CN110794804B

CN110794804B - System, ECU, motor vehicle and method for flashing ECU

Info

Publication number: CN110794804B
Application number: CN201910913963.3A
Authority: CN
Inventors: 刘小强; 杨英振; 刘晓波; 赵光亮; 丛聪
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2019-09-25
Filing date: 2019-09-25
Publication date: 2021-02-23
Anticipated expiration: 2039-09-25
Also published as: CN110794804A

Abstract

The invention relates to the field of vehicle control systems, in particular to a system, an ECU, a motor vehicle and a method for flashing the ECU. The system for flashing the ECU according to the invention comprises: and the mode switching circuit is respectively connected with the flash mode switching pin of the MCU and the mode switching pin of the monitoring chip and is used for switching the modes of the MCU and/or the monitoring chip. The mode of MCU and/or monitoring chip is changed through the mode switching circuit, and the ECU is swiped and written, so that the operation is simple, the ECU swiping and writing system which can not be interrupted in the swiping and writing process is stable, and the risk that the controller cannot be swiped and written when the Bootloader is stuck can be effectively reduced. The mode switching circuit can effectively reduce electrostatic damage or mechanical damage in a forced writing mode. The monitoring circuit for forced flashing, the MCU and the related configuration of the JTAG level are completed on the same circuit plug-in unit, the control is convenient and reliable, the connector resource is saved, and the cost is saved in the aspect of connector type selection.

Description

System, ECU, motor vehicle and method for flashing ECU

Technical Field

The present application relates to the field of vehicle control systems, and more particularly to a system, an ECU, a motor vehicle, and a method for flashing an ECU.

Background

An Electronic Control Unit (ECU) of a vehicle generally includes a Micro Controller Unit (MCU) and a monitoring chip (Monitor).

In general, a program is flashed to the MCU through a single chip flash boot program (Bootloader). The program CAN also be written to the single chip via a Controller Area Network (CAN) line. However, when Bootloader is jammed and cannot be used, which causes a flash failure and needs to be flashed into Bootloader, the MCU needs to be modified in hardware and be flashed through the CAN, but this method is complicated to operate. And when the CAN is used for flashing the MCU, the situation that a dog is not fed occurs in the flashing process, so that reset output of the monitoring chip is pulled down, the MCU is reset, and the flashing is interrupted.

In view of the foregoing, it is desirable to provide a system, an ECU, a motor vehicle, and a method for flashing an ECU, which are capable of performing a flash operation on an MCU with simple operation and without interruption during the flash process.

Disclosure of Invention

To solve the above problems, the present application proposes a system, an ECU, a motor vehicle, and a method for flashing an ECU.

In one aspect, the present application provides a system for flashing an ECU, comprising:

and the mode switching circuit is respectively connected with the flash mode switching pin of the MCU and the mode switching pin of the monitoring chip and is used for switching the modes of the MCU and/or the monitoring chip.

Further, the system for flashing an ECU as described above, the mode switching circuit includes: the circuit comprises a first access end, a second access end, a first resistor, a second resistor, a first diode, a second diode and a NOT gate;

one end of the first resistor is connected with the first access end, the input end of the NOT gate and the MCU respectively, and the other end of the first resistor is connected with the power supply;

one end of the second resistor is connected with the output end of the first diode, the output end of the second diode and the monitoring chip respectively, and the other end of the second resistor is grounded;

the output end of the NOT gate is connected with the input end of the first diode;

and the input end of the second diode is connected with the second access end.

Further, the system for flashing an ECU as described above, the mode switching circuit, in particular,

when the first access end is not grounded and the second access end is not accessed to the debugger, controlling the monitoring chip to enter a mass production mode and controlling the MCU to enter a Bootloader flash mode;

when the first access end is not grounded and the second access end is accessed to a debugger, controlling the monitoring chip to enter a debugging mode and controlling the MCU to enter a Bootloader flash mode;

when the first access end is grounded and the second access end is not accessed to the debugger, controlling the monitoring chip to enter a debugging mode and controlling the MCU to enter a CAN flash mode;

when the first access end is grounded and the second access end is accessed to the debugger, the monitoring chip is controlled to enter a debugging mode, and the MCU is controlled to enter a CAN flash mode.

In a second aspect, the present application provides an ECU, including an MCU, a monitoring chip, and the system for flashing the ECU;

and the MCU is connected with the monitoring chip.

In a third aspect, the present application provides a motor vehicle comprising the ECU.

In a fourth aspect, the present application provides a method for flashing an ECU, comprising the steps of:

the first access end of the mode switching circuit is not grounded, and the second access end is not accessed to the debugger;

the mode switching circuit outputs a high level to the MCU and outputs a low level to the control monitoring chip;

the monitoring chip enters a mass production mode, and the MCU enters a Bootloader flash mode.

In a fifth aspect, the present application provides a method for flashing an ECU, comprising the steps of:

the first access end of the mode switching circuit is not grounded, and the second access end is accessed to the debugger;

the mode switching circuit outputs a high level to the MCU and outputs the high level to the control monitoring chip;

the monitoring chip enters a debugging mode, and the MCU enters a Bootloader flashing mode.

In a sixth aspect, the present application provides a method for flashing an ECU, comprising the steps of:

the first access end of the mode switching circuit is grounded, and the second access end is not accessed to the debugger;

the mode switching circuit outputs a low level to the MCU and outputs a high level to the control monitoring chip;

the monitoring chip enters a debugging mode, and the MCU enters a CAN flash mode.

In a seventh aspect, the present application provides a method for flashing an ECU, including the steps of:

the first access end of the mode switching circuit is grounded, and the second access end is accessed into the debugger;

the mode switching circuit outputs a low level to the MCU and outputs the low level to the control monitoring chip;

The application has the advantages that: the mode of the MCU and/or the monitoring chip is changed through the mode switching circuit, the ECU is subjected to flash, the operation is simple, the flash of the ECU cannot be interrupted in the flash process, and the flash process is stable.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to denote like parts throughout the drawings. In the drawings:

FIG. 1 is a schematic diagram of a system for flashing an ECU as provided herein;

FIG. 2 is a schematic circuit diagram of a system for flashing an ECU provided herein;

FIG. 3 is a schematic step diagram illustrating normal operation of a method for flashing an ECU provided herein;

FIG. 4 is a schematic diagram illustrating steps in a debugger connection of a method for flashing an ECU provided herein;

FIG. 5 is a schematic diagram illustrating a step of grounding a first access terminal of a method for flashing an ECU provided herein;

FIG. 6 is a schematic diagram illustrating a step of grounding a first access terminal and connecting a debugger of a method for flashing an ECU provided by the present application; .

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

According to an embodiment of the present application, there is provided a system for flashing an ECU, as shown in fig. 1, including:

As shown in fig. 2, the mode switching circuit includes: the circuit comprises a first access terminal, a second access terminal, a first resistor (R1), a second resistor (R2), a first diode (D1), a second diode (D2) and a NOT gate;

one end of the second resistor is respectively connected with the output end of the first diode, the output end of the second diode and the monitoring chip, and the other end of the second resistor is grounded;

and the input end of the second diode is connected with the second access end.

The mode switching circuit is particularly useful for,

The ECU comprises an MCU and a monitoring chip. Flashing the ECU means flashing the MCU in the ECU.

Because hardware configuration pins exist in a plