JPS58127501A - Monitoring device for chopper of vehicle - Google Patents

Abstract

PURPOSE:To enable to transfer data of different types only via a unidirectional communication from a gate controller to a monitoring unit by setting the fundamental computing period of the gate controller with that of the monitoring unit and synchronizing the data from the timing of the variation in a byte length. CONSTITUTION:A gate controller MPU 1 ordinarily transmits (n) pieces of data within one period TCH of the chopper of a chopper frequency generator OFP, and transmits (n+1) pieces of data at the timing TCHn. A monitoring unit MPU 2 has a data number-in-one-chopper period counter N1 and a counter N2 which counts the period of the chopper, discriminates whether it is N1=n or not by using as an interrupt signal a chopper frequency signal CHOF and discriminates whether the data in one chopper period is the ordinary (n) or the breaking (n+1). In this manner, the data can be transferred only in a unidirectional communication.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a monitor device for a vehicle, and particularly to a monitor device suitable for serial transmission.

Recently, microcomputers (hereinafter referred to as MPUs) have been used for gate control of vehicle choppers.However, from the point of view of functional division, microcomputers (hereinafter referred to as MPUs) have been used as monitor devices for such chopper devices, as shown in Figure 1. Microcomputer M for monitoring independently from the microcomputer MPUI
PU2 may be provided. In this case, monitor data is sent from the chopper main circuit CHP (for example, chopper current, voltage, etc.) and from the gate control unit MPUI (for example,
When using serial transmission as the input method from the gate control unit, a transfer request including the data type specification is issued from the monitor's surface side for different types of data. A half-duplex communication method is used in which designated data is sent from the gate control unit.

However, this method requires processing time for transfer requests in the gate control unit, which limits the operating time for original gate control, or limits the time allocated to transfer processing, which limits the number of transferred data. There were some inconveniences.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, and to provide only one-way communication from the gate control section to the monitor section.
The objective is to provide a method for transferring data of different data types.

Therefore, in the present invention, the gate control section and the monitor section have the same basic operation cycle, and the byte length of data transferred by unidirectional communication within the basic operation cycle is not the same, and the monitor section , a method is used in which data is synchronized using software based on the timing of change in byte length and the type of data is determined.

FIG. 2 shows an embodiment of the present invention. In the figure, OFF is the chopper frequency generation circuit, and this output is the gate control section M P
U 1 , monitor unit MPU2, and chopper main circuit C
It is given to HP. Now, CHO this frequency signal
As F, the timing is set as shown in Fig. 3. That is, the number of data sent from the gate control unit within one cycle of the chopper TCH is normally n, and at the timing of TCH, it is n+1. In contrast, the monitor section is equipped with a counter N2 that counts one chopper period, uses the chopper frequency signal CHOF as an interrupt signal, starts the program shown in Figure 4, and checks whether N1=n (data within one chopper period). is normal n or n+1 for delimiter). FIG. 5 shows the configuration of MPUI and MPU2 necessary for the present invention, which consists of microprocessors MPI, MP2,
An ordinary microcomputer having memories R, OMl, 2, R, AMI, 2, and serial transmission interfaces 8I01, 5IO2 may be used.

In this way, the value of N2 will not be determined for a very short time after startup until the timing of the first data is set (until the first n+1 pieces of data are transferred), but after that, the timing of the data will change. is established, the classification of the type of transfer data is Nl.

This is possible using N2, and it becomes possible to transfer data of different data types using only one-way communication from the gate control unit to the monitor unit.

In the timing diagram of one embodiment of the present invention shown in FIG. 3, it is assumed that the number of pieces of received data to be divided into chopper cycles (N2) is one more (n+1) than usual, but is transmitted at the timing of N2=m. As described above, in general, the number of data that repeats the same pattern during N2 cycles (0 to m) is sufficient, and N2 can be determined by software based on the number of transmitted data N1.

Further, although the frequency of the chopper is fixed, it may be variable, and furthermore, the chopper frequency generation circuit OFF may be realized within the gate control unit MPUI.

The monitor device only needs to perform sampling and reception at a rate that corresponds to the time constant of the object, so using the method described above, the control unit transmits high-speed data every chopper cycle, and transmits low-speed data to the chopper cycle division (N2 ),
Unidirectional communication from the gate control section to the monitor section is possible while performing data segmentation at the required speed.

As described above, according to the present invention, it is possible to obtain a vehicle chopper monitoring device that requires only one-way communication from the control section and that imposes less burden on the gate control microprocessor in operating time.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a conventional embodiment, FIG. 2 is a diagram showing an embodiment of the present invention, and FIGS. 3 to 5 are diagrams for explaining the present invention. OFF...Chopper frequency generation circuit, MPU1...
Gate control microprocessor, MPU2...Mo=
Microprocessor for P, CHP... Chopper main circuit, N1... Chopper internal data number counter, N2
...Chopper cycle counter, S-work 0...Series transmission interface.

Claims (1)

[Claims] 1. In a device that monitors a main device that operates at a basic cycle by serial transmission using a microprocessor, the calculation cycle of the data reception cycle of the monitor unit is made to match the basic cycle, and The method is characterized in that data having the same number of turns is serially transmitted from the main device to the monitor device during the basic period in a cycle whose unit is several times the basic period. Vehicle monitoring device. 2. In claim 1, the high-speed data to be monitored is received every time during the basic cycle, and the low-speed data is
A monitoring device for a vehicle chopper, characterized in that it receives data in cycles whose unit is an integral multiple of the basic cycle.