CN202453684U

CN202453684U - Control device for measuring runout of automobile wheel hub

Info

Publication number: CN202453684U
Application number: CN201120553733XU
Authority: CN
Inventors: 于继翔; 李龙辉; 杨震
Original assignee: Changan University
Current assignee: Changan University
Priority date: 2011-12-27
Filing date: 2011-12-27
Publication date: 2012-09-26
Anticipated expiration: 2021-12-27

Abstract

The utility model discloses a control device for measuring the runout of an automobile wheel hub, which comprises a roller and a servo mechanism, wherein the servo mechanism comprises a stepping motor and a limit switch; four sensors are connected with roller, are paired and respectively used for measuring the runout of the roller in the X direction and the Y direction, and are respectively connected with a singlechip; and the singlechips are connected with the stepping motor of the servo mechanism. According to the device provided by the utility model, the measuring head motion can be accurately controlled during the measurement of the wheel hub, from the initial position of the measuring head, the data can be acquired and then is transmitted to the singlechips, thereby obtaining more accurate runout of the automobile wheel hub.

Description

A kind of control device that is used for measured automobiles wheel hub jerk value

Technical field

The utility model relates to automotive hub jerk value field of measurement, relates in particular to a kind of control device that is used for measured automobiles wheel hub jerk value.

Background technology

China is second largest in the world automotive hub producing country, annual about 5,000 ten thousand of the automotive hub of producing, wherein have 1/3 sell to external.Fierceness day by day along with market competition; The enterprises'original quality inspection method can't reach the requirement of businessman; Many external full-sized car manufacturing enterprises all require wheel hub supplier to check one by one the product of being produced, and will on each wheel hub, mark the corresponding techniques parameter simultaneously; The wheel hub check system requires wheel hub manufacturing enterprise must be furnished with full-automatic checkout equipment and satisfies market demands from inspecting full inspection by random samples.

The principle of existing measured automobiles wheel hub jerk value detects referring to Fig. 1; In automotive hub jerk value measuring process; In order to reach micron-sized measuring accuracy; Must guarantee the repetitive positioning accuracy of sensor head, thus the error that elimination wheel hub central axis and wheel measuring axle decentraction cause, and sampling error.Therefore, require the measuring head repetitive positioning accuracy high,, adopt the sampling pattern of many circles angular misalignment when wheel hub slowly rotates.Existing measuring equipment has generally comprised a pair roller 1 (gauge head); Roller 1 is driven by servo control mechanism; During measurement roller 1 is directly pressed close to the tested surface (assigned address that inner tube of a tyre ring support and cover tire ring support are measured) of wheel hub 2 through servo control mechanism, when wheel hub 2 rotated, jerk value made gauge head move along X, Y direction; Produce micro displacement, this displacement is tested jerk value.

But the precision of present checkout equipment is not high, therefore existing checkout equipment is improved being very important.

Summary of the invention

The purpose of the utility model is; A kind of control device that is used for measured automobiles wheel hub jerk value is provided; This device utilizes Freescale MC9S12 series MC9S12DP256 single-chip microcomputer as the core control element, and it is a kind of processor of 16 bit CPUs, and similar relatively having increased much of this processor newly instructed; 11 kinds of addressing modes are arranged, so increased the accuracy of control greatly.Can guarantee the repetitive positioning accuracy of sensor head; Eliminate the error that wheel hub central axis and wheel measuring axle decentraction cause; Effectively improve the measuring accuracy of jerk value and the operability of wheel hub measuring machine, improve the controllability of measuring machine, the operator is easy to the utilization of the equipment of grasping simultaneously; So just can increase work efficiency, shorten working hours.

To achieve these goals, the utility model adopts following technical scheme to be achieved:

A kind of control device that is used for measured automobiles wheel hub jerk value comprises roller and servo control mechanism, and servo control mechanism is made up of stepper motor and limit switch; On roller, be connected with four sensors, wherein, four two of sensors are a pair of; Measure the directions X of roller and the jerk value of Y direction respectively; It is characterized in that four sensors connect a single-chip microcomputer respectively, single-chip microcomputer is connected with the stepper motor of servo control mechanism.

