CN104176002A - Method and system for detecting whether modules of vehicle are replaced or not - Google Patents

Abstract

The invention relates to a method of detecting whether a vehicle module has been replaced. The method includes: the main control unit of the vehicle automatically generates a random code during factory matching, sends it to the detected module and stores it in each detected module; activates the detection function when the vehicle starts to use; the main control unit periodically sends a random code The code is given to the detected module, and the detected module judges whether the random code stored by itself is consistent with the random code currently received from the main control unit. The method for detecting whether a vehicle module is replaced according to the present invention can detect whether a module in the vehicle is replaced and whether there is a potential theft.

Description

A method and system for detecting whether a vehicle module is replaced

technical field

The invention relates to a vehicle detection technology, in particular to a technology capable of detecting whether a main module in a vehicle has been replaced.

Background technique

ECU (Electronic Control Unit) electronic control unit, also known as "driving computer", "vehicle computer" and so on. In terms of use, it is a special microcomputer controller for automobiles. Like an ordinary computer, it consists of a microprocessor (CPU), a memory (ROM, RAM, EEPROM), an input/output interface (I/O), an analog-to-digital converter (A/D), and shaping and driving. Composition of integrated circuits. To use a simple sentence to describe it is "ECU is the brain of the car".

At present, in some mid-to-high-end cars, ECU is not only applied to the engine, but also can be found in many other places. For example, ABS anti-lock braking system, electronically controlled automatic transmission system, active suspension system, SRS airbag system, multi-directional adjustable electronically controlled seat system, and entertainment system are all equipped with their own ECUs.

In addition, with the improvement of electronic automation of cars, there will be more and more ECUs, and the circuits will become more and more complicated. In order to simplify the circuit and reduce the cost, a technology called multiplexing communication network is used for the information transmission between multiple ECUs in the car, and the ECUs of the whole vehicle form a network system, which is "CAN-BUS". (controller area network-bus) data bus.

It can be seen that the ECU has become an important constituent unit of a car, so it has naturally become one of the main targets of thieves. At present, the main control parts of cars are often stolen on the market and flow into the black market, causing car owners or OEMs to a certain extent. property loss.

the

Contents of the invention

In view of the above problems, the present invention aims to provide a method and system for detecting whether a vehicle module has been replaced, which can detect whether a vehicle module has been replaced, or whether there is potential vehicle theft.

The method for detecting whether a vehicle module is replaced in the present invention is to use the main control unit of the vehicle to detect whether a plurality of detected modules are replaced, and it is characterized in that it includes:

In the factory matching step, the main control unit of the vehicle automatically generates a random code during factory matching, sends it to the detected module and stores it in each detected module;

The function activation step is to activate the detection function when the vehicle starts to be used;

In the detection and verification step, the main control unit periodically sends a random code to the detected module, and the detected module judges whether the random code stored by itself is consistent with the random code currently received from the main control unit.

Preferably, in the detection and checking step, when the detected module judges that the random codes stored by itself are all consistent with the random codes received from the main control unit, the vehicle is allowed to work normally.

Preferably, in the detecting and checking step, when at least N detected modules judge that the random codes stored by themselves are inconsistent with the random codes received from the main control unit, the vehicle is not allowed to work normally.

Preferably, in the detection and checking step, when at least N detected modules judge that the random codes stored by themselves are inconsistent with the random codes received from the main control unit, while the vehicle is not allowed to work normally, the The detected module itself that makes the random code inconsistency judged to be inconsistency does not work.

Preferably, in the detection and verification step, the N is 2.

Preferably, in the function activating step, the detection function is activated by first setting the ignition switch of the vehicle to the ACC gear.

Preferably, in the detection and verification step, the main control unit sends a random code to the detected module at a period of 100 ms.

Preferably, in the factory matching step, the main control unit of the vehicle automatically generates a random code during factory matching, sends the random code through the CAN bus, and each detected module automatically receives the random code.

The system for detecting whether a vehicle module is replaced according to the present invention is characterized in that it includes:

The main control unit is used to automatically generate a random code during factory matching and send it to the detected module described below, and periodically send the random code to the detected module described below when the user starts to use the vehicle; and

A plurality of detected modules are used to store the random code sent from the main control unit when the factory is matched, and are used to judge whether the random code stored by itself is the same as the random code sent from the main control unit when the user starts using the vehicle. The random code received by the main control unit is consistent.

