JPH03131738A - Monitoring device for electric car - Google Patents

Abstract

PURPOSE:To improve performance by moving a trigger condition and the constant of a sampling cycle from a ROM to a battery-backup write and readout enabled memory(B-RAM). CONSTITUTION:In the ROM 3, a control program is stored in an area A and the trigger condition and the constant of the sampling cycle are stored in an area B. The area A of a B-RAM 4 is for stacking and working and the area B thereof is for storing the constant. At the time of turning on the power source of a microcomputer, a CPU 1 retrieves the presence or absence the constant in the RAM 4. When the constant does not exist, the constant in the area B of the ROM 3 is moved to the area B of the RAM 4, then the constant is initialized on the B-RAM 4. Thus, the microcomputer successively writes information from an input device 2 on the RAM 14 according to the control program on the ROM 3 and the sampling cycle of the constant on the RAM 4. By completing the write of the input information and recording the information when the trigger condition of the constant on the RAM 4 holds, the monitoring performance is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a monitoring device for an electric vehicle, and particularly to a device for recording control states before and after a failure.

[Conventional technology]

In the conventional method, as described in Japanese Patent Application No. 60-248873, the trigger conditions and sampling period were predetermined and stored, for example, in a read-only memory (hereinafter abbreviated as ROM), so it is necessary to change them. It was very time consuming.

[Problem to be solved by the invention]

The above-mentioned conventional technology does not give consideration to a simple method of changing the trigger condition or the sampling period.

For example, if you want to change the trigger condition and record another type of failure information, you can use R with memory contents that match that.
There was a problem in that it was very time consuming to create a new OM and replace it with the old ROM each time.

An object of the present invention is to enable trigger conditions and sampling period constants to be set online without changing the ROM.

[Means to solve the problem]

The above purpose is to use a battery-backed read/write memory (hereinafter referred to as B-RA) by using a predetermined means to set the trigger conditions and sampling period constants stored in the ROM.
(abbreviated as M).

[Effect]

The trigger conditions and sampling period constants on the ROM can be directly changed by an external terminal via the transmitter/receiver circuit. Furthermore, since the constant is written on the B-RAM, it is not lost even when the power is turned on and off.

Since the microcomputer is operated by the control program in the ROM and the constants in the B-RAM, it is possible to easily obtain changed performance.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

FIG. 1 is a simplified hardware block diagram of a microcomputer (hereinafter abbreviated as microcomputer).

1 is a central processing unit (hereinafter abbreviated as CPU), 2 is an input device for control information and failure information (hereinafter abbreviated as input device), 3 is ROM, 4 is B-RAM, and 5 is an asynchronous transmitting/receiving circuit (hereinafter abbreviated as ACiA). ), 6 is an R5232C cable, and 7 is an external terminal.

In the ROM, a control program is stored in area A, and trigger conditions and sampling cycle constants are stored in area B. Further, in the B-RAM 4, area A is used for stacking and working, and area B is used for constants.

When the microcomputer is powered on, the CPU searches B-RAM to see if there is a constant, and if there is no constant, moves the constant in area B in ROM3 to area B in B-RAM4. By doing this, constants are initialized on the B-RAM. In this way, the microcomputer sequentially writes the information taken in from the input device 2 to B-RAM4 at the sampling period of the control program on the ROM and the constant on the B-RAM, and the trigger condition of the constant on the B-RAM is satisfied. At this point, writing of the input information is finished and the information is recorded.

FIG. 2 shows the data flow when changing the trigger conditions and sampling period constants.

By connecting external terminal 7 to ACiA5,
Constants in area B on B-RAM can be directly rewritten. Since the constants are set to use those on B-RAM, the changed constants will be used afterwards, so the control program on ROM and the one on B-RAM will be used.
- Information will be recorded using the changed trigger conditions and sampling period on the RAM.

Furthermore, since the B-RAM 4 has an internal power supply even when the power is turned on and off, data is not lost.

Therefore, the changed data will be retained, so even if the power is turned off, information will be recorded using the changed trigger conditions and sampling period.

FIG. 3 is a simplified software flowchart when the power is turned on, as described above.

〔Effect of the invention〕

According to the present invention, since the trigger conditions and sampling period constants can be changed without replacing the ROM, necessary information can be easily recorded depending on the type of failure, and the performance of the monitoring device is improved. There is.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a microcomputer showing an embodiment of the present invention, Fig. 2 is a block diagram showing data communication with the outside, and Fig. 3 is a block diagram showing data communication with the outside.
The figure is a simplified software flowchart. 1...Central processing unit, 3...Read-only memory, 4
・Writable and readable memory with battery backup, Figure 5

Claims (1)

[Scope of Claims] 1. A device for inputting control information and failure information of an electric vehicle, a central processing unit, and a readable/writeable memory with battery backup capable of reading and writing data based on the instructions thereof. , and the processing content of its central processing unit, by sequentially writing the information input at a certain sampling period into the battery-backed read/write memory, and stopping the writing of the information according to a predetermined trigger condition, A control program having a function of recording input information in the battery-backed writable/readable memory, memorized data consisting of constants determining trigger conditions and sampling periods, and a read-only memory dedicated for reading the memorized data; In an electric vehicle monitoring device comprising a transmitting/receiving circuit that transmits and receives memory data between a read/write memory with battery backup and an external terminal, and an external terminal thereof, the trigger stored in the read-only memory Conditions and sampling period constants are transferred to the battery-backed read/write memory in a predetermined procedure, and the constants can be directly rewritten by the external terminal via the transmitting/receiving circuit. Features of a monitor device for electric vehicles.