CN202049387U

CN202049387U - ECU (Electronic Control Unit) and CCP (CAN Calibration Protocol) calibration device

Info

Publication number: CN202049387U
Application number: CN2010205995884U
Authority: CN
Inventors: 冯占军; 钱贾敏; 丁锋; 朱治兵; 陈子顺
Original assignee: United Automotive Electronic Systems Co Ltd
Current assignee: United Automotive Electronic Systems Co Ltd
Priority date: 2010-11-10
Filing date: 2010-11-10
Publication date: 2011-11-23
Anticipated expiration: 2020-11-10

Abstract

The utility model discloses an ECU (Electronic Control Unit) and CCP (CAN Calibration Protocol) calibration device. The calibration device comprises a bus interface, an RAM (Random Access Memory), a CAN transceiver and a CAN interface, wherein the RAM is connected with the bus interface and comprises two parts; the CAN transceiver is connected with the bus interface, and the CAN interface is connected with the calibration device; and an external chip selection signal line controls the switching of the two parts of the RAM. The calibration device can reduce the calibration complexity of an ECU, and abbreviating the volume for calibrating the ECU so as to set the size of the ECU equal to that of a batch-produced ECU. In addition, the cost is greatly saved so that the development expense of the whole project is reduced.

Description

CCP caliberating device among the ECU

Technical field

The utility model relates to a kind of Automobile Detection device, is specifically related to a kind of automobile ECU pick-up unit.

Background technology

ECU (Electronic Control Unit) electronic control unit claims " car running computer ", " vehicle-mounted computer " etc. again.From purposes then is the automobile specified microcomputerized controller, also is the automobile specified single-chip microcomputer.It is the same with common single-chip microcomputer, is made up of large scale integrated circuits such as microprocessor (CPU), storer (ROM, RAM), input/output interface (I/O), analog to digital converter (A/D) and shaping, drivings.The function of ECU (Electrical Control Unit) (ECU) is to carry out computing, processing, judgement according to the information that the program of its internal memory and data are taken into account various sensors inputs to air mass flow, output order then, and the electric impulse signal that certain width is provided to fuel injector is with the control distributive value.ECU (Electrical Control Unit) is made up of microcomputer, input, output and control circuit etc.

The voltage power supply scope of ECU generally at 6.5-16V (inner key aspect has stable-pressure device), working current in 0.015-0.1A, working temperature at subzero 40-80 degree.Can bear the following vibration of 1000Hz, therefore the probability of ECU damage is very little, CPU is the core in ECU, it has the function of computing and control, engine is when operation, and it gathers the signal of each sensor, carries out computing, and change the result of computing into control signal, the work of control controlled device.It also carries out the control to storer (ROM, RAM), input/output interface (I/O) and other external circuit; The program of depositing among the storer ROM is to be the basis through accurate Calculation and a large amount of data of getting of testing, and this intrinsic program constantly compares and calculates with the signal of gathering each sensor that comes when engine operation.The control of multiple parameters such as the igniting of comparison and result calculated control engine, air-fuel ratio, idling, exhaust gas recirculation.

On some intermediate cars, not only on engine, use ECU at present, all can find the trace of ECU in other many places.For example anti-lock braking system, 4 wheel drive systems, electronic automatic transmission, active suspension system, air bag system, multidirectional adjustable automatically controlled seat etc. all dispose ECU separately.Along with the raising of car electronization robotization, ECU will be increasing, and circuit can be complicated day by day.In order to simplify circuit and to reduce cost, the information transmission on the automobile between a plurality of ECU will be adopted a kind of multiplex communication network technology that is called, with ECU formation a network system, just the CAN data bus of car load.

In the ECU performance history, need carry out real-time online to many parameters among the ECU and revise demarcation, to reach the optimum in the control, the comfortableness of driving and better fuel characteristic.Before this, use complicated peripherals more, as ETK etc., by high speed ETK interface ECU is connected on the Pc, thereby carries out communication with ECU, it is measured and demarcates, and the signal on the monitoring vehicle bus.Use ETK to demarcate, the cost height is changed big to ECU.Development along with calibration technique, ASAM has organized to set up CCP (The CAN Calibration Protocol, CAN calibration protocol [ASAP standard]) standard communication protocol, CAN interface by ECU itself is realized on-line proving, the utility model is exactly the CCP agreement of relying on ASAM, and present ECU is applied for by the CCP calibrating function that extends out the technology realization.

The utility model content

Technical problem to be solved in the utility model provides CCP caliberating device among a kind of ECU, and it can reduce the complicacy that ECU demarcates, and can abridge and demarcate the volume of ECU, is provided with can keep and batch identical size of product ECU.

