KR20110006980A

KR20110006980A - Congestion detection method for communication between main mcu and sub mcu

Info

Publication number: KR20110006980A
Application number: KR1020090064643A
Authority: KR
Inventors: 김현기
Original assignee: 엘지이노텍 주식회사
Priority date: 2009-07-15
Filing date: 2009-07-15
Publication date: 2011-01-21

Abstract

PURPOSE: A communication congestion detecting method between a main MCU and a sub MCU is provided to detect not only a not yet received signal at high precision and reliability in a communication between a main MCU module and a sub MCU module but also detect a transmission signal which could not be received in orders. CONSTITUTION: A sub MCU transmits a first data signal including a sequence information to a main MCU(S110). The main MCU checks a data receiving signal within a setting time(S120). If the first data signal is received within the setting time, a second data signal including the order information data corresponding to the next order is transmitted(S140). If the sub MCU receives a data signal including non-reception information or receives the second data signal within the setting time, communication congestion is determined(S160).

Description

Congestion detection method for communication between main MCU and sub MCU

The present invention relates to a congestion detection method of communication between a main MCU and a sub-MCU, and more particularly, to a congestion detection method of communication between a main MCU and a sub- MCU in an engine control unit (ECU).

Generally, a vehicle is provided with an engine control unit (ECU) for receiving electrical signals detected by various input sensors and outputting digital control signals for driving various actuators on the output side. The engine control unit (ECU) is an electronic control unit that controls the internal operation of the engine in a variety of ways. The simplest engine control unit (ECU) is used to control the fuel injection amount of the cylinder during the explosion of the SI engine. More complex engine control units (ECUs) in vehicles are used to control ignition timing, variable valve timing, booster levels controlled by turbochargers and other peripherals.

The MCU module (Micro Control Unit Module) in the engine control unit includes a main MCU module and a sub MCU module. In the communication between the main MCU module and the sub-MCU module, the abnormal state detection due to the congestion in which the signal stays in one place was determined as the abnormal state detection when the unreceived state of the signal was not received for a predetermined time, for example, 10 ms. In this case, there is a disadvantage in that an abnormal state such as simply detecting an unreceived signal as an abnormal state and a transmitted signal cannot be received in the order of transmission are not detected.

The present invention has a high precision and reliability in the communication between the main MCU module and the sub-MCU module, and between the main MCU and the sub-MCU that can detect congestion such as not receiving a signal but not receiving the signal in the order of transmission. A congestion detection method of communication is provided.

In one embodiment, a method of detecting congestion in communication between a main MCU and a sub- MCU may include transmitting a first data signal including order information data having an order information in a main microcontrol unit or a sub MCU. Checking whether a data signal has been received within a preset time by the MCU receiving the transmitted first data signal, or if the data signal is not received within the preset time by the MCU receiving the transmitted first data signal, Transmitting a data signal including signal unreceived information data with information indicating that a signal has not been received, and if the data is received within a set time, the order including the order information data corresponding to the next order of the order information data included in the first data signal; Transmitting a data signal, and the MCU transmitting the first data signal And if the data signal including the unreceived information data is not received or if the second data signal is not received within a set time, determining that there is a congestion of communication between the main MCU and the sub-MCU.

In the communication between the main MCU module and the sub-MCU module, it can detect not only the signal but also the congestion that the transmitted signal is not received in the order of transmission with high precision and reliability.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, and the same or corresponding components will be denoted by the same reference numerals regardless of the reference numerals and redundant description thereof will be omitted.

1 is a block diagram schematically illustrating a main MCU module and a sub MCU module in an engine control unit.

Referring to FIG. 1, the main MCU module 110 and the sub MCU module 130 in the engine control unit 100 transmit and receive real time data signals. Data signals transmitted from the main MCU module 110 should be received by the sub MCU module 130 in the order in which they were transmitted.

Here, the congestion is a state in which the data signal transmitted from one MCU module is not received from another MCU module in the order in which they are transmitted or the transmitted data signal is not received within a predetermined time, that is, a state in which the transmitted data signal is not normally received. Indicates.

In the present embodiment, when the data signal is transmitted from the main MCU module and the sub-MCU module using three-wire clock synchronous serial communication, congestion information data, which is data that can detect congestion using predetermined bits, is included. Here, it will be apparent to those skilled in the art that the communication environment may vary.

The congestion information data includes order information data indicating information on the order and signal non-receipt information data indicating information on the data not received. The congestion information data is a set byte, and may be included in an upper bit or a lower bit or another predetermined bit of data transmitted from the main MCU module or the sub MCU module. For example, such congestion information data may be allocated to 3 bytes, which is the most significant bit.