Other characteristics of the utility model are: described single-chip microcomputer adopts the MC9S12DP256 single-chip microcomputer.

The control device that is used for measured automobiles wheel hub jerk value of the utility model; Can be in the process that wheel hub is measured to gauge head motion control accurately; Gauge head can carry out the collection of data from incipient position; Then measurement data is sent on the single-chip microcomputer automatically, thereby obtains measuring more exactly the automotive hub jerk value.

Description of drawings

Fig. 1 is automotive hub jerk value measuring principle figure;

Fig. 2 is Freescale Single-chip Controlling wheel hub measuring principle figure

Fig. 3 is the clock circuit and the phaselocked loop filtering circuit of MC9S12DP256 single-chip microcomputer;

Fig. 4 is an I/O port assignment table;

Fig. 5 is the measuring process process flow diagram;

Explain further details below in conjunction with the The Hardware Design of accompanying drawing to the utility model.

Embodiment

Referring to Fig. 2, present embodiment provides a kind of control device that is used for measured automobiles wheel hub jerk value, comprises roller and servo control mechanism; Servo control mechanism is made up of stepper motor and limit switch, on roller, is connected with four sensors, wherein; Four two of sensors are a pair of; Measure the directions X of roller and the jerk value of Y direction respectively, four sensors connect a single-chip microcomputer respectively, and single-chip microcomputer is connected with the stepper motor of servo control mechanism.

During measurement, four sensors come inboard tire bead seat and outboard tire bead seat are measured, and wherein two groups of gauge heads of two step motor control move to the assigned address of inner tube of a tyre ring support and the measurement of cover tire ring support, and stepper motor and limit switch cooperate the formation servo-drive system.For the wheel hub of different size parameter, serial communication interface can be delivered to these parameters in the single-chip microcomputer.The computer program that single-chip microcomputer is built-in; Be used to control the motion of gauge head, can also control the motion of tested part simultaneously according to different parameters, single-chip microcomputer is to 4 Stepping Motor Control; And after accomplishing the one-shot measurement task; Stepper motor indication gauge head is got back to original position, all needs single-chip microcomputer to handle, present embodiment selected capture function good and with the dynamic MC9S12DP256 single-chip microcomputer of debugged program.

The MC9S12DP256 single-chip microcomputer is mainly accomplished the motion of gauge head, the collection of jerk value and the processing of data as the control core.The MC9S12DP256 single-chip microcomputer is the MC9S12 series monolithic of Freescale.The central processing unit that its adopts is 16 a CPU processor, and this CPU processor has increased a lot of new instructions, addressing mode from before 7 kinds be increased to 11 kinds.The storer of MC9S12DP256 single-chip microcomputer has following 3 kinds: 256kB Flash storer; The RAM of 12kB; The EFPROM of 4kB.

The MC9S12DP256 single-chip microcomputer has reusable address data bus, and it can be operated in single chip mode, also can and increase on the I/O interface circuit chips through bus extension storage space, is operated in extended mode.20 of address buss, 16 or 8 of data lines, address and data bus take 38 bit parallel I/O interfaces.Under single chip mode, can make common I/O interface usefulness for these 24.The MC9S12DP256 single-chip microcomputer has two 8 tunnel 10 precision A/D converters.

There are 5 controller local area network modules MC9S12DP256 single-chip microcomputer inside; Each CAN has 2 send buffers and 3 emission buffer zones, and each CAN has transmission (RX), receive (TX), 4 independently interrupting channels such as make mistakes, wake up, and the CAN module has self-checking function; LPF is arranged; Arousal function is arranged, the CAN0 passage when the CAN, J1850 communication port how.

The hardware designs explanation:

With reference to Fig. 1, the main task of the MC9S12DP256 SCM peripheral circuit in the device comprises: show that respectively organizing gauge head displacement, spindle motor rotational angle position, each sampled point jerk value DATA REASONING and processing, communication interface and reference switches inserts electric level interface etc.

