CN101498618A

CN101498618A - Logic validation system for BCM module

Info

Publication number: CN101498618A
Application number: CNA2008100430964A
Authority: CN
Inventors: 郭凤龙; 罗来军; 王士海; 孟永刚
Original assignee: Lianchuang Automotive Electronics Co Ltd
Current assignee: DIAS Automotive Electronic Systems Co Ltd; Lianchuang Automotive Electronics Co Ltd
Priority date: 2008-02-02
Filing date: 2008-02-02
Publication date: 2009-08-05

Abstract

The invention discloses a logic verification system of a BCM module, which comprises a signal simulator and a load simulator, wherein the signal simulator comprises a plurality of function buttons, a micro-control unit, a digital input-output port, a simulation input-output port and a standard port of a vehicle bus; the micro-control unit is used for outputting preset corresponding input signals of the BCM module according to the indication of the function buttons and logically verify the preset output signals of the BCM module and the actual feedback output signals of the BCM module; one path of the input signals of the BCM module reaches to the load simulator and the other path is sent back to the micro-control unit; and the load simulator displays the work condition of the BCM module according to LEDs. The system saves the human cost and the verification time during the development process of the BCM module, thereby being widely applied to the development and the verification of the BCM module.

Description

The logic verification system of BCM module

Technical field

The present invention relates to a kind of body of a motor car control product, particularly a kind of logic verification system of body of a motor car control product.

Background technology

Along with the body electric system system is complicated day by day, the input signal of car body controller increases sharply, and the logic coupling of signal is also tightr.In the performance history of body of a motor car control module (Body Control Module, be called for short BCM), the time that is used for the steering logic checking is more and more longer, and the Time To Market of product is had an immense impact on.

For finishing the logic checking of BCM, the manufacturer often assists the developer that each function of BCM module is carried out manual checking by the mode that increases the subtest personnel, builds instruction carriage (LabCar).Consequently improved the human cost of BCM exploitation on the one hand greatly; The required various gauge tap parts of LabCar often can not put in place on time on the other hand, and checking work can not be carried out smoothly, finally cause product to delay to go on the market.Therefore, the logic verification system of exploitation BCM is necessary.

Summary of the invention

The technical problem to be solved in the present invention provides a kind of logic verification system of BCM module, and it can reduce the cost of BCM logic checking and shorten proving period.

For solving the problems of the technologies described above, the logic verification system of BCM module of the present invention, it comprises signal simulator, load simulator; Signal simulator comprises the standard port of a plurality of function buttons, micro-control unit, digital input/output port, analog input output port and automobile bus, described micro-control unit is used for exporting according to the indication of function button the input signal of predefined corresponding BCM module, and the BCM module output signal that predefined BCM module output signal and actual feedback are returned is carried out logic checking; Described BCM module receives the signal from signal simulator, and its output signal one road is to described load simulator, and one the tunnel feeds back to described micro-control unit; Described load simulator receives the signal from the BCM module, by the working condition of the described BCM module of diode displaying.

The logic verification system of BCM module of the present invention by programmable signal simulator and load simulator, has fundamentally substituted subtest person and instruction carriage, realizes the input of BCM module by signal, and load receives, and whole work of BCM steering logic checking.Carry out double verification work by the proving program in LED lamp and the MUC module simultaneously, guarantee result's accuracy.Compare with the existing verification method that adopts, saved human cost and proving time in the BCM Development of Module process.

Description of drawings

The present invention is further detailed explanation below in conjunction with accompanying drawing and embodiment:

Fig. 1 is a BCM module logic verification system synoptic diagram of the present invention;

Fig. 2 is a signal simulator synoptic diagram of the present invention;

Fig. 3 is a digital output circuit synoptic diagram of the present invention;

Fig. 4 is a digital input circuit synoptic diagram of the present invention;

Fig. 5 is a MCU assistant adjustment signal acquisition circuit synoptic diagram of the present invention;

Fig. 6 is an analog output circuit synoptic diagram of the present invention;

Fig. 7 is an analog input circuit synoptic diagram of the present invention;

Fig. 8 is a load simulator synoptic diagram of the present invention;

Fig. 9 is that load simulator of the present invention is realized circuit diagram.

