JPS5926886B2 - Error detection method in mobile body position detection device - Google Patents

Description

[Detailed Description of the Invention] The present invention is a device for detecting the position of a running lane or a train, particularly an absolute position detecting device that detects an absolute position as a street address, by determining whether or not the detected street address is correct. The present invention relates to an error detection method in a mobile body position detection device.

Usually, in an absolute position detection device, the absolute position is an address represented by a binary code, and conventionally, in that code, extra bits are added to make the number of ``1'' or o'' into an odd or even number. was added to detect the presence or absence of errors in this binary code. Therefore, if an error occurs in an even number of bits of the code, it cannot be detected as an error. Furthermore, since position detection is performed over a long distance, it is not economical to add extra bits, that is, parity bits. In order to eliminate the above-mentioned drawbacks, this invention makes it possible to determine errors in position detection without adding parity bits.

To explain the principle, it is easy to predict changes in address due to the movement of a mobile object in position detection, so there is a certain correlation between the current address and the previously obtained address. By determining whether or not the position detection is correct, it is possible to determine whether or not the position detection is correct. Correlations include the right address, the left address, and the same address (stop), and if the address is any other than these, it will be an error. The present invention will be explained below with reference to the drawings. The drawing is a schematic diagram showing an embodiment of the present invention.

In this figure, 1 is a code plate that forms an absolute address installed along the moving path, 2 is a detector that moves together with the moving body and reads the code on code plate 1, and 3 and 4 are on the right side, respectively. For example, when the absolute address obtained by moving to the right or left is a BCD code of simple increase or decrease in the right-hand address generator and the left-hand address generator that determine the address and the left-hand address with a certain correlation, These are an adder that adds "1" and a subtracter that subtracts "1". 5, 6,
7 are the detector 2, right side address generator 3, and left side address generator 3, respectively.
A register that stores the output of 4, the same address, right address,
The address on the left side will be memorized.

8, 9, and 1 are exclusive OR circuits that compare the outputs of the registers 5, 6, and 7 with the output of the detector 2, and output "1" when both inputs match. If they do not match, "0" is output.

11 is an OR circuit that receives the outputs of the exclusive OR circuits 8, 9, and 10; 12 is a flip-flop that receives the output of the OR circuit 11; and 13 is a clock generator that generates two-phase clocks. , 14 is an AND circuit, 15 is a circuit portion that generates and stores an address adjacent to the previous address, 16
is a circuit portion that compares the detected code and the stored code.

Next, the operation will be explained. The code read by the detector 2 is sent to the register 5 by exclusive OR circuits 8, 9, and 10.
, 6, and 7, and if they are the same at the previous address, the output of the exclusive OR circuit 8 is ``1''. ``1'' and if the address matches the address to the left of the previous address, the output of the exclusive OR circuit 10 becomes ``1'', and these outputs are connected to the input of the flip-flop 12 through the OR circuit 11. The flip-flop 12 operates in synchronization with the clock of the clock generator 13, and monitors the state of the OR circuit 11 and outputs it. If they match, the output Q of the flip-flop 12 becomes 11°, and if they do not match, the output Q becomes “1”. That is, when the output Q is "1", it is a correct code, and when the output Q is "1", it is an incorrect code. When the sign is correct, the output of the AND circuit 14 becomes "1", operating the circuit section 15, and registers 5,
Rewrite the contents of 6 and 7. Therefore, the output of register 5 will always output the correct current address. However, in order for the above operation to be performed accurately, the positions of the code plate 1 and the detector 2, and the registers 5 and 6 must be adjusted in the initial state.
, 7 must match, and the period of the clock generator 13 must be sufficiently short compared to the moving speed.

As explained above, the present invention generates an absolute address adjacent to the current absolute address and stores it as a predicted address.
When a mobile object moves and a new absolute address is obtained, this absolute address is compared with the expected address and if they do not match, it is determined as an error.The series of binary codes as the absolute address itself has a redundancy Since the error in position detection is detected by utilizing the high value, erroneous detection can be performed without particularly adding redundant bits. Therefore, compared to the conventional method, the economic burden required for the code plates installed along the path can be reduced. Further, there are advantages such as the ability to further increase the reliability of position detection when used in combination with conventional methods.

[Brief explanation of the drawing]

The drawing is a block diagram showing the configuration of an embodiment of the present invention. In the figure, 1 is a code plate, 2 is a detector, 3 is a right-hand address generator,
4 is the left address generator, 5, 6, 7 are registers, 8, 9,
10 is an exclusive OR circuit, 11 is an OR circuit, 12 is a flip-flop, 13 is a clock generator, and 14 is an AND circuit.

Claims (1)

[Claims] 1. Divide the path that requires detection of the position of a moving object into certain sections, give each section an absolute address in binary code, and read the binary code at the moving object to determine its position. In the mobile position detection device that detects, an absolute address adjacent to the current absolute address is generated and stored as a predicted address, and when the moving object moves and becomes a new absolute address, this absolute address is compared with the predicted address. An error detection method in a mobile body position detecting device, characterized in that an error is determined when the values do not match.