JP2017211861A - Driving control device for vehicle lan actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driving control device that comprises a microcontroller 101 and a LIN driver 102 by a LIN communication system, effectively uses a parallel port inside the microcontroller at the time of transmission, and enables communication using a simple circuit by devising control software.SOLUTION: When a microcontroller 101 transmits data to a LIN transceiver 102, all transmission data to a Sync Break/Sync Field/ID Field/Data Field/Check Sum at the LIN transmission time is transmitted via a parallel port of a microcontroller IC by setting two software timers, which are a software timer defining time between bits inside the Fields and a software timer defining time between the Fields.SELECTED DRAWING: Figure 1

Description

The present invention is applied to a communication circuit based on a LIN (Local Interconnect Network) communication protocol, which is one of in-vehicle LAN (Local Area Network), which has recently been adopted in an actuator driving system for vehicle air conditioning, and has a simpler circuit structure. This is a technology for efficient communication.

The LIN communication protocol includes SYNC-FIELD, whereby the master baud rate is transmitted to the slave, and the slave receives data at this baud rate. There is a need to realize this communication processing with a simpler circuit configuration.

JP 2004-139319 A

However, in the communication system composed of the microcontroller IC and the LIN driver IC as shown in Patent Document 1, the LIN Sync Break signal length is 13 bits when transmitting from the serial port output terminal (UART1) inside the microcontroller IC. As a result, there is a problem that processing cannot be realized with an asynchronous serial port (it cannot be controlled only with serial port interrupt processing), and control is provided by providing a Sync Break generation circuit that switches between the parallel port and serial port of the microcontroller IC. The idea of was necessary. FIG. 3 is a time chart showing the processing of the message frame of the LIN communication protocol used in Patent Document 1. Sync Break = 13 Bit length is processed by the parallel port P1, and Sync Field / ID Field / Data Field / Check Sum is processed. = 8Bit length is processed by serial port UART1. This method has a problem that the drive control apparatus becomes complicated and the mounting software of the microcontroller IC becomes complicated.

Accordingly, an object of the present invention is to provide a control system that can realize a drive control device for an in-vehicle LAN actuator with a minimum circuit configuration by taking advantage of the LIN Sync Break signal.

In order to achieve the above object, the present invention provides a LIN drive control apparatus 100 that performs serial communication with a LAN actuator using a message frame based on a LIN communication protocol. The control apparatus includes at least a microcontroller IC101 and a LIN transceiver IC102. The IC 101 has a first parallel port that transmits to the LIN transceiver IC 102, and the LIN transmission control is performed via the RC6 parallel port of the microcontroller IC 101. After the port initialization of the microcontroller IC 101, the LIN transmission data in 1-bit units. Is obtained from the transmission buffer, set in RC6, and processed without distinguishing all transmission data up to Sync Break / Sync Field / ID Field / Data Field / Check Sum. FIG. 2 is a time chart showing message frame processing of the LIN communication protocol showing the features of the present invention.

By using such control software, a drive control device for controlling the in-vehicle LAN actuator can be realized with a minimum circuit configuration.
Specifically, there are the following three advantages.
(1) Since the drive circuit can be realized by the circuit configuration of only the microcontroller IC 101 and the transceiver IC 102, the device can be configured with a simple circuit configuration as compared with the conventional drive control device.
(2) Since the parallel port control is adopted for the transmission of the LIN signal, the apparatus can be configured with simpler control software as compared with the drive control apparatus of the conventional control method.
(3) Since only the microcontroller IC 101 and the transceiver IC 102 are configured, the device can be manufactured, repaired, and maintained in a short time compared to a conventional drive control device.

The block diagram of the LIN communication control system in 1st Embodiment of this invention. The time chart which shows the message frame process of the LIN communication protocol in 1st Embodiment of this invention. The time chart which shows the process of the message frame of the LIN communication protocol used by the prior art (patent document 1). The flowchart at the time of LIN transmission in 1st Embodiment of this invention. The transmission data of the LIN transmission buffer in 1st Embodiment of this invention. The LIN data software timer set value in the first embodiment of the present invention.

