JPS5990198A - Position measuring apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a position measuring device that detects the position of an object to be measured using a combination of a plurality of bit information.

In recent years, many types of position control devices are using digital control methods. Generally, in a device that performs digital control, it is desirable that the position detection stage output the position digitally. However, if, for example, part of the n bits of bit information becomes defective due to a malfunction in the position detection means or a malfunction in the bit information means, the probability of errors in position detection becomes extremely high. This tended to have a significant negative impact on position control.

Conventional devices have had the disadvantage of increasing the frequency of such failures due to the large number of information exchange points, so a highly reliable position measuring device has been desired.

The present invention was made in order to eliminate the two drawbacks of the conventional method, and when FP occurs in position measurement, it is reliably detected, prevents incorrect position control, and promptly implements correct control. The purpose of the present invention is to provide a position measuring device that can be returned to the original state.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, in which:
1 is a vehicle body, 2 is a wheel, 3 is a strut, 4 is a position detection device 0.5 having its ends fixed to the strut 3 and the vehicle body 1
A pneumatic actuator is provided between the vehicle body 1 and the wheels 2, and is configured to make the relative distance between the vehicle body 1 and the wheels 2 variable in accordance with pneumatic control. Reference numeral 6 denotes an arithmetic unit for controlling and maintaining the vehicle height constant, and outputs an output from the position detecting device 4. Reference numeral 7 denotes an air valve that supplies the air pipe pressurized by a compressor (not shown) to the pneumatic actuator 5, and is configured to respond to the SUP output. Reference numeral 8 denotes an air supply valve that supplies the air to the pneumatic actuator 5, and is configured to respond to the EXH output.

Based on the above configuration, the operation of one embodiment of the present invention will be described. Now, when the vehicle height changes in the direction of lowering depending on the number of passengers or the amount of loaded baggage, when this is detected by the position detection device 4, the calculation device 6 generates a SUP output and the air supply valve 7 is opened. Pressurized air is supplied to the pneumatic actuator 5, which pushes down the strut 3, so that the vehicle body 1 becomes higher relative to the wheels 2. Next, when the vehicle height changes to the higher side, the arithmetic unit 6 generates an E As a result, the struts 3 rise, so that the vehicle body 1 becomes lower with respect to the wheels 2. Since the vehicle height is controlled in this manner, the vehicle body 1 can always maintain a constant height with respect to the wheels 2.

Next, the configuration of the arithmetic device 6 according to an embodiment of the present invention will be explained in a second embodiment.
This will be explained according to the diagram.

Figure 2 iJ: This shows a specific example of the configuration of the arithmetic unit in Figure 1. In the figure, 6-1 is a register that receives the output of the position detection device 4, and in this embodiment, the position Position bit pattern (hereinafter referred to as pit no e turn)
It is represented by 3 bits a, b, and c. Reference numeral 6-2 is an air supply/exhaust logic section which receives the output of the register 6-1 and maintains the vehicle height constant, and generates a SUP output or an E, XH output depending on the current vehicle height. Reference numeral 6-3 denotes a pattern generator, which is composed of a ROM or the like, stores bit patterns a, b, and c in an order corresponding to changes in position in advance, and receives the output from the register 6-1. When the vehicle height changes next time, the bit numbers (turns a, b, c) that are expected to be output from the register 6-1 are retrieved and output.

6-4 is a register that holds a position bit pattern corresponding to a case where the vehicle height changes to a higher side among bit patterns a, b, and c outputted by the pattern generating section 6-3;
-5 is a register that holds a bit pattern corresponding to when the vehicle height changes to the lower side. Reference numeral 6-6 is a comparison section which receives the outputs of the registers 6-1, 6-4, and 6-5, and when a change occurs in the output bit turn of the register 6-1, Compare the pit nozzles and turns of the above with the output pit nozzles and turns of the register 6-4.6-6, and when they match, the control of the air supply and exhaust logic section 6-2 is enabled, or when they do not match any of them. , and is configured to generate an output for inhibiting the control.