With reference to figure 2, the sensor (1,2 that connects on the gauge head; 3,4) be connected with the I/O port of MC9S12DP256 single-chip microcomputer, the signal that sensor receives passes to the MC9S12DP256 single-chip microcomputer and carries out analyzing and processing; The MC9S12DP256 single-chip microcomputer is differentiated the Displacement Measurement amount according to built-in program, and definite then gauge head is got back to the exact position of origin-location, utilizes COM1 to feed back to gauge head and stepper motor; Thereby can guarantee the repetitive positioning accuracy of sensor head; Eliminate the error that firm central axis of wheel and wheel measuring axle decentraction cause, and sampling error, measuring accuracy improved greatly.

With reference to Fig. 3, the clock circuit of MC9S12DP256 single-chip microcomputer and phaselocked loop filtering circuit are because single-chip microcomputer and system's operation need two pacing itemss, i.e. power supply and clock.The used single-chip microcomputer of native system has two kinds of clock circuits.The clock circuit of the MC9S12DP256 single-chip microcomputer of standard is through being connected on the external crystal-controlled oscillation of a 16MHz on single-chip microcomputer external crystal-controlled oscillation input interface EXTAL and the XTAL; Utilize MC9S 12DP256 inner voltage controlled oscillator and phaselocked loop (PLL) to bring up to 25MHz to this frequency then, as the clock of single-chip microcomputer internal bus.Reset circuit be simultaneously in order to let in the system current potential more stable, and reset circuit has used the low-voltage chip MC34064 that resets.What the inside chip of system's microcontroller power supply circuit used is 3V voltage, and I/O port and externally fed voltage are 5V, and the filtering circuit that the inductance capacitance in the power circuit constitutes can improve the Electro Magnetic Compatibility of system, and the reduction system is to the high frequency interference of power supply.

With reference to Fig. 4, it is as follows that this installs needed input and output interface, because the MC9S12DP256 single-chip microcomputer has up to more than 90 I/O mouths, so no longer need the expansion interface chip, the requirement of global design is also more simplified.

With reference to Fig. 5, wanting accurately to measure the wheel hub jerk value needs single-chip microcomputer that gauge head motion is controlled accurately, and gauge head is mobile data from incipient position, lets gauge head oneself move to the initial position that begins most again, at last measurement data is sent to host computer automatically.The most important thing is moving and start-stop on the upper and lower and horizontal direction of step motor control gauge head in the whole measuring process.Stepper motor is the control element that electric impulse signal is changed into angular displacement or displacement of the lines, and it can be controlled the anglec of rotation and velocity of rotation, and it is widely used in various control system and precision optical machinery field as control element.

Relation between MC9S12DP256 single-chip microcomputer and the micrometric displacement detection part is embodied in 3 aspects, on the one hand is that gauge head needs micrometric displacement when moving to by the wheel hub measuring point, and detection part is controlled motor respectively according to current pressure value.Because it is an accurate control procedure that gauge head moves to the measured point, gauge head can influence measured effect to the size of wheel hub amount of pressure.Other two aspects are that the start and stop of order sampling finish back micrometric displacement detection system transmission sampled data with sampling.Utilize above characteristics, can carry out accurate measurement automotive hub jerk value.

Claims

1. a control device that is used for measured automobiles wheel hub jerk value comprises roller and servo control mechanism, and servo control mechanism is made up of stepper motor and limit switch; On roller, be connected with four sensors, wherein, four two of sensors are a pair of; Measure the directions X of roller and the jerk value of Y direction respectively; It is characterized in that four sensors connect a single-chip microcomputer respectively, single-chip microcomputer is connected with the stepper motor of servo control mechanism.

2. the control device that is used for measured automobiles wheel hub jerk value as claimed in claim 1 is characterized in that, described single-chip microcomputer adopts the MC9S12DP256 single-chip microcomputer.