Hereinafter, an embodiment of a LIN communication control apparatus 100 according to the present invention will be described with reference to FIG. This device has a microcontroller IC101, a voltage conversion circuit 106 that supplies + 5V power to the microcontroller IC101, a power supply circuit 107 that converts AC100V power to DC13V, a LIN transceiver 102, and a PBR position that displays the PBR (position sensor) value of the actuator. The display unit 103 includes a START / STOP SW 104 and an ACT operation position setting unit 105. The slave side is a LAN actuator 200 having a LIN DC motor control IC (communication & motor drive) 201 and a DC actuator 202 inside.

The LAN actuator 200 for air conditioning control is an actuator having a PBR (position detection sensor) and incorporates a DC motor 202 and a LIN controller 201. In addition to the LIN BUS signal, the air-conditioning LAN actuator is supplied with power for driving the motor from the +13 V output of the DC +13 V power circuit and the GND terminal.

The parallel port RC6 of the microcontroller IC101 is connected to the input terminal TXD of the LIN transceiver IC102, and the parallel / serial port RC7 of the microcontroller IC101 is connected to the output terminal RXD of the LIN transceiver IC102.

The output signal of the LIN transceiver IC 102 is connected to the BUS line of the controller 201 built in the LAN actuator 200 through the LIN BUS line.

Transmission data from the microcontroller 101 is transmitted through the parallel port RC6 of the microcontroller IC101, and reception data is received at the parallel / serial port RC7.

A series of control procedures relating to the operation of the microcontroller IC 101 to the LIN transceiver IC 102 and the LAN actuator 200 will be described below.

First, an instruction signal from the START / STOP SW 104 built in the LIN communication control device 100 and the operation position setting means 105 is input to the microcontroller IC 101, and arithmetic processing is performed by the built-in ROM to generate a control signal. The communication method is set so that the baud rate is 1920 bps and the transmission / reception format length is 8 bits by a program written in advance in the ROM.

The microcontroller IC 101 stops the output of the RC6 port before the start of message frame transmission. At the start of message frame transmission, the microcontroller IC 101 starts sync break / sync field / ID field / from the parallel port of the microcontroller IC 101 according to the time chart of FIG. Send all transmission data up to Data Field / Check Sum. Since this signal is processed by the parallel port RC6, it can be transmitted regardless of the data length 13 bits / data length 8 bits.

The LIN transceiver IC 102 acquires the data from the input terminal TXD, performs signal level conversion, and transmits it to the LIN DC motor control IC 201 with a built-in LAN actuator.

The LIN DC motor control IC 201 receives the control signal, and sends the control signal to the motor driver in the IC so as to reach the rotation direction of the motor and the designated position according to the control signal.

The drive signal causes the motor built in the DC actuator 202 to rotate in the CW or CCW direction, and the rotational force is decelerated by several gear trains and transmitted to the output gear. The output stage gear is provided with a PBR (position sensor), and an output shaft position signal is fed back to the LIN DC motor control IC 201 in accordance with the rotation angle of the output stage gear.

When the PBR (position sensor) value reaches the target position, the LIN DC MOTOR control IC 201 stops the motor driver drive signal and returns stop and stop position information to the LIN transceiver IC 102.

The LIN transceiver 102 receives the LIN signal, performs level conversion, and outputs the signal from the output terminal RXD to the port RC7 of the microcontroller 101.

The microcontroller IC 101 confirms the end of control of the above signal in the built-in ROM, the series of control procedures is completed, sends a signal to the PBR position display means 103, and displays the current position.

Next, until a command signal from the START / STOP SW 104 and the operation position setting means 105 built in the LIN communication control device 100 is issued, a control signal related to the operation is not transmitted, and the monitoring signal of the LAN actuator is repeatedly transmitted and received.

Next, a signal processing method will be described using a flowchart. FIG. 4 is a flowchart at the time of LIN transmission in the first embodiment of the present invention.

In this embodiment, PIC16F877A is used for the microcontroller IC101. First, transmission processing is started in step S101.

In step S102, the port of the microcontroller 101 is initialized, and the RC6 port is set as a parallel port.