Preferably, the main control unit and the plurality of detected modules perform information transmission through a CAN bus.

According to the method and system for detecting whether a vehicle module has been replaced according to the present invention, whether there is a module in the vehicle is replaced or whether there is a vehicle theft, when the relevant module in the vehicle is replaced, the vehicle cannot be started In this way, the safety hazard caused by the random modification of the vehicle is avoided.

the

Description of drawings

FIG. 1 is a flow chart of the method for detecting whether a vehicle module is replaced according to the present invention.

FIG. 2 is a schematic diagram showing the factory matching step S101 in the method for detecting whether a vehicle module is replaced according to the present invention.

FIG. 3 is a schematic diagram showing the detection and checking step S103 in the method for detecting whether a vehicle module has been replaced according to the present invention.

Detailed ways

Introduced below are some of the various embodiments of the invention, intended to provide a basic understanding of the invention. It is not intended to identify key or critical elements of the invention or to delineate the scope of protection.

The present invention mainly detects whether a module is replaced, whether there is a potential vehicle theft, and if there is such a potential danger, the vehicle is not allowed to start.

The method for detecting whether a vehicle module is replaced according to the present invention will be described below with reference to FIGS. 1 to 3 .

FIG. 1 is a flow chart of the method for detecting whether a vehicle module is replaced according to the present invention.

The method for detecting whether a vehicle module is replaced in the present invention is a method for detecting whether a plurality of detected modules are replaced by a main control unit of the vehicle. Here, the detected modules may be, for example, multiple ECUs in the vehicle.

As shown in Figure 1, main method of the present invention comprises the following steps:

Factory matching step S101: When the main control unit of the vehicle is matched in the OEM factory, a series of random codes are automatically generated, and these random codes are sent out through the CAN bus, and each detected module automatically receives the random codes, and stores the received random codes in in its own memory. FIG. 2 is a schematic diagram showing the factory matching step S101 in the method for detecting whether a vehicle module is replaced according to the present invention. As shown in Figure 2, the main control unit generates random codes during OEM factory matching, and these random codes are respectively received by ECU1-ECU2 as each detection module through the CAN bus and stored in their own EEPROM.

In the function activation step S102, the detection function is activated when the vehicle starts to be used. Here, as an implementation of the activation detection function, when the user starts to use the vehicle, the ignition switch is first set to the ACC gear, and the function detection is activated. The ACC gear is the power gear of the car, which is generally controlled by the car key and supplies power to some devices such as audio and lighting. Before the car is started, if the key is placed in the ACC gear, some devices that do not consume much electricity, such as stereos, radios, cigarette lighters, etc., will be powered on (and the car has not started at this time). That is, in this embodiment of the present invention, the detection function is activated by judging whether the vehicle is in the ACC gear before the vehicle is started.

Detection and verification step S103: After the detection function is activated, the main control unit periodically sends a random code to the detected module, and the detected module judges whether the random code stored by itself is consistent with the random code currently received from the main control unit. FIG. 3 is a schematic diagram showing step S103 of factory inspection and checking in the method for detecting whether a vehicle module has been replaced according to the present invention. As shown in Figure 3, after the detection function is activated, the main control unit periodically sends random codes to the detected module ("receive" direction in Figure 3), and the detected module judges whether the random code stored by itself is consistent with the current data from the main control unit. The random code received by the control unit is consistent and the judgment result is returned to the main control unit (direction of "response" in Figure 3).

Specifically, the main control unit periodically sends the random code to the CAN network. Here, the sending cycle can be determined according to the actual situation, for example, it is set to 100ms. ECU1, ECU2...ECUn receives the random code from the CAN network and checks it with the stored random code. If it is the same, it will send a positive response, and if it is not the same, it will send a negative response. ECU1, ECU2... ECUn are shown in Figure 3 as the same response pattern.

Further, when the main control unit receives more than N negative responses, the main control unit disables the starting signal of the starter, thereby making the vehicle unable to start. Here, for example, N can be set as 2, so that when the main control unit receives more than 2 negative responses, the signal for starting the starter will not work.

Moreover, when ECU1, ECU2...ECUn checks and finds that the random codes are different, it also makes some functions of itself not work. For example, it can make the instrument always on, the entertainment system cannot be used normally, the wiper cannot work, the engine cannot run, etc.

