CN102156237B - Method for detecting automotive harnesses - Google Patents

Method for detecting automotive harnesses Download PDF

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Publication number
CN102156237B
CN102156237B CN201110054179.5A CN201110054179A CN102156237B CN 102156237 B CN102156237 B CN 102156237B CN 201110054179 A CN201110054179 A CN 201110054179A CN 102156237 B CN102156237 B CN 102156237B
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wire harness
matrix
terminal
standard
measured
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CN201110054179.5A
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Chinese (zh)
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CN102156237A (en
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盛碧琦
潘天红
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江苏大学
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Abstract

The invention discloses a method and a device for detecting automotive harnesses. The method comprises the following steps that: a micro-computer is connected with a power circuit, an address decoding circuit, m control output ports and n control input ports respectively; the micro-computer groups standard harnesses and to-be-detected harnesses respectively according to conductivity; the micro-computer selects one harness from an input terminals of the standard harnesses and the to-be-detected harnesses sequentially; the micro-computer applies a low-level signal to one of the standard harnesses and the to-be-detected harnesses through the m control output ports and then applies a high-level signal to the other standard harnesses and the other to-be-detected harnesses; the micro-computer reads and stores response matrixes of the standard harnesses and the to-be-detected harnesses; the micro-computer carries out dimension-reduction operation on the stored two response matrixes and carries out dimension reduction on maximum detection capacity into real detection capacity; and the micro-computer compares elements at same positions of the two dimension-reduced response matrixes by logic operation to obtain a fault judgement matrix at last. In the invention, manual operation is replaced by automatic operation of the micro-computer, so that detection efficiency is high, and error detection or missed detection is difficult to occur.

Description

A kind of automotive wire bundle detection method

Technical field

The present invention relates to a kind of automotive wire bundle and detect, belong to automotive electronics detection technique field.

Background technology

Automotive wire bundle refers to after the contact element terminal (connector) that formed by copper material punching and electric wire crimping, outside plastic compression insulator or added metal housing etc. again, with wire harness, tie up, connect connector, form the assembly of connecting circuit, it is the network principal of automobile circuit.Along with the raising of people to the security of automobile, comfortableness, economy and emission performance requirement, electrical arrangement on automobile, function are also more and more, reliability requirement to automotive wire bundle is more and more higher, this just requires automotive wire bundle to carry out in process of production strict detection and a large amount of tests, to guarantee the total quality of automobile.The means of traditional Site Detection wire harness conducting are to adopt multimeter, hummer or pilot lamp, pointwise overlaps by hand, by observing whether electricity, sound or light signal, judge the break-make of every connecting line, to wrong investigation check, also can only investigate by root circuit, not only speed is slow, efficiency is low, and easily causes the false retrieval of wire harness and undetected.

< < Chinese journal of scientific instrument > > 2005, No.2, a kind of automotive wire bundle detection method introduced in " design of wire harness automatic tester " literary composition of the upper publication of P99-103, select successively a terminal to apply certain voltage, read to remain the level of terminal, after the complete terminal of every scanning, contrast with standard loop table immediately, and misregistration information, scanned after all terminals, then carried out wire harness localization of fault.The method need to cause detecting data volume huge to all terminal point by point scanning, and the time of fault location algorithm is long, and detection efficiency is low; And because each terminal should, as input terminal, again as lead-out terminal, increase the complicacy of hardware design.

Summary of the invention

The object of the invention is provides a kind of automotive wire bundle detection method that can improve automotive wire bundle fault detect efficiency, reduce testing cost for overcoming above-mentioned the deficiencies in the prior art.

