JPH0258841B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a monitoring device for a vehicle chopper,
In particular, the present invention relates to a monitor device suitable for serial transmission.

Microcomputers (hereinafter abbreviated as MPUs) have recently been used for gate control of vehicle choppers, but from the point of view of functional division, microcomputers (hereinafter referred to as MPUs) have been used for gate control as shown in Figure 1. A monitoring microcomputer MPU2 may be provided independently of the microcomputer MPU1. In this case, monitor data is input from the chopper main circuit CHP (for example, analog data such as chopper current and voltage) and from the gate control unit MPU1 (for example, conduction rate command value, etc.). Now, when using serial transmission as the input method from the gate control unit, the monitor device issues a transfer request that includes the data type specification for different types of data, and the specified data is then sent from the gate control unit. Half-duplex communication methods are in use.

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 was an inconvenience.

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

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. A method is used in which data is synchronized using software based on the timing of change in length and the type of data is determined.

FIG. 2 shows an embodiment of the present invention. OFP in diagram
is a chopper frequency generating circuit whose output is given to the gate control section MPU1, the monitor section MPU2, and the chopper main circuit CHP. Now, using this frequency signal as CHOF, set the timing as shown in Figure 3. In other words, in the gate control section, data is normally transmitted within one period TCH of the chopper.
n+1 pieces of data are sent at the timing of TCH _o . Furthermore, to explain using Fig. 3, the data string sent from the gate control section is created according to the rules stored in advance in ROM1 (Fig. 5) (the nth data of TCHm-1 is This created data string is sent to the monitor section using the chopper frequency signal as an interrupt signal. On the other hand, in the monitor section, 1
A counter N1 for the number of data within a chopper period and a counter N2 for counting the chopper period are provided, and the chopper frequency signal CHOF is activated according to the interrupt signal to start the program shown in FIG. is a normal n or a delimiter n+1). Figure 5 shows the configuration of MPU1 and MPU2 necessary for the present invention, which consists of microprocessors MP1, MP2, memory ROM
An ordinary microcomputer having RAM1, 2, and serial transmission interfaces SIO1, SIO2 may be used.

In this way, until the timing of the first data after startup is obtained (the gate control section creates a data string independently of the monitor section, n+1 data will be transferred for the first time after the monitor section starts counting). The value of N2 is not determined for a very short period of time (until the time of arrival), but after that the data timing is established, so the type of transfer data is classified as N1,
This is possible using N2. Referring to Figure 3,
The transferred data strings are N1 and N2, respectively.
The data has a meaning given by the rules stored in the ROM 2 (FIG. 5), and the type is determined by referring to the location of the data. This results in
Transfer of data of different data types is possible with 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, the number of received data for dividing the chopper period (N2) is one more (n+1) than usual;
The explanation was given assuming that it is transmitted at a timing of N2 = m, but generally, between N2 cycles (0 to m),
The number of data that repeats the same pattern is sufficient, and N2 can be determined by software based on the number of transmitted data N1.

In addition, although the frequency of the chopper is fixed, it may be variable, and the chipper frequency generator OFP
may be realized within the gate control unit MPU1.

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 gate control section transmits high-speed data every chipper period, and transmits low-speed data to the division of the chopper period ( N2) enables unidirectional communication from the gate control section to the monitor section at the required speed and while performing data classification.

As described above, according to the present invention, it is possible to obtain a monitor device for a vehicle chopper that requires only one-way communication from the control section and that imposes less burden on the gate control microprocessor in terms of 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. OFP……Chopper frequency generation circuit, MPU1…
...Gate control microprocessor, MPU2...
...Monitoring microprocessor, CHP...Chiyotsupa main circuit, N1...Chiyotsupa period data number counter, N2...Chiyotsupa period counter, SIO...
…Serial transmission interface.

Claims (1)

[Claims] 1. A chopper for a vehicle equipped with a monitor device that takes in data from a gate control device that operates a chopper main circuit and monitors the gate control device, a chopper frequency generating circuit that provides a frequency signal to the chopper main circuit, and the gate control device. With a period m times the period of the frequency signal as one unit, n+1 data in the m-th period among the m periods of the frequency signal in this one unit, and n data in the other periods. a first counter for counting the number of data transmitted in each period of the frequency signal to the monitoring device;
a second counter for counting the number of periods of the frequency signal; means for resetting the second counter when the count number of the first counter is n+1; A vehicle characterized by comprising means for determining the position of data sent in each cycle and determining the type of each data, and transmitting data in unidirectional series from the gate control device to the monitor device. Chiyotsupa for.