Specifically, a few examples are given to illustrate: if ECU1 is the electronic control unit of the entertainment system, it can be set to prohibit the entertainment system from making sound; if ECU2 is the electronic control unit of the engine, it can be set to not allow fuel injection and ignition ; If ECU3 is the electronic control unit of the instrument, it can be set to keep it on.

On the other hand, if all the responses are affirmative after checking, the vehicle is working normally.

According to the method for detecting whether a vehicle module has been replaced in the present invention, when a relevant module in the vehicle is replaced, the vehicle cannot be started, thus avoiding potential safety hazards caused by random refitting of the vehicle.

Next, the system for detecting whether a vehicle module has been replaced according to the present invention will be briefly described. The system for detecting whether a vehicle module is replaced according to the present invention includes: a main control unit, which is used to automatically generate a random code during factory matching and send it to the following detected modules, and the user

Periodically send random codes to the following detected modules when starting to use the vehicle; and a plurality of detected modules for storing random codes sent from the main control unit during factory matching, and for When using the vehicle, it is judged whether the random code stored by itself is consistent with the random code received from the main control unit when the user starts to use the vehicle. Here, the main control unit and the plurality of detected modules transmit information through the CAN bus, and the detected modules are multiple ECUs in the vehicle.

The above examples mainly illustrate the method for detecting whether a vehicle module is replaced and the system for detecting whether a vehicle module is replaced according to the present invention. Although only some specific embodiments of the present invention have been described, those skilled in the art should understand that the present invention can be implemented in many other forms without departing from the spirit and scope thereof. The examples and embodiments shown are therefore to be regarded as illustrative and not restrictive, and the invention may cover various modifications without departing from the spirit and scope of the invention as defined in the appended claims with replace. the

Claims (10)

1. A method for detecting whether a vehicle module is replaced is to utilize the main control unit of the vehicle to detect whether a plurality of detected modules are replaced, it is characterized in that, comprising: In the factory matching step, the main control unit of the vehicle automatically generates a random code during factory matching, sends it to the detected module and stores it in each detected module; The function activation step is to activate the detection function when the vehicle starts to be used; In the detection and verification step, the main control unit periodically sends a random code to the detected module, and the detected module judges whether the random code stored by itself is consistent with the random code currently received from the main control unit. 2. The method for detecting whether a vehicle module is replaced as claimed in claim 1, wherein: In the detection and checking step, when the detected module judges that the random codes stored by itself are all consistent with the random codes received from the main control unit, the vehicle is allowed to work normally. 3. The method for detecting whether a vehicle module is replaced as claimed in claim 1, wherein: In the detection and checking step, when at least N detected modules judge that the random codes stored by themselves are inconsistent with the random codes received from the main control unit, the vehicle is not allowed to work normally. 4. The method for detecting whether a vehicle module is replaced as claimed in claim 3, wherein: In the detection and checking step, when at least N detected modules judge that the random codes stored by themselves are not consistent with the random codes received from the main control unit, the random codes are not allowed to work normally while the vehicle is not allowed to work normally. The inconsistency is judged as the inconsistency detected module itself does not work. 5. The method for detecting whether a vehicle module is replaced as claimed in claim 4, wherein: In the detecting and checking step, the N is 2. 6. The method for detecting whether a vehicle module is replaced according to any one of claims 1 to 5, wherein: In the function activating step, the detection function is activated by first setting the ignition switch of the vehicle to the ACC gear. 7. The method for detecting whether a vehicle module is replaced as claimed in claim 6, wherein: In the detection and verification step, the main control unit sends a random code to the detected module at a period of 100 ms. 8. The method for detecting whether a vehicle module is replaced as claimed in claim 7, wherein: In the factory matching step, the main control unit of the vehicle automatically generates a random code during factory matching, sends the random code through the CAN bus, and each detected module automatically receives the random code. 9. A system for detecting whether a vehicle module has been replaced, comprising: The main control unit is used to automatically generate a random code during factory matching and send it to the detected module described below, and periodically send the random code to the detected module described below when the user starts to use the vehicle; and A plurality of detected modules are used to store the random code sent from the main control unit when the factory is matched, and are used to judge whether the random code stored by itself is the same as the random code sent from the main control unit when the user starts using the vehicle. The random code received by the main control unit is consistent. 10. The system for detecting whether a vehicle module is replaced as claimed in claim 9, wherein: The main control unit and the plurality of detected modules perform information transmission through a CAN bus.