JPH01121911A - Phase controller for rotating body - Google Patents

Abstract

PURPOSE:To perform detection and phase control of quick response by using the counted value of a counter, which takes one output of a pulse processing circuit of a pair of pulses proportional to rotation of a rotating body as the up-counting pulse and takes the other as the down-counting pulse, as a phase difference detection value. CONSTITUTION:An up/down pulse processing circuit 15 differentiates pulses from pulse pickups 1A and 1B to obtain an up/down command U/D, an up pulse, and a down pulse from both pulses. An up/down counter 16 is switched to up-counting or down-counting by the command U/D from the circuit 15 and is counted up by the up pulse at the time of counting-up and is counted down by the down pulse at the time of counting-down. A dead band circuit 17 uses the counted value of the counter 16 as phase difference detection data. An adding/subtracting circuit 18 performs addition/subtraction between phase difference detection data Y from the circuit 17 and a prescribed value X of a phase difference setter 19 to obtain the phase deviation, and this deviation is converted to an analog signal by a D/A converter 20 and is outputted. Thus, the phase difference free from delay is obtained as the counted value.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a phase control device for a plurality of rotating bodies, and more particularly to a phase difference detection circuit that detects a phase difference from speed pulses of the rotating bodies.

B0 Summary of the Invention The present invention provides a phase control device that detects and controls rotational phase differences between a plurality of rotating bodies, in which one of a pair of pulses proportional to the rotation of the rotating bodies is an addition counting pulse and the other is a subtraction counting pulse. By using the count value of the up/down counter as the phase difference detection value, it is possible to perform phase control with excellent responsiveness while using a relatively simple circuit.

C8 Conventional technology Four-wheel drive vehicle (4WD) powertrain test equipment uses independent front and rear benches that apply loads to the front and rear wheels independently, and four-wheel independent benches that apply loads independently to the left and right wheels of each front and rear wheels. A chassis bench is installed to enable various performance tests by adjusting the load status of each wheel (differential rotation, load sharing) to test conditions.

This load section is controlled by constant speed control, constant torque control, and running resistance control using a DC electric dynamometer, etc.
Differential rotation control, differential torque control 1 phase difference control, etc. of the left and right wheels or front and rear wheels of the test machine are performed.

FIG. 2 shows the main control circuit of the load control section. The rotational speed or amount of rotation of the front and rear wheels of the machine under test on the chassis bench is detected as the pulse frequency or number of pulses of the pulse pickups IA and IB.

The phase control section 2 detects the phase difference between the front wheels and the rear wheels from the pulses from the pulse pickups IA and IB, and obtains a phase control output according to the deviation between this phase difference and the phase difference set by the phase difference setting device 3. On the other hand, the pulse outputs of the pulse pickups IA and IB are converted into voltage signals by frequency-voltage converters 4A and 4B, and the differential rotation between the front wheels and the rear wheels is detected from the deviation between these two signals. The differential rotation control section 5 uses the output from the control section 2 as a minor loop of the phase control by the phase control section 2 as a differential rotation command, uses the differential rotation from the converters 4A and 4B as a feedback signal, and calculates the deviation of both signals by proportional integral calculation. Using this output as a torque command, torque control is performed based on the deviation between the torque set by the torque setter 7 or the torque detected by the torque detector 8 by the torque control amplifiers 6A and 6B for the front and rear wheels.

In such a control circuit, a conventional circuit configuration of the phase control section 2 is shown in FIG. The digital calculation section 11 counts the output pulses of the pulse pickups LA and IB in fixed time (sampling time) units to obtain the differential speed A-B between the numerical values of both hands, and the digital integration section 12 integrates the differential speed A-B. to obtain a phase difference detection signal, and use this and phase difference setting device 1.
The configuration is such that the deviation from the set value of No. 3 is amplified by the amplifier 14.

D1 Problems to be Solved by the Invention In the configuration of the conventional phase control section, there is a delay due to the speed difference calculation due to the sampling period of the digital calculation section 11;
There is also an integration delay caused by the digital integration section 12. This delay becomes a dead time of the phase control system, which poses a problem of limiting the response time of the control system. This poor responsiveness is due to
For example, this made it difficult to control transient phases during acceleration and deceleration during load tests.