Embodiment

The logic verification system of BCM module of the present invention comprises signal simulator and load simulator, by wire harness signal simulator, BCM module and load simulator is connected into as shown in Figure 1 closed-loop path.The signal simulator (see figure 2) comprises a plurality of function buttons, micro-control unit (being the MCU module).The duty of vehicle body electrical equipment such as the windscreen wiper of BCM module controls, door lock (realizing certain function in other words) is subjected to the influence of 3～5 switching signals (this type of is digital signal) simultaneously, the signal that signal simulator is relevant with these is drawn and is placed on one group, and every group of function signal all has a function button to trigger.The MCU module can be carried out software programming, input signal information and the corresponding correct BCM module output signal information needs simulated according to the relevant information of BCM module are set in advance in the MCU module, and the BCM output signal of predefined BCM output signal and actual feedback collection is carried out the logic checking program.After certain function button on the signal simulator is pressed, the MCU module in the signal simulator will be exported corresponding one group of switching signal, be converted to the suitable signal form of BCM module by output port circuit and export to the BCM module.

The input signal of BCM module has simulating signal and digital signal, and digital signal is mainly the switching signal in the car, and simulating signal is mainly the sensor signal (temperature, rainfall, light intensity etc.) in the car.So include general digital input/output port and general analog input output port in the signal simulator, the interface that also includes car gage buses such as CAN bus, LIN bus and K_LINE bus in the signal simulator, these several port circuits all are adopted as existing general technology.Digital output port has three kinds of functions: (signal voltage range that transmits in the automobile is at 0～12V for cab signal emulation output, the output of MCU module assistant adjustment signal and pulse-width signal output, and the signal of MCU module input and output is 0～5V), a kind of common circuit connects sees Fig. 3, wherein the voltage transitions chip is general switch chip, mainly is translation function.Its principle of work when realizing cab signal emulation output function is: when the input port input control signal of voltage transitions chip is 5V, Dui Ying output port will be exported high level (12V) with it; When the input port input control signal of voltage transitions chip is 0V, Dui Ying output port will be in high-impedance state with it.Digital input port circuit of the present invention, it has three kinds of functions equally: standard input signal collection, MCU assistant adjustment signals collecting and pulse-width signal collection.The principle of work (see figure 4) of standard input signal collection is: the rate signal in most of cars is realized by the metal-oxide-semiconductor of an open-drain, after drawing on the resistance R 2, is shaped as square-wave signal; Square-wave signal is through behind D4 and the D5, is still square-wave signal in the base stage of triode Q1, this signal controlling triode Q1, the collector of Q1 export a square-wave signal opposite with its phase place (0～5V), to the terminal leads of MCU module, count.D4, D5 play a protective role in this circuit, and the effect that R4 and C4 start filtering, disappear and tremble.When carrying out MCU assistant adjustment signals collecting, the digital input circuit (see figure 5) of realization and above-mentioned slightly different, input signal directly transfers the input pin to MCU after disappearing and tremble by D19 amplitude limit, resistance R 18, and wherein resistance R 28 mainly plays the current-limiting protection effect.Analog output circuit has two kinds of functions: cab signal emulation output (the level adjustable extent is at 0～12V, and adjustable accuracy is 0.1V continuously) and MCU module assistant adjustment signal output (the level adjustable extent is at 0～5V, and adjustable accuracy is 0.2V continuously).A kind of general cab signal emulation output port circuit structure is seen Fig. 6, is used in different in the digital circuit at this voltage transitions chip (also for commonly used a kind of aanalogvoltage conversion chip) with above-mentioned.It can finish aanalogvoltage output, adjustable between output area 0～12V, its principle of work is that 12V voltage is exported in PWM (pulse length modulation principle) mode, by changing the dutycycle of PWM, the output voltage values of voltage transitions chip is changed between 0～12V.Analog input circuit has two kinds of functions: standard analog signal collection (level adjustable extent 0～12V, adjustable accuracy is 0.1V continuously); MCU assistant adjustment signals collecting (level adjustable extent 0～5V, adjustable accuracy is 0.2V continuously).A kind of general collection of simulant signal circuit is seen Fig. 7; its principle of work is: after signal is handled through divider resistance; voltage range is adjusted to the scope of 0～5V; in order to satisfy the analog sampling scope of MCU module; resistance R in the circuit and capacitor C constitute provides wave filter; effectively filtering the electromagnetic interference (EMI) in the signal, and stabilivolt plays the limited amplitude protection effect.CAN interface in the signal simulator can adopt the auspicious or CAN2.0B of CAN2.0B standard expansion auspicious, and the LIN interface can adopt LIN1.3 or LIN2.0.