The technical scheme of automotive wire bundle detection method of the present invention comprises the steps: to adopt automotive wire bundle pick-up unit, this automotive wire bundle pick-up unit comprises microcomputer, microcomputer is connected with respectively power circuit, address decoding circuitry, m control delivery outlet and n control inputs mouth, and the output of address decoding circuitry connects respectively n control inputs mouth and m control delivery outlet; Control delivery outlet and n the equal control criterion logical signal of control inputs mouth, comprise the steps: for m

(1) respectively standard wire harness and wire harness to be measured are divided into groups by conduction, every group has a input terminal and b lead-out terminal, and m control delivery outlet of a of standard wire harness input terminal connection, a b lead-out terminal are connected to a n control inputs mouth and start to detect; Actual measurement capacity a * b is less than maximum measurement capacity m * n;

(2) from a input terminal of standard wire harness, choose successively the terminal of a wire harness, microcomputer is controlled delivery outlet by m and is applied low level signal to this standard wire harness, all the other standard wire harness apply high level signal, read simultaneously and store the standard wire harness response matrix Rs level signal being produced by b lead-out terminal response of n control inputs mouth input; Repeat so successively until a standard wire harness detects end;

(3) from a input terminal of wire harness to be measured, choose successively a wire harness, microcomputer is controlled delivery outlet by m and is applied low level signal to this wire harness to be measured, all the other wire harness to be measured apply high level signal, read simultaneously and store the wire harness response matrix Rc level signal to be measured being produced by b lead-out terminal response of n control inputs mouth input; Repeat so successively until a wire harness to be measured detects end;

(4) microcomputer carries out dimensionality reduction computing to two described response matrix Rs of storage and Rc, by maximum measurement capacity m * n dimensionality reduction, is actual measurement capacity a * b, obtains standard wire harness response matrix after dimensionality reduction computing with wire harness response matrix to be measured , matrix , matrix ; Matrix peach row and matrix qeach row all only have an element 1, all the other elements are 0, by following steps, determine matrix pwith qelement:

Step 1, arranges matrix pfor null matrix;

Step 2, by following formula, find the line number that contains 0 element in standard wire harness response matrix Rs:

for standard wire harness response matrix r s element, for matrix line number, for rectangular array number, for standard wire harness response matrix Rs contain 0 element line number, it is standard Wiring harness terminal number;

Step 3, arranges null matrix by following formula p= in be 1 element:

, for standard wire harness response matrix r s the line number that contains 0 element, it is standard Wiring harness terminal number;

Step 4, arranges matrix qelement:

for standard wire harness response matrix r s element, for rectangular array number, for matrix line number, for standard wire harness response matrix r s the row number that contain 0 element, jit is Wiring harness terminal number; for matrix qelement;

(5) microcomputer compares the standard wire harness response matrix after dimensionality reduction by logical operation with wire harness response matrix to be measured the element of same position, obtains fault judgment matrix , for the XOR of matrix element, if r e = , wire harness non-fault to be measured, otherwise have fault.

The beneficial effect that the present invention has is:

1, with microcomputer automatic operation, replace manual operations, detection efficiency is high, is difficult for occurring false retrieval or the problem such as undetected.

2, by microcomputer, carry out the computing of matrix dimensionality reduction, greatly reduce the processing time, improved detection efficiency.

3, the interface that control interface is standard, is convenient to it to carry out secondary development, thereby can promotes the use of.

Accompanying drawing explanation

Below in conjunction with the drawings and specific embodiments, further describe the present invention:

Fig. 1 is structure and the principle of work schematic diagram of automotive wire bundle pick-up unit of the present invention;

Fig. 2 is the process flow diagram of automotive wire bundle detection method of the present invention;

In figure: 102. power circuits; 104. display; 106. microcomputers (MCU); Control delivery outlet for 108.m; 110. address decoding circuitry; 112. automotive wire bundle; 114.n control inputs mouth; 116. keyboard; Each detecting step of 202-222..