An object of the present invention is to provide a phase control device with excellent responsiveness without complicating the circuit configuration.

Means and Effects for Solving Problem E1 In order to achieve the above-mentioned object, the present invention includes a plurality of pulse pickups each generating a pulse proportional to the rotational speed or amount of rotation of a plurality of rotating bodies, and a plurality of pulse pickups of the pulse pickup. an up/down counter circuit that uses one of the two pulses as an addition counting pulse and the other as a subtraction counting pulse, and uses the count value of this circuit as the rotational phase difference of the plurality of rotating bodies to generate a rotational phase detection signal of the plurality of rotating bodies. It is characterized by making it.

F. Embodiment FIG. 1 is a circuit diagram of a phase control section showing an embodiment of the present invention. The up/down pulse processing circuit 15 performs differential processing on the pulses from the pulse pickups IA and IB, respectively, to obtain a pulse at the rising or falling timing.
The up/down command U/D and the up pulse and down pulse are obtained from these two pulses. The up/down counter 16 receives up/down commands U/D from the processing circuit 15.
Addition and subtraction are switched by , and up pulses are counted and added during addition, and down pulses are counted and subtracted during subtraction. The dead band circuit 17 takes out the count value of the counter 16 as a dead band in the range of 0±1, and uses it as phase difference detection data. Addition/subtraction circuit 18 is dead band circuit 1
The phase difference detection data Y from 7 and the setting value X of the phase difference setter 19 are digitally added and subtracted to obtain a phase deviation, and this deviation is converted into an analog signal by a D/A converter 20 and output.

In such a configuration, the up/down counter 16 has a count value (a value corresponding to a phase difference) depending on the number of up pulses and down pulses input, and the count value changes in real time with respect to the pulse input. Therefore, it is possible to obtain a phase difference as a count value without delay due to sampling time and delay due to integration processing as in the conventional method.

Then, the count value of the counter 16 is converted into a dead band circuit 17.
A dead band is given to the phase difference of 0±1. As a result, in a synchronous state where pulses from the pulse pickup are input alternately, the count value of the counter 16 is within a dead band of 0±1, and the output of the circuit 17 is fixed at a constant value (+1 or -1). The addition and subtraction results in the adder/subtractor 18 and D
Unnecessary vibrations can be eliminated from the conversion output of the /A converter 20.

Note that the maximum count value of the counter 16 and the pulse frequencies of the pulse pickups IA and IB are appropriately determined based on the precision of phase control, for example, the pulse frequency of the pulse pickups IA and IB.

IB is 360. <Rus/1 rotation, the rotational phase accuracy is ±16.

In addition, although the example shows a case where the phase difference from two rotation detectors is detected, this can be applied to phase control of multiple rotating bodies, such as detecting phase differences from three or more detectors individually. Of course.

G1 Effects of the Invention As described above, according to the present invention, the count value of the up/down counter in which one of the output pulses of a pair of pulse pickups is an addition count pulse and the other is a subtraction count pulse is used as a phase difference detection value. Therefore, it is possible to perform high-speed response detection and phase control without the conventional sampling time and delay in integral calculation. Furthermore, the circuit configuration is simplified compared to conventional calculations.

[Brief explanation of the drawing]

FIG. 1 is a main part control circuit diagram showing one embodiment of the present invention, and FIG.
The figure is a main part control circuit diagram of a load control section of a power train testing device, and FIG. 3 is a circuit diagram of a conventional position control section. IA, IB... Pulse pickup, 2... Phase control unit, 15... Pulse processing circuit, 16... Up/down counter, 1.7... Dead band circuit, 18...
... Addition/subtraction section, 19... Phase difference setting device, 20... D
/A converter.

Claims (1)

[Claims] A plurality of pulse pickups each generating a pulse proportional to the rotational speed or amount of rotation of a plurality of rotating bodies, and an up/down counter circuit that uses one of the two pulses of the pulse pickup as an addition counting pulse and the other as a subtraction counting pulse. A phase control device for a rotating body, characterized in that the counted value of this circuit is used as a rotational phase detection signal of the plurality of rotating bodies as a rotational phase difference of the plurality of rotating bodies.