JPH0776717B2 - Power train tester torque control method and control device thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a test apparatus for testing power train system components among automobile components.

[0002]

2. Description of the Related Art Generally, these test devices use an automobile engine or an electric motor as an alternative device thereof as a drive device, and a power train system for automobiles such as a transmission and a differential gear is coupled to the drive device and used as a load device on the tire side. An electric motor, an eddy current absorber, or the like is connected to and the test is performed by applying a rotation or torque according to the actual vehicle to the DUT.

Conventionally, a test apparatus of this type controls an absorption torque by using an electric motor or an eddy current type torque absorption machine as a load absorption machine. In this case, it was difficult to stably control and absorb the predetermined torque from the time of stopping to the low speed, so that there is a drawback that the test at the time of starting the vehicle, running at low speed and stopping cannot be sufficiently performed. It was

FIG. 2 is an overall configuration diagram showing a basic example of the prior art. Reference numeral 1 denotes an automobile engine, which is operated as a drive device by controlling the rotation of the engine 1 at a predetermined speed. In this type of test machine, an electric motor may be used instead of the engine 1. Reference numeral 2 is a device under test composed of a transmission and a differential gear. here,
There is also an example in which the load absorber is directly connected to the output shaft of the transmission except the differential gear. Torque detectors 3 and 4 are used as feedback signals for measuring wheel shaft torque and torque control. Reference numerals 5'and 6'denominate electric motors, which are DC electric motors or induction electric motors and are connected as wheel-side load absorbers for automobiles. Reference numerals 7'and 8'are electric motor control devices, which control the torque of the electric motor by inputting the torque command from the torque setting device 9'and the torque feedback signal.

[0005]

In such a structure, when the load machine cannot absorb the torque in the stopped state and the low speed state, or when the torque control is not smoothly performed from the low speed to the high speed, the actual vehicle is used. It has a drawback that the test at the time of starting cannot be performed accurately. Further, when the automatic transmission using the fluid clutch is started, it is necessary to apply a stable absorption torque from the stop to the high speed rotation, which cannot be realized by the conventional device.
Further, even when the vehicle is decelerated from a high speed to stop, there is a risk of reverse rotation if the absorption torque is controlled until the stop, which was not possible. In such a case, there is no choice but to take a method of detecting the low speed rotation before the stop and cutting off the electric current of the electric motor to stop it by free run or by a mechanical brake dedicated to stop, and stop from high speed. It was not possible to stop while continuously applying absorption torque until. The present invention was devised in view of the above-mentioned points, and an object thereof is that the disk brake mainly performs the absorption torque control with high accuracy in the low speed range from the stop,
The present invention provides a power train tester torque control device capable of realizing stable torque control in a wide range from stop to high speed, such that the electric motor mainly performs accurate absorption torque control in the low speed range to the high speed range.

[Means for Solving the Problems]

That is, the means for achieving the object is, in a power train tester as an automobile parts testing apparatus, when the speed is small with respect to the torque command of the entire DUT, the torque command of the electric motor is made small and the speed is "0"
When the speed is high, the torque command of the electric motor is set to "0", and when the speed is high, the tokdle command of the electric motor is gradually increased. When the speed is low, the torque command of the disc brake is increased and the disc brake is tested. It bears the torque of the whole body, and gradually reduces the torque command of the disc brake when the speed is high, and the torque command value of the electric motor and the disc brake of the torque command value of the electric motor and the disc brake is increased without a step from stop to low speed and high speed. This is a power train tester torque control method as a load device that is stable from stop to high speed by changing the sharing. Further, as the control device, the sharing of the torque control of the electric motor and the disc brake is reduced according to the magnitude of the speed, that is, the sharing of the electric motor is reduced and the sharing of the disc brake is increased in the low speed range from the stop. Therefore, in a high speed, the power train tester torque control device is provided with a function generator that gives a torque command value to the load device so that the electric motor shares all torque control and the disk brake torque control share becomes "0". is there.

[0007]

The command value of the load absorption torque is commanded by the torque setting device 27 in FIG. 1 described later. In the torque control devices 25 and 26 which receive this command and the feedback signal of the torque detector 3 or 4, the torque command of the torque control device for the electric motor and the disc brake is changed according to the magnitude of the speed. Function generators 17, 18, 19 and 20 are prepared so as to change the share of the control amount of the brake torque. Then, at the time of stop and low speed, as shown inside the function generators 18 and 19, its output as a function is the torque control device.
Multipliers 22 and 23 multiply the torque control amounts of the outputs of 25 and 26 to obtain a torque control command for the disc brake. Further, from low speed to high speed, as a function as shown in the function generators 17 and 20, the output thereof is multiplied by the torque control amount of the output of the torque control devices 25 and 26 to the multipliers 21 and 24 to generate a torque control command for the electric motor. And An embodiment of the present invention will be described in detail below with reference to the drawings.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an overall configuration diagram showing a basic embodiment of the present invention, in which 1 is an automobile engine (E / G) as a driving machine, and a transmission 2 is provided on this output shaft.
Disc brakes 5, 6 and an electric motor 7, coaxially with the output shaft of the DUT, which is composed of a differential gear and a wheel shaft.
8 are arranged. The disc brakes 5 and 6 are hydraulically driven, and the hydraulic pressure is controlled by the servo valves 13 and 14. These servo valves 13 and 14 are used to perform the torque control of the disk brakes 5 and 6 in the servo control devices 11 and 12 which receive the torque command and the torque field back signals obtained from the torque detectors 3 and 4, respectively. To be done.

