CN107846419A - A kind of transmission method and system of vehicle motor OBD data - Google Patents

The invention provides a kind of transmission method of vehicle motor OBD data, for the technical problem for the OBD data for solving that Engine ECU can not be transmitted caused by different ECU uses different agreements.

A kind of transmission method and system of vehicle motor OBD data

Technical field

The present invention relates to vehicle OBD field of data transmission, more particularly, to a kind of biography of vehicle motor OBD data Transmission method and system.

Background technology

At present when transmitting OBD data, it is transmitted generally by ELM327 methods, this method is retrieved in order to be worked as The general several agreements of preceding in the market, then global broadcast request, which agreement vehicle, which replys, is just given tacit consent to and is carried out using the agreement Communication transfer OBD data, are decoded further according to ISO15031-5.

This method most vehicle can normal use, but due to the update of Some vehicles, its Tens internal ECU may use various protocols, such as, Engine ECU uses CAN protocol, and remaining ECU uses K Wire protocol, if using J1850->K->A kind of CAN order goes to retrieve this several agreement, then the Data Transport Protocol of vehicle K wire protocols will be identified as, lead to not the OBD data of request transmission Engine ECU.

The content of the invention

To solve, prior art is existing can not to transmit hair to the present invention caused by different ECU uses different agreements A kind of the defects of motivation ECU OBD data, there is provided transmission method of vehicle motor OBD data.

To realize above goal of the invention, the technical scheme of use is：

A kind of transmission method of vehicle motor OBD data, includes following steps：

S1. after vehicle launch, data application module initiates data transfer request to protocol identification control module；

S2. after protocol identification control module receives data transfer request, broadcast mode is enabled, in order to the ECU in vehicle Using to agreement scan for；Then the protocol type searched is transmitted to protocol-driven module；Protocol identification controls mould Block transmits data transfer request to protocol-driven module；

S3. i-th kind of agreement that data transfer request searches according to protocol identification control module is carried out group by protocol-driven module Bag, then by the data transfer after group bag to signaling conversion circuit, signaling conversion circuit is used to convert the data into corresponding electricity Ordinary mail number；I initial value is 1；

S4. level signal passes through the vehicle OBD oral instructions ECU that transport in vehicle, and ECU is received after level signal to vehicle OBD mouths Make corresponding return information；

S5. signaling conversion circuit transmits return information to protocol-driven module, protocol-driven module after receiving return information After carrying out data separating to return information, by the data transfer after separation to protocol identification control module, protocol identification control mould Root tuber judges whether return information is sent by Engine ECU according to the data after separation, if then the ECU is marked, And set point-to-point physical addressing request method and establish connection with Engine ECU, the connection for being then based on establishing is started The transmission of machine OBD data, after protocol identification control module receives engine OBD data, by engine OBD data transfers to number According to application module；If return information is not sent by Engine ECU, i=i+1 is made, then performs step S3, until i number Value is more than the quantity for the agreement that protocol identification control module searches.

Preferably, the protocol type includes CAN protocol, K wire protocols.

Preferably, the data application module, protocol identification control module, protocol-driven module are integrated in MCU.

Meanwhile present invention also offers a kind of system using above method, its specific scheme are as follows：Should including data With the ECU of module, protocol identification control module, protocol-driven module, signaling conversion circuit, vehicle OBD mouths and vehicle.

Compared with prior art, the beneficial effects of the invention are as follows：

1）The present invention by judging whether return information is that the data filtering by non-engine sent by Engine ECU falls, Simultaneously when judging return information is sent by Engine ECU, can by group wrap data transfer request protocol type come The OBD underlying protocols that present engine ECU is used are recognized accurately, so as to obtain complete engine OBD data.

2）The present invention uses broadcast request and point-to-point request method, first identifies all supports using broadcast request mode The vehicle ECU of OBD functions, after finding out Engine ECU, then point-to-point mode is switched to, is only communicated with Engine ECU, other Non- Engine ECU need not then send data respond request, alleviate the workload of non-engine, while it is total to also mitigate vehicle The load of line, reduce other systems interference and remind, request end decreases the filtering of data.

Brief description of the drawings

Fig. 1 is the structural representation of the part involved by method.

Embodiment

Accompanying drawing being given for example only property explanation, it is impossible to be interpreted as the limitation to this patent；

Below in conjunction with drawings and examples, the present invention is further elaborated.