Embodiment

Shown in accompanying drawing 1, the output of an automotive wire bundle pick-up unit provided by the present invention, input end connect respectively input, the lead-out terminal of automotive wire bundle 112, and this automotive wire bundle pick-up unit comprises: microcomputer (MCU) 106, power circuit 102, address decoding circuitry 110, expansion m controls delivery outlet 108, n control inputs mouth 114 expanding and for keyboard 116 and the display 104 of man-machine interaction.Microcomputer 106 connects respectively power circuit 102, address decoding circuitry 110, a m control delivery outlet 108, a n control inputs mouth 114, keyboard 116 and display 104.Keyboard 116 and display 104 are respectively serially connected between power circuit 102 and microcomputer 106.The output of address decoding circuitry 110 connects respectively n control inputs mouth 114 and m control delivery outlet 108.The output of power circuit 102 is connected with respectively n control inputs mouth 114, m controls delivery outlet 108, keyboard 116, display 104 and microcomputer 106, so that power supply to be provided.The lead-out terminal of automotive wire bundle 112 connects microcomputer 106 by n control inputs mouth 114, and the input terminal of automotive wire bundle 112 is controlled delivery outlet 108 by m and connected microcomputer 106.

M control delivery outlet 108, a n control inputs mouth 114 are all designed to control criterion logical signal (Transistor-Transistor Logic level).

By n control inputs mouth 114 and m, control maximum measurement capacity m * n that delivery outlet 108 has been determined automotive wire bundle 112.

Referring to Fig. 2, while adopting the pick-up unit detection automotive wire bundle of Fig. 1, first Wiring harness terminal is divided into groups by connectedness, all terminals in one group are all communicated with, in every group, get a terminal as the input of wire harness, all the other terminals in this group, as the output of wire harness, are so just divided into all terminals of wire harness the large class of input and output two.After as stated above terminal being classified, standard wire harness is chosen to a terminal successively and apply low level, all the other apply high level, and read the response of lead-out terminal, record this response matrix, and wire harness test process to be measured is so analogized.Then by microcomputer 106 by after the response matrix dimensionality reduction of record, logic wire harness response matrix more to be measured and standard wire harness response matrix, finally carry out by keyboard 116 and display 104, sending testing result after the analysis of abort situation and type.Concrete detection method is as follows:

Step 202: did before this test and prepare, standard wire harness and wire harness to be measured are divided into groups by conduction.Standard wire harness, by conduction grouping, is all divided the terminal of the intrafascicular all connections of standard lines in same group, and every group has a input terminal and b lead-out terminal.The method of wire harness to be measured grouping is the same with standard wire harness, and every group of wire harness to be measured also has a input terminal and b lead-out terminal.After grouping finishes, by the automotive wire bundle pick-up unit of standard wire harness access Fig. 1, make a input terminal of standard wire harness connect m n the control inputs mouth 114 of b lead-out terminal connection of controlling delivery outlet 108, standard wire harness.The maximum measurement capacity that actual measurement capacity a * b is less than in Fig. 1 device is m * n.

Step 204: detect and start.

Step 206: intrafascicular at standard lines, from a input terminal, choose successively the terminal of a wire harness, microcomputer 106 is controlled delivery outlet 108 by m and is applied low level signal (TTL) to this wire harness, all the other wire harness apply high level signal, microcomputer 106 reads the level signal of n control inputs mouth 114 simultaneously, this level signal is to be produced by b lead-out terminal response, is the response signal of standard wire harness.

Step 208: microcomputer 106 is by the standard wire harness response matrix Rs storage of b lead-out terminal of standard wire harness;

Step 210: repeating step 206 and step 208 are until a standard wire harness detects end successively, and microcomputer 106 judges whether a standard wire harness detects end, if detect and finish, repeating step 206 and step 208, otherwise carry out next step 212;

Step 212: in wire harness to be measured, from a input terminal, choose successively a wire harness, microcomputer 106 is controlled delivery outlet 108 from m and is applied low level signal (TTL) to this wire harness to be measured, all the other wire harness apply high level signal, microcomputer 106 reads the level signal of n control inputs mouth 114 simultaneously, and this level signal is to be produced by b lead-out terminal response;

Step 214: microcomputer 106 is by the wire harness response matrix Rc storage to be measured of a wire harness b lead-out terminal to be measured;

Step 216: judge whether wire harness to be measured detects end, if detect finished, repeating step 212 and step 214 successively, otherwise carry out next step 218;