The signal of exporting from signal simulator exports in the load simulator after the BCM module, is used for verifying intuitively the working condition of BCM module.The block diagram of load simulator is seen Fig. 8, and the signal of various test difference in functionalitys is imported from corresponding interface, sends into breakdown switch through preposing signal process circuit, enters the LED lamp from the breakdown switch signal that comes out, and intuitively reacts the situation of BCM work by the LED lamp.Fig. 9 has provided a concrete realization circuit, state (high-low level) with output signal in this circuit converts opening or closing of LED to via triode, when the base stage of triode receives high level, the LED lamp is bright, and when the base stage of triode receives low level, the LED lamp does not work, and reacts the situation of BCM module output signal thus.Simultaneously from the BCM module output signal feeds back to MCU module the signal simulator, the BCM output signal set in the MCU module and the BCM module by signal of actual acquisition are carried out logic checking by predefined logic checking program.The logic checking function realizes by the software among the MCU: the developer can be according to predetermined input, output logic relation, at first the setting signal simulator is exported specific logical signal (sequence), read the output end signal state by feedback then, with itself and predetermined logic relationship match, if meet then show that the steering logic of controller is correct, otherwise show the controller logic mistake.

Realize that with test b CM module the door lock analog functuion is the workflow that example is described BCM logic verification system of the present invention: at first by software programming with the input signal information of the BCM module that will test and accordingly correct output signal information write in the MCU module; Press the door lock function button and carry out the door lock function checking, trigger MCU module output editor's door lock input signal in advance, undertaken exporting the BCM module to after the voltage transitions by digital output port; After the BCM module receives signal, operation also outputs signal to load simulator, by the state of LED lamp reaction output signal, when system moves, can be according to the lighting or extinguish the incoming level state of judging diode negative terminal in the circuit intuitively of LED, and then to determining the output state of BCM.For example: should export high level by setting the BCM module, and the LED lamp does not work, and illustrates that this function of BCM module has fault.The output signal of BCM module feeds back in the MCU module by digital input port on the other hand, by the logic checking program in the MCU module output signal and the predefined output signal of reality are carried out logic checking, its result can show by being connected with computer.Verify from two aspects like this, but guarantee result's accuracy.

Claims

1, a kind of logic verification system of BCM module is characterized in that: comprise signal simulator, load simulator; Described signal simulator comprises the standard port of a plurality of function buttons, micro-control unit, digital input/output port, analog input output port and automobile bus, described micro-control unit is used for exporting according to the indication of function button the input signal of predefined corresponding BCM module, and the BCM module output signal that predefined BCM module output signal and actual feedback are returned is carried out logic checking; Described BCM module receives the signal from signal simulator, and its output signal one road is to described load simulator, and one the tunnel feeds back to described micro-control unit; Described load simulator receives the signal from the BCM module, by the working condition of the described BCM module of diode displaying.

2, according to the logic verification system of the described BCM module of claim 1, it is characterized in that: described a plurality of function buttons comprise car light function button, door lock function button, windscreen wiper function button, skylight function button, seat function button and vehicle window function button.