Embodiment 1

As shown in figure 1, the method mentioned by the present invention is related to following part：Data application module, protocol identification control mould Block, protocol-driven module, signaling conversion circuit, the ECU of vehicle OBD mouths and vehicle.

Wherein, data application module, protocol identification control module, protocol-driven module are integrated in MCU, are changed with signal Circuit forms bus module together.

On the basis of more than, method provided by the present invention includes following steps：

S1. after vehicle launch, data application module initiates data transfer request to protocol identification control module；

S2. after protocol identification control module receives data transfer request, broadcast mode is enabled, in order to the ECU in vehicle Using to agreement scan for；Then the protocol type searched is transmitted to protocol-driven module；Protocol identification controls mould Block transmits data transfer request to protocol-driven module；

S3. i-th kind of agreement that data transfer request searches according to protocol identification control module is carried out group by protocol-driven module Bag, then by the data transfer after group bag to signaling conversion circuit, signaling conversion circuit is used to convert the data into corresponding electricity Ordinary mail number；I initial value is 1；

S4. level signal passes through the vehicle OBD oral instructions ECU that transport in vehicle, and ECU is received after level signal to vehicle OBD mouths Make corresponding return information；

S5. signaling conversion circuit transmits return information to protocol-driven module, protocol-driven module after receiving return information After carrying out data separating to return information, by the data transfer after separation to protocol identification control module, protocol identification control mould Root tuber judges whether return information is sent by Engine ECU according to the data after separation, if then the ECU is marked, And set point-to-point physical addressing request method and establish connection with Engine ECU, the connection for being then based on establishing is started The transmission of machine OBD data, after protocol identification control module receives engine OBD data, by engine OBD data transfers to number According to application module；If return information is not sent by Engine ECU, i=i+1 is made, then performs step S3, until i number Value is more than the quantity for the agreement that protocol identification control module searches.

Obviously, the above embodiment of the present invention is only intended to clearly illustrate example of the present invention, and is not pair The restriction of embodiments of the present invention.For those of ordinary skill in the field, may be used also on the basis of the above description To make other changes in different forms.There is no necessity and possibility to exhaust all the enbodiments.It is all this All any modification, equivalent and improvement made within the spirit and principle of invention etc., should be included in the claims in the present invention Protection domain within.

1. A kind of 1. transmission method of vehicle motor OBD data, it is characterised in that：Include following steps：

   S1. after vehicle launch, data application module initiates data transfer request to protocol identification control module；

   S2. after protocol identification control module receives data transfer request, broadcast mode is enabled, in order to the ECU in vehicle Using to agreement scan for；Then the protocol type searched is transmitted to protocol-driven module；Protocol identification controls mould Block transmits data transfer request to protocol-driven module；

   S3. i-th kind of agreement that data transfer request searches according to protocol identification control module is carried out group by protocol-driven module Bag, then by the data transfer after group bag to signaling conversion circuit, signaling conversion circuit is used to convert the data into corresponding electricity Ordinary mail number；I initial value is 1；

   S4. level signal passes through the vehicle OBD oral instructions ECU that transport in vehicle, and ECU is received after level signal to vehicle OBD mouths Make corresponding return information；

   S5. signaling conversion circuit transmits return information to protocol-driven module, protocol-driven module after receiving return information After carrying out data separating to return information, by the data transfer after separation to protocol identification control module, protocol identification control mould Root tuber judges whether return information is sent by Engine ECU according to the data after separation, if then the ECU is marked, And set point-to-point physical addressing request method and establish connection with Engine ECU, the connection for being then based on establishing is started The transmission of machine OBD data, after protocol identification control module receives engine OBD data, by engine OBD data transfers to number According to application module；If return information is not sent by Engine ECU, i=i+1 is made, then performs step S3, until i number Value is more than the quantity for the agreement that protocol identification control module searches.

2. 2. the transmission method of vehicle motor OBD data according to claim 1, it is characterised in that：The protocol type Including CAN protocol, K wire protocols.

3. 3. the transmission method of vehicle motor OBD data according to claim 1, it is characterised in that：The data application Module, protocol identification control module, protocol-driven module are integrated in MCU.

4. A kind of 4. system according to any one of claim 1 ~ 3 transmission method, it is characterised in that：Including data application mould Block, protocol identification control module, protocol-driven module, signaling conversion circuit, the ECU of vehicle OBD mouths and vehicle.