The electric motors 7 and 8 have their currents controlled and their torques controlled by the outputs of the control devices 9 and 10 to which the torque command and the torque field back signal are input. A command for the absorption torque of the absorber as a whole is issued from the torque setting device 27. The torque control device 25 and 26, which receives the torque command value and the torque field back signal, has control output signals thereof, which are function generators 17, 18, 19, 20 which are generated by the speed detection signals of the speed detectors 15 and 16. Output of the multiplier
By multiplying by 21, 22, 23, 24, the torque control command for the electric motors 7, 8 and the disk brakes 5, 6 is obtained. In the function generators 18 and 19 shown in FIG. 1, X represents a speed signal and Y represents a torque command value. Therefore, the operation of the function generators 18 and 19 is such that the output becomes "1" when the speed X is small, becomes smaller as the speed increases, and approaches "0". This output Y is multiplied by the torque control command value by the multiplier 22 or 23 to form a torque control command for the disc brakes 5, 6. On the other hand, in the function generators 17 and 20 in FIG. 1, similarly, X represents the velocity signal,
Y represents a torque command value. Therefore, the output of the function generators 17 and 20 is "0" when the speed X is small.
Then, as the speed increases, it gradually increases and approaches "1". This output Y is multiplied by the torque control command value by the multiplication values 21 and 24 to form the torque command for the electric motors 9 and 10. Here, in the function generators 18 and 19 of the disc brakes 5 and 6 and the function generators 17 and 20 of the electric motors 9 and 10, the sum of the outputs of these function generators is set to "1" and the torque is set. Is distributed to the disc brakes 5 and 6 and the electric motors 9 and 10 in a balanced manner. Therefore, smooth switching is possible without generating an inflection point of the control system of the entire control device. Stable torque control is possible at high speeds (100 rpm or higher) of the electric motor, and stable torque control is difficult to obtain at low speeds (100 rpm or lower) as the speed approaches "0". Therefore, the torque control of the disc brake is shared at a low speed, and this switching is smoothly switched in proportion to the speed. In this way, the absorption torques of the disc brakes 5 and 6 and the electric motors 7 and 8 are controlled so that their magnitudes are shared according to the rotation speed.

[0010]

As described above, according to the present invention, the disk brake mainly performs the absorption torque control accurately in the low speed range from the stop, and the electric motor mainly absorbs the absorption torque in the low speed range to the high speed range. Torque control is performed with high accuracy, and each characteristic of the absorber, that is, the disc brake has a merit that the torque is controlled accurately with a low speed at a low speed and a small amount of heat generation. In addition, this device has the disadvantages that there is a risk of mechanical damage due to high heat generation at high speeds, the merit of efficient and highly accurate control at high speeds, and unstable torque control that tends to become unstable at low speeds. By improving the advantages and disadvantages of both of them, which have the danger of rotating at any speed, there is an advantage that stable torque control can be realized in a wide range from stop to high speed.

[0011]

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing a basic embodiment of the present invention.

FIG. 2 is an overall configuration diagram showing a basic example of the related art.

[0012]

[Explanation of symbols]

 1 Engine 2 DUT 3 Torque Detector 4 Torque Detector 5 Disc Brake 5'Electric Motor 6 Disc Brake 6'Electric Motor 7 Electric Motor 7 'Controller 8 Electric Motor 8' Controller 9 Controller 9 'Torque Setter 11 Servo Controller 12 Servo control device 13 Servo valve 14 Servo valve 15 Speed detector 16 Speed detector 17 Function generator 18 Function generator 19 Function generator 20 Function generator 21 Multiplier 22 Multiplier 23 Multiplier 24 Multiplier 25 Torque control device 26 Torque control device 27 Torque setting device

Claims (2)

[Claims] 1. A drive device by an engine or an electric motor, a transmission and a differential as a test object, an electric motor as a load device for the device, a disc brake connected coaxially with the electric motor, and a torque of these load devices. In a power train tester as an automobile parts testing device having a control device, the torque command of the electric motor is reduced when the speed is small with respect to the torque command of the entire DUT,
When the speed is near "0", the torque command of the electric motor is set to "0", when the speed is high, the tokdle command of the electric motor is gradually increased, and when the speed is low, the torque command of the disc brake is increased, When the speed is near "0", the disk brake bears the torque of the whole DUT, and when the speed is high, the torque command of the disk brake is gradually decreased, and steps from stop to low speed and high speed are performed. A power train tester torque control method, wherein the torque command value of the electric motor and the torque command value of the disc brake are changed without being provided, and a tokule as a load device that is stable from stop to high speed is controlled. 2. A drive device using an engine or an electric motor, a transmission and a differential as test objects, an electric motor as a load device for the device, a disc brake connected coaxially to the electric motor, and a torque for these load devices. In a power train tester as an automobile parts testing device having a control device, the sharing of torque control of the electric motor and the disc brake is determined according to the magnitude of the speed, that is, when the speed is low, the torque command of the electric motor is small, and the speed is small. When it is near "0", the torque command of the motor is set to "0",
Further, when the speed is high, the torque command of the electric motor is gradually increased, when the speed is low, the torque command of the disc brake is increased, and when the speed is near "0", the torque of the entire test object is increased by the disc brake. A power train tester torque control device comprising a function generator that gives a torque command value to the load device so as to gradually reduce the torque command of the disc brake when the load is increased and the speed is high.