive devices at a predetermined load torque distribution ratio, and controls the first ATR torque absorption drive device control device and the second ATR torque absorption drive device. The apparatus controls each ATR torque absorption drive so that the detection output of the torque detecting means becomes zero according to the distribution torque value from the second distributor, and the tachometer outputs the detection output to the ASR torque. It is connected to input to a control device of the absorption drive device, and the control device is connected to the roller on the ASR torque absorption drive device side and the first according to the detection output of the tachometer.
Chassis dynamometer for a four-wheel drive vehicle that controls the ASR torque absorption drive so that the rollers on the ATR torque absorption drive rotate at the same speed