CN207924048U - A kind of generator of heavy truck failure detector - Google Patents

Abstract

The utility model is related to a kind of generator of heavy truck failure detectors, including SCM system, display screen and vehicle-mounted terminal equipment；Wherein, the display screen connects SCM system by SPI interface；SCM system includes processor, memory, A/D modules, timer ECT modules, SPI interface, CAN interface, vehicle-mounted terminal equipment is connected by CAN interface and is connected with vehicle CAN network, 3 groups of terminals are connected by A/D modules, 3 groups of terminals are connected with generator B+ terminal voltages, the ends B+ electric current and the ends L respectively, are connected with the ends W by ECT modules；Vehicle-mounted terminal equipment includes GPS module, GPRS module and CAN interface.The utility model is compared by the multi-channel data acquisition under different operating modes and with normal data, and synthesis obtains accurate fault message, effectively reduces erroneous judgement ratio, has positive technical meaning.

Description

A kind of generator of heavy truck failure detector

Technical field

The utility model is related to a kind of generator of heavy truck failure detectors, belong to automotive check maintenance technique neck Domain.

Background technology

In present automobile, due to the extensive use of electronic equipment, generator is in the operation process of automobile must not Can be less；Therefore it when generator breaks down, needs to complete to repair as early as possible.And due to the structure feature of generator so that therefore The judgement of barrier point is more needed by detection.Traditional automobile current generator field of fault detection, without dedicated detection device； Vehicle occur generator do not generate electricity failure when, usually measure several places' electricity using the tools such as multimeter or oscillograph by attendant Pressure value relies on micro-judgment that must be out of order conclusion again, it is easy to cause erroneous judgement problem, influence maintenance efficiency.In practice, power generation Machine fault-free itself, but disassemble the case where returning factory because of erroneous judgement and occupy higher proportion.

And heavy-duty car operating mode is changeable, running environment is complicated, the installation space of generator is extremely compact, is using general-purpose There is the problems such as operation is limited when the traditional detection tools such as table or oscillograph；And heavy-duty car integral vehicle cost and operating cost are equal Higher, maintenance efficiency is low to cause larger stoppage in transit to be lost, and erroneous judgement causes additional increased generator freight to be lost also very Greatly, also larger to the negative effect of vehicle enterprise after cost and prestige on quality.

Therefore, a kind of new generator of heavy truck failure detector is designed, the efficiency that generator failure judges is improved And accuracy, it is those skilled in the art's urgent problem to be solved.

Invention content

To solve, diagnosis efficiency is low existing for generator of heavy truck failure detector in the prior art, erroneous judgement is more Problem, the utility model provide a kind of generator of heavy truck failure detector, and oneself of failure is carried out using SCM system It is dynamic to judge, effectively solve the problems, such as the efficiency and accuracy rate of breakdown judge.

The utility model uses following technical proposals：

A kind of generator of heavy truck failure detector, which is characterized in that including：SCM system, display screen and vehicle Mounted terminal equipment；

Wherein, the display screen connects SCM system by SPI interface；

SCM system includes processor, memory, A/D modules, timer ECT modules, SPI interface, CAN interface, is led to It crosses the CAN interface connection vehicle-mounted terminal equipment and is connected with vehicle CAN network, connect 3 groups by A/D modules connects with generator The terminals connect；In 3 groups of terminals, 1 group is separately connected B+ terminal voltages collection point, the ends B+ current acquisition point, 1 group and power generation The ends machine L are connected, and 1 group is connected by ECT modules with the ends W；

Vehicle-mounted terminal equipment includes GPS module, GPRS module and CAN interface, wherein the CAN interface and GPS module It is connected separately in GPRS module.

Preferably, 16 Freescale MC9S12XEP100 of the SCM system model；The A/D of the microcontroller Module is separately connected the ends generator B+, the ends L for acquiring B+ voltages, B+ electric currents and L terminal voltages, the microcontroller timer ECT The module ends connection generator W are for acquiring generator speed；The normal ends B+ of generator are stored in the memory of the microcontroller Output voltage, the ends B+ output current, the ends L excitation voltage, the ends W tachometer value.