Next, the process proceeds to step 103, where transmission data is acquired from the LIN transmission buffer. FIG. 5 is a specific example of transmission data in the LIN transmission buffer SD [], and all transmission data up to Sync Break / Sync Field / ID Field / Data Field / Check Sum is acquired.

Next, the process proceeds to step 104, where the acquired data is transmitted from the parallel port RC6 of the microcontroller IC100 to the LIN transceiver IC102.

Next, the routine proceeds to step 105, where a software timer between bits of LIN transmission data is started. FIG. 6 shows a timer setting value between each bit of the LIN transmission data at a LIN transmission data communication speed of 19,200 bits / sec, which is set to 48 μsec. After the specified timer time elapses, the process proceeds to the next step 106.

In step 106, the pointer increment of the LIN transmission buffer is performed.

Next, the process proceeds to step 107, where field data transmission end confirmation is performed. If the field data transmission is not completed, the process returns to step 103 and the above operation is repeated.
When the end of the field transmission data can be confirmed, the LIN transmission process ends.

Next, the process proceeds to step 108, and a software timer between each LIN transmission data field is started. FIG. 6 shows a timer setting value between each field of LIN transmission data at a LIN transmission data communication speed of 19,200 bits / sec, which is set to 92 μsec. After the specified timer time has elapsed, the process proceeds to the next step 109.

In step 109, the end of transmission of the LIN transmission data is confirmed. If the transmission of the LIN transmission data has not ended, the process returns to step 103 and the above operation is repeated. When it is confirmed that the transmission of the LIN transmission data is completed, the transmission of the LIN transmission data is completed, and the process proceeds to the next step.

In step 110, the LIN transmission process ends.

The reception method is not applicable to the present invention, and the description of the operation is omitted.

As described above, according to the present invention, LIN transmission / reception can be performed with only the configuration of the microcontroller IC 101 and the transceiver IC 102 without adding a circuit for adding a sync break signal processing parallel port as in the prior art. it can.

Although the embodiments of the present invention have been described above, various alternatives, modifications, and variations can be made by those skilled in the art based on the above description, and the present invention is not limited to the various alternatives described above without departing from the spirit of the present invention. It includes modifications or variations. Moreover, although PIC16F877A was used as the above-mentioned microcontroller, it is not limited to this. Furthermore, the present technology is not limited to the DC motor type of LAN actuator, and can be applied to a LAN actuator using a stepping motor. Moreover, although the embodiment of the present invention is a control device, the present control method can also be used for in-vehicle master controller control.

The LIN (Local Interconnect Network) communication protocol is a protocol that is expected to be widely used for vehicle body system control (for example, air conditioning motor control, wipers, rearview mirrors, power windows, etc.). Efficient communication with a simpler circuit structure This control method that can perform is effective.

100 LIN communication control device 101 Microcontroller IC
102 LIN transceiver IC
103 PBR position display means 104 START / STOP SW
105 Operating position setting means 106 + 13V → + 5V conversion circuit 107 AC100V → DC13V conversion circuit 108 Connector 200 LAN actuator 201 LIN DC motor control IC
202 DC actuator
203 Connector

Claims (2)

From a microcontroller to a transceiver in a drive controller for a vehicle LAN actuator that is composed of a circuit having at least a microcontroller and a LIN transceiver and performs LIN BUS communication with an external LAN actuator using message frame transmission / reception signals according to the LIN communication protocol The parallel port of the microcontroller is used for transmission of the LIN BUS control signal, 13-bit sync break signal, and 8-bit sync field / ID field / data field / check sum signal by controlling the control software of the microcontroller IC. A drive control device characterized by the above. From a microcontroller to a transceiver in a drive controller for a vehicle LAN actuator that is composed of a circuit having at least a microcontroller and a LIN transceiver and performs LIN BUS communication with an external LAN actuator using message frame transmission / reception signals according to the LIN communication protocol When using the parallel port of the microcontroller for transmission, and executing the 13-bit sync break signal of the LIN BUS control signal and the 8-bit sync field / ID field / data field / check sum signal by software control of the microcontroller IC, A drive control apparatus comprising: a software timer for defining a time between each bit in the field and a software timer for defining a time between each field.

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