In order to solve above technical matters, the utility model provides CCP caliberating device among a kind of ECU; Comprise: bus interface; The RAM storer is connected with bus interface, and the RAM storer is divided into two parts; CAN transceiver and CAN interface, CAN transceiver junctor highway interface, the CAN interface links to each other with calibration facility; Outer plate is selected the switching of two parts of signal wire control RAM storer.

The beneficial effects of the utility model are: reduced the complicacy that ECU demarcates, can abridge and demarcate the volume of ECU, be provided with and can keep and batch identical size of product ECU.On cost, also save greatly in addition, reduce the development cost of whole project.

Described RAM storer is divided into reference page and two parts of working page.

The capacity of two parts of described RAM storer equates.

Described outer plate is selected signal wire conduct location line superlatively.

Description of drawings

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.

Fig. 1 is the synoptic diagram of the described SRAM of the extending out storer of the utility model embodiment;

Fig. 2 is the block scheme of the described CCP external expanding plate of the utility model embodiment.

Embodiment

The core processor that ECU adopted has determined the methods and strategies that CCP realizes.Because the matched data district is in the ROM that can not rewrite, realize online real-time calibration, need to revise these zones, how to revise these zones and realize CCP in demarcating the reference page and working page to switch be the technical problem underlying that will solve.

CCP described in the utility model demarcates the realization technology and realizes by extending out the RAM mode, as shown in Figure 1, extends out the SRAM storer on original external bus interface, and controls outside chip selection signal and select the external RAM space.POH2 is defaulted as high level, and after access extended out RAM CCP plate, this IO state was a low level.

Fig. 2 is the block scheme of CCP external expanding plate.Mainly comprise bus interface, the RAM storer of 512KB, CAN transceiver and CAN interface.The RAM storer is divided into the zone of two 256KB, the switching that has IO mouth line to realize going up the latter half as location line superlatively, and corresponding CCP demarcates and interrupts RP and WP zone.CAN transceiver connected system is used for doing the CAN port of demarcating usefulness.The CAN interface links to each other with calibration facility.

Processor among the ECU described in the utility model supports that the address remaps function, and in ECU, leave external bus interface, purpose is to use ETK equipment to measure demarcation, this bus interface provides the whole pins and the function of outside expansion, for keeping and the complete compatibility feature of matured product, the address that the related CCP implementation method of the utility model makes full use of original ETK interface and controller remaps characteristic, extend out the RAM storer by interface, will the matched data zone in ROM be mapped as external RAM space with the address, the ram region that visit that can be transparent when ECU reads the matched data district can be revised, so just can realize the online in real time modification of matched data, the matching feature of CCP is achieved by this kind method.When the coupling slip-stick artist demarcates matched data, not only to revise matching parameter, change outside some controlled variable of controller, also can compare according to the matched data and the amended parameter of acquiescence, observe the operation difference in the reality, therefore mating the slip-stick artist can constantly switch at working page and reference page, and when switching, parameter is wanted working of online in real time.Therefore the address such as must original matched data in ROM divide into but two parts of possibility non-equivalence, for realizing this function, the related technology of this utility model utilizes two big or small pages such as grade respectively as reference page or leaf and working page, and the switching of two pages is controlled switching by an output port of processor.Before the matched data among the ROM being mapped to outside RAM, earlier the matched data district among the ROM is copied to respectively in working page and the reference page, working page can be by coupling slip-stick artist change, and reference page is still in RAM, but the calibration tool restriction is revised data in this industry and guaranteed not to be modified with reference to the data in already.

The implementation method of demarcating the CCP that relates in the utility model has reduced the complicacy that ECU demarcates, and can abridge and demarcate the volume of ECU, is provided with can keep and batch identical size of product ECU.On cost, also save greatly in addition, reduce the development cost of whole project.This technology can be used in other automobile-used control of using same processor.

The capacity of two parts of described RAM storer equates.

The utility model is not limited to embodiment discussed above.More than the description of embodiment is intended in order to describe and illustrate the technical scheme that the utility model relates to.Based on the conspicuous conversion of the utility model enlightenment or substitute and also should be considered to fall into protection domain of the present utility model.Above embodiment is used for disclosing best implementation method of the present utility model, so that those of ordinary skill in the art can use numerous embodiments of the present utility model and multiple alternative reaches the purpose of this utility model.

Claims

1. CCP caliberating device among the ECU; It is characterized in that, comprising:

Bus interface;

The RAM storer is connected with bus interface, and the RAM storer is divided into two parts;

CAN transceiver and CAN interface, CAN transceiver junctor highway interface, the CAN interface links to each other with calibration facility;

Outer plate is selected the switching of two parts of signal wire control RAM storer.

2. CCP caliberating device among the ECU as claimed in claim 1 is characterized in that, described outer plate is selected signal wire conduct location line superlatively.