Step 218: the standard wire harness response matrix Rs of 106 pairs of storages of microcomputer and wire harness response matrix Rc to be measured carry out dimensionality reduction computing, dimensionality reduction computing is by the embedded dimensionality reduction matrix of microcomputer 106, utilizes matrix multiple principle, by maximum measurement capacity m * n depression of order of Fig. 1 device, be actual measurement capacity a * b, i.e. a of an actual wire harness to be measured input terminal and b lead-out terminal.Dimensionality reduction computing obtains the standard wire harness response matrix after dimensionality reduction with wire harness response matrix to be measured :

, wherein, matrix p=( p i,j ) ∈ r a * m, matrix matrix q=( q i,j ) ∈ r n * b;

For guaranteeing that the value of effective element does not change after dimensionality reduction computing, matrix peach row and matrix qeach row all only have an element 1, all the other elements are 0, by following steps, determine matrix pwith qelement:

Step 1, arranges matrix pfor null matrix, that is: p= ;

Step 2, finds standard wire harness response matrix by following formula r s in contain 0 element line number:

In formula, for standard wire harness response matrix r s element, for matrix line number, for rectangular array number, for standard wire harness response matrix r s the line number that contains 0 element, it is standard Wiring harness terminal number.

Step 3, arranges null matrix by following formula p= in be 1 element, that is:

In formula, for standard wire harness response matrix r s the line number that contains 0 element, it is standard Wiring harness terminal number.

Step 4, arranges matrix qelement, that is:

In formula, for standard wire harness response matrix r s element, for rectangular array number, for matrix line number, for standard wire harness response matrix r s the row number that contain 0 element, it is Wiring harness terminal number; for matrix qelement.

Step 5, utilizes matrix pwith qtreat survey line bundle response matrix r c carry out dimensionality reduction:

Step 220: logic comparison, microcomputer 106 carries out logical operation, compares the standard wire harness response matrix after dimensionality reduction with wire harness response matrix to be measured .The logical operation of microcomputer 106 is to utilize its embedded XOR program, and relatively the standard wire harness response matrix Rs after dimensionality reduction and the element of wire harness response matrix Rc same position to be measured, provide fault type again by result relatively.Standard wire harness response matrix after dimensionality reduction of the present invention with wire harness response matrix to be measured through logic, obtain fault judgment matrix after relatively r e :

Wherein, for the XOR of matrix element, if r e = , represent wire harness non-fault to be measured; Otherwise represent that wire harness to be measured has fault, now with in each row neutral element number sum be:

?;

Wherein, , obtain discriminant vector with can carry out fault analysis.The fault type of wire harness to be measured comprises: open circuit fault, dislocation fault, short trouble and non-fault, and the fault particular type of wire harness to be measured and the method for discrimination of position are as follows:

(1) open circuit fault, if:

Wherein, ; , represent knumber input terminal applies low level signal, and its corresponding lead-out terminal response is not low level entirely, therefore kthe corresponding wire harness of number input terminal exists and opens circuit.Its off position is: place's (input terminal node jplace exists and opens circuit).If , input terminal kplace opens circuit.

(2) dislocation fault, if:

??;

Wherein, .Represent number input terminal applies low level signal, and lead-out terminal low level number of responses is correct, but adjacent two lead-out terminals with response levels all there is mistake, therefore adjacent two lead-out terminal nodes and leaf node dislocation.

(3) short trouble, if:

In formula, , represent that two is adjacent or number given low level of input terminal, the lead-out terminal of two corresponding wire harness of input terminal all responds low level, an input terminal corresponding wire harness and another input terminal corresponding wire harness short circuit.

Step 222: test finishes.