A kind of detection method using above-mentioned generator of heavy truck failure detector, which is characterized in that including as follows Step：

Step 1 outside line detects：

Under vehicle static operating mode, the detection device is connected to the ends B+, the ends L and the ends W of generator, acquires generator The ends L virtual voltage Ul ' and compared with the normal voltage U1 of storage；

Such as Ul '<Ul, then judging outside line, there are failures, are transferred to step 3；

Such as Ul ' >=Ul, then judge that outside line is intact, is transferred to step 2；

Step 2 generator itself detects：

Under vehicle dynamic operation condition, acquisition B+ end virtual voltage Ub ' and actual current Ib ', the ends W actual speed data Nw ', and compared with standard value Ub, Ib, Nw of storage；

Such as Ub ' ＜ Ub or Ib ＜ Ib ' or Nw ' ＜ Nw, then judge that there are failures for generator；Otherwise, then judge generator It is normal；

It is transferred to step 3；

Step 3 information exports：

Measurement data and judgement result are sent to the display screen and vehicle-mounted terminal equipment by SCM system；

Display screen is received by SPI interface and shows measurement data and judgement result；

The data received and GPS information are switched to communication signal output by the GPRS module of vehicle-mounted terminal equipment；

Detection finishes.

The utility model has the following advantages that：

The utility model is compared by the multi-channel data acquisition under different operating modes and with normal data, comprehensive to obtain accurately Fault message effectively reduces erroneous judgement problem, solves the deficiencies in the prior art place.

Description of the drawings

Fig. 1 is the example structure schematic diagram of detection device in the utility model；

Fig. 2 is detection device data acquisition schematic diagram in the utility model.

Specific implementation mode

The utility model is further illustrated with reference to the accompanying drawings and examples.

As shown in Figure 1 to Figure 2, the present embodiment is a kind of generator of heavy truck failure detector, including microcontroller system System, display screen and vehicle-mounted terminal equipment.

SCM system includes processor, memory, A/D modules, timer ECT modules, SPI interface, CAN interface, is led to It crosses the CAN interface connection vehicle-mounted terminal equipment and is connected with vehicle CAN network, 3 groups of terminals are connected by A/D modules, such as Shown in Fig. 2, in 3 groups of terminals, 1 group is separately connected B+ terminal voltages collection point, the ends B+ current acquisition point, 1 group with generator L Terminal voltage collection point is connected, and 1 group is connected by ECT modules with the ends W rotating speed collection point；Each collection point is usually wiring cylindricality Formula, with the winding of bare wire head or metal wire clamping connection line.

SCM system uses 16 Freescale MC9S12XEP100 in the present embodiment, is Freescale company car Grade product, be internally integrated 12 high-precision A/D-modules, Enhanced Timer ECT modules, serial communication bus SPI interface, CAN interface, wherein A/D modules are used to acquire the output voltage and current value of generator, utilize the input capture function of ECT modules Acquire the ends the W frequency tach signal of generator.The power module of the SCM system is TEL4473GV52, the power module Can electricity directly be taken from vehicle battery, and powered to entire detection device.

The vehicle-mounted terminal equipment includes GPS module, GPRS module and CAN interface, wherein the CAN interface and GPS Module is connected separately in GPRS module.GPRS module uses model HSAE HVT300 in the present embodiment.Terminal device is logical Detection data and fault message that CAN interface connection SCM system obtains generator are crossed, the position of vehicle is obtained based on GPS module Confidence ceases, and the information such as the generator failure data being collected into and vehicle location are sent to the clothes of vehicle enterprise by GPRS module Business device platform.The transmission of this part signal need not be separately described in detail using mature technology, market complete sets of products.

Display screen is the color LCD screen with SPI communication interface, and the generator that microcontroller is sent out is obtained by SPI interface Fault data is used for presentation of information.