The operation of one embodiment of the present invention will be described with reference to FIG. 3 based on the configuration of the arithmetic unit described below.

FIG. 3 is an explanatory diagram showing an example of a bit turn generated by the position detecting device of FIG. 1, and FIG. A, b, and c are expressed in correspondence to quantized positions O to 7. When generating such an unusual bit pattern, if a defect occurs in bit C and a logic 1 is set, then a, b.

The position read from the bit pattern of C is shown in Figure 3 (
b), and the order #C is 1 to 3.3 to 5
．． Jumping from 5 to 7. By the way, when the bit pattern at position 3, that is, a, b, c=o, 1.1, is given to the register 6-1 in FIG. 2, the pattern generator 6-3 corresponds to position 4. bit tsuk turn a
, b, c': 1,0° bit turn a corresponding to the 0 and 2 positions.

b, c=0, l, and O are generated, and the respective bits/arm turns are held in registers 6-4 and 6-5. Now, when the vehicle height changes in the higher direction, the bit pattern a, b, c=1°0.1 corresponding to position 5 is generated in the register 6-1, so it is held in the registers 6-4 and 6-5. bit pattern 1
, 0, 0.0, 1.0. This mismatch is detected by the comparison section 6-6, and as a result, a control prohibition signal is output to the air supply/exhaust logic section 6-2. Even when the vehicle height changes from position 3 to a lower direction, the comparison section 6-6 outputs a control prohibition signal as described above.

Next, in Fig. 3(e), a defect occurs in pin (b) and the logic becomes 1.
, and the position shows a jump from 3 to 6. In addition, FIG. 3(d) shows a case where a defect occurs in pin a and the logic 1 is set, and the position jumps from 7 to 4. Therefore, in the case of Fig. 3(c), also in the case of Fig. 3(c),
It is clear that in case d), the control prohibition signal is outputted from the comparison section 6-6 by the same operation as in the case of FIG. 3(b) described above.

As explained above, according to the present invention, the output is generated by predicting the bit pattern output after the output of the position detecting device provided in the position measuring device changes, and this and the bit pattern output of the position detecting device are combined. )1; By the configuration to be compared,
A great practical effect is obtained in that erroneous position signals due to failure or malfunction can be easily detected and removed. Further, the configuration of the arithmetic circuit according to the present invention can be easily realized by applying a microprocessor, and thereby the configuration of the arithmetic circuit according to the present invention can be easily realized without making the manufacturing and installation of the system unnecessarily complicated and large-scale as in the case of conventional devices. It is particularly suitable for application to devices that require a high degree of reliability and mountability, such as vehicle height control devices for automobiles.

[Brief explanation of the drawing]

Figure 781 is a block diagram showing an embodiment of the application of the position measuring device according to the present invention to an automobile vehicle height control device;
1 is a circuit configuration diagram of the arithmetic device shown in FIG. 1, and FIG. 3 is a pattern explanatory diagram showing an example of a position bit pattern generated by the position detection device shown in FIG. 1. 1...Vehicle body, 2...Wheel, 3...Strut, 4
...Position detection device, 5...Pneumatic actuator, 6
...Arithmetic device, 7,8...Valve, 6-1, 6-
4, 6-5...Register, 6-2...Intake/exhaust logic section, 6-3...Pattern generation section, 6-6...Comparison section. In addition, in the drawings, the same reference numerals indicate the same or equivalent parts. Agent Makoto Kuzuno - 3rd (C) (C) (b) (CIl

Claims (1)

[Claims] (1) An optical, magnetic, electrical, or acoustic position detection device that converts the position of the object to be measured into a combination pattern of multiple bits of information and outputs it, and a A pattern generating means that generates a position bit pattern predicted to be outputted next by the position detecting device compares the pit and turn outputs of the position detecting device and the pickup generating means and generates a match or mismatch output. A position measuring device characterized in that it is configured with a comparator.