Claims (2)

1. an automotive wire bundle detection method, adopt automotive wire bundle pick-up unit, this automotive wire bundle pick-up unit comprises microcomputer (106), microcomputer (106) is connected with respectively power circuit (102), address decoding circuitry (110), m control delivery outlet (108) and n control inputs mouth (114), and the output of address decoding circuitry (110) connects respectively n control inputs mouth (114) and m control delivery outlet (108); Control delivery outlet (108) and the equal control criterion logical signal of n control inputs mouth (114), it is characterized in that comprising the steps: for m
(1) respectively standard wire harness and wire harness to be measured are divided into groups by conduction, every group has a input terminal and b lead-out terminal, and m control delivery outlet (108) of a of standard wire harness input terminal connection, a b lead-out terminal are connected to a n control inputs mouth (114) and start to detect; Actual measurement capacity a * b is less than maximum measurement capacity m * n;
(2) from a input terminal of standard wire harness, choose successively a standard Wiring harness terminal, microcomputer (106) is controlled delivery outlet (108) by m and is applied low level signal to a standard Wiring harness terminal of choosing, all the other standard Wiring harness terminals apply high level signal, read simultaneously and store the standard wire harness response matrix Rs level signal being produced by b lead-out terminal response of n control inputs mouth (114) input; Repeat so successively until a standard wire harness terminal test finishes;
(3) from a input terminal of wire harness to be measured, choose successively a Wiring harness terminal to be measured, microcomputer (106) is controlled delivery outlet (108) by m and is applied low level signal to a Wiring harness terminal to be measured of choosing, all the other Wiring harness terminals to be measured apply high level signal, read simultaneously and store the wire harness response matrix Rc level signal to be measured being produced by b lead-out terminal response of n control inputs mouth (114) input; Repeat so successively until a Wiring harness terminal to be measured detects end;
(4) microcomputer (106) carries out dimensionality reduction computing to two described response matrix Rs of storage and Rc, by maximum measurement capacity m * n dimensionality reduction, is actual measurement capacity a * b, obtains standard wire harness response matrix after dimensionality reduction computing , and wire harness response matrix to be measured , matrix p=( p i,j ) ∈ r a * m, matrix q=( q i,j ) ∈ r n * b; Matrix peach row and matrix qeach row all only have an element 1, all the other elements are 0, by following steps, determine matrix pwith qelement:
Step 1, arranges matrix pfor null matrix;
Step 2, by following formula, find the line number that contains 0 element in standard wire harness response matrix Rs: ;
r u,v for standard wire harness response matrix r s element, ufor matrix line number, vfor rectangular array number, k[i]for standard wire harness response matrix r s the line number that contains 0 element, iit is standard Wiring harness terminal number;
Step 3, arranges null matrix by following formula p=[0] am in be 1 element:
p i, k[i] =1, i=1,2 ..., a, k[i]for standard wire harness response matrix r s the line number that contains 0 element, iit is standard Wiring harness terminal number;
Step 4, arranges matrix qelement:
r u,v for standard wire harness response matrix r s element, ufor matrix line number, vfor rectangular array number, k[j]for standard wire harness response matrix r s the row number that contain 0 element, jit is Wiring harness terminal number; qfor matrix qelement;
(5) microcomputer (106) compares the standard wire harness response matrix after dimensionality reduction by logical operation with wire harness response matrix to be measured the element of same position, obtains fault judgment matrix , the XOR that ⊕ is matrix element, if r e =[0] ab , wire harness non-fault to be measured, otherwise have fault.
2. a kind of automotive wire bundle detection method according to claim 1, is characterized in that: in step (5), if knumber input terminal applies low level signal, k∈ [1, a], corresponding lead-out terminal response is not low level entirely, kthe corresponding wire harness to be measured of number input terminal opens circuit; If knumber input terminal applies low level signal, and corresponding lead-out terminal low level number of responses is correct, and mistake all appears in adjacent two lead-out terminal response levels, adjacent two lead-out terminals dislocation; If the given low level signal of adjacent two input terminal, corresponding lead-out terminal all responds low level, the wire harness wire harness short circuit corresponding with another input terminal that an input terminal is corresponding.
CN201110054179.5A 2011-03-08 2011-03-08 Method for detecting automotive harnesses CN102156237B (en)

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