According to the product characteristic of generator of heavy truck, in advance when SCM system storage inside generator works normally Normal data be：The ends B+ normal voltage Ub, the B+ end ends normalized current Ib, L normal voltage Ul, the ends W rated rotational frequency data Nw, this Embodiment Plays data are Ub=27V, Ib=45A, U1=2V, Nw=2000r/min.Data in Single-Chip Computer System acquisition connection is as schemed Shown in 2, the ends B+ virtual voltage Ub ', the ends B+ actual current Ib ', the ends the L virtual voltage Ul ' of measurement, the ends W actual speed data Nw′.SCM system normal data is compared with actual measurement data it is comprehensive obtains fault message, and by measurement data and Diagnostic message is sent to display screen by SPI communication interface respectively and is shown for detection data and fault message, passes through CAN network It is sent to vehicle-mounted terminal equipment.

Detection method using generator of heavy truck failure detector described in the present embodiment includes the following steps：

Step 1 outside line detects：

When heavy-duty car occur generator do not generate electricity failure when, maintenance personal is by detection device connection and the B+ of generator End, the ends L and the ends W.Maintenance personal is under vehicle static operating mode, i.e., key electricity but inoperative engine, use the device on vehicle Generator excitation L end virtual voltage Ul ' are acquired, such as virtual voltage Ul '<Normal voltage Ul then judges the outside line of generator There are failures, are transferred to step 3；Such as Ul ' >=Ul, then judge that outside line is intact, is transferred to step 2；Which can effectively reduce mistake Sentence the loss brought；

Step 2 Generator test：

Under vehicle dynamic operation condition, i.e., maintenance personal starts engine, uses device acquisition virtual voltage Ub ', reality Electric current Ib ', virtual voltage Ul ', actual speed data Nw '；SCM system after generator of heavy truck elder generation separate excitation according to encouraging oneself Working characteristics judged；Such as Ub ' ＜ Ub or Ib ＜ Ib ' or Nw ' ＜ Nw, then judge that there are failures for generator；Otherwise, then Judge that generator is normal；

Then switch into step 3；

Step 3 information exports：

Measurement data and judgement result are sent to the display screen and vehicle-mounted terminal equipment by SCM system；

Display screen is received by SPI interface and shows measurement data and judgement result；

It is defeated that the data received from CAN interface are switched to communication signal by the GPRS module of vehicle-mounted terminal equipment with GPS information Go out；

Detection finishes.

The foregoing description of the disclosed embodiments enables professional and technical personnel in the field to realize or use this practicality new Type.A variety of modifications of embodiment will be apparent to those skilled in the art, it is as defined herein General Principle can be realized in other embodiments without departing from the spirit or scope of the present utility model, not given The part presented with partial enlargement is described in detail, is the prior art, herein without repeating.Therefore, the utility model will not It is intended to be limited to the embodiments shown herein, and is to fit to consistent with principles disclosed herein and feature widest Range.

Claims (2)

1. a kind of generator of heavy truck failure detector, which is characterized in that including：SCM system, display screen and vehicle-mounted Terminal device；

Wherein, the display screen connects SCM system by SPI interface；

SCM system includes processor, memory, A/D modules, timer ECT modules, SPI interface, CAN interface, passes through institute It states CAN interface connection vehicle-mounted terminal equipment and with vehicle CAN network to be connected, be connected with generator by 3 groups of A/D modules connection Terminals；In 3 groups of terminals, 1 group is separately connected B+ terminal voltages collection point, the ends B+ current acquisition point, 1 group with generator L End is connected, and 1 group is connected by ECT modules with the ends W；

Vehicle-mounted terminal equipment includes GPS module, GPRS module and CAN interface, wherein the CAN interface is distinguished with GPS module Signal is connected to GPRS module.

2. detection device according to claim 1, which is characterized in that the SCM system model 16 Freescale MC9S12XEP100；The A/D modules are separately connected the ends generator B+, the ends L for acquiring B+ voltages, B+ electric currents With L terminal voltages, the microcontroller timer ECT modules ends connection generator W are for acquiring generator speed；The microcontroller The normal ends the B+ output voltage of generator, the ends B+ output current, the ends L excitation voltage, the ends W tachometer value are stored in memory.