Table 1 shows the congestion information data according to the present embodiment.

Order information data

order data One 000B001B 2 001B010B 3 010B011B 4 011B100B 5 100B101B Signal not received information data 111B

2 is a flowchart illustrating a congestion detection method of communication between a main MCU module and a sub MCU module according to the present embodiment. Although a congestion detection method for starting data signal transmission from the sub MCU module to the main MCU module will be described, it will be apparent to those skilled in the art that the same applies to the case of starting data signal transmission from the main MCU module to the sub MCU module. . In addition, the data representing the sequence information data or the signal unreceived information data may vary in addition to Table 1.

Referring to FIG. 2, a data signal is transmitted from the sub MCU module to the main MCU module by including order information data in higher bits (S110). Then, the main MCU module determines whether a data signal is received within a set time (S120). The set time may vary, for example, 10 ms or 5 ms.

If data within the time set in the main MCU module is received (S120), the congestion information data of the upper bits of the received data signal is checked (S130). Then, the main MCU module transmits the data signal including the order information data corresponding to the next order of the received order information data (S140).

For example, if the sequence information data received from the sub MCU module is 000B001B, the main MCU module transmits a data signal including 001B010B, the sequence information data corresponding to the next sequence, and the sequence information data received from the sub MCU module is 001B010B. If the main MCU module transmits a data signal including 010B011B, the sequence information data corresponding to the next sequence, and if the sequence information data received from the sub-MCU module is 010B011B, the main MCU module 011B100B, the sequence information data corresponding to the next sequence. And transmits a data signal, and if the order information data received from the sub-MCU module is 011B100B, the main MCU module transmits the data signal including 100B101B, the order information data corresponding to the next order.

Therefore, the sub-MCU module transmits the data signal by sequentially including the order information data according to the order of Table 1, and the main MCU module includes the order information data corresponding to the next order of the order information data received from the sub-MCU module. To transmit the data signal.

Then, the sub-MCU module determines whether or not the order information data corresponding to the next order of the order information data included in the data signal transmitted by the sub-MCU module has been received from the main MCU module within the set time (S150). The sub-MCU module determines whether the order information data included in the data signal received from the main MCU module corresponds to the order of Table 1.

If the sub-MCU module does not receive the order information data corresponding to the next order of the order information data included in the data signal transmitted by the sub-MCU module within the set time, it determines that there is a congestion (S160). If the sequence information data corresponding to the sequence is received, it is determined that there is no congestion and the signal is normally transmitted and received. For example, if the sub-MCU module transmits a data signal including the order information data (000B001B) in the upper bits, and then includes the order information data (001B010B) in the upper bits of the data signal received from the main MCU module, You can judge that there is no runaway.

If the main MCU module does not receive the data signal in the set time from the sub-MCU module in S120, the main MCU module transmits a data signal including the signal unreceived information data 111B (S170). The sub MCU module may receive a data signal including the signal unreceived information data 111B (S180) and determine that data transmitted from the sub MCU module to the main MCU module has not been received by the main MCU module within a set time. That is, congestion can be detected.

All of the above functions may be performed by a processor such as a microprocessor, a controller, a microcontroller, an application specific integrated circuit (ASIC), or the like according to software or program code coded to perform the function. The design, development and implementation of the code will be apparent to those skilled in the art based on the description of the present invention.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention. You will understand. Therefore, it is not intended that the invention be limited to the above-described embodiments, but the present invention will include all embodiments within the scope of the following claims.

2 is a flowchart illustrating a congestion detection method of communication between a main MCU module and a sub MCU module according to the present embodiment.

Claims

Transmitting a first data signal including order information data having order information in a main microcontrol unit (MCU) or a sub MCU;

Checking whether a data signal is received within a set time at the MCU receiving the transmitted first data signal;

If a data signal is not received within a predetermined time in the MCU receiving the first data signal, the data signal including the signal unreceived information data having information that the data signal was not received within the set time is transmitted,

Transmitting a second data signal including order information data corresponding to a next order of order information data included in the first data signal if data is received within a predetermined time; And

Determining that there is a congestion of communication between the main MCU and the sub-MCU if the MCU which has transmitted the first data signal does not receive a data signal including the unreceived information data or does not receive the second data signal within a set time. Congestion detection method of communication between a main MCU and a sub- MCU containing.

The method of claim 1,

And the sequence information data or the signal unreceived information data is included in the most significant bit of the data.

The method of claim 1,

And the sequence information data or the signal unreceived information data are allocated in 3 bytes.

The method of claim 1,

And the main MCU and the sub MCU are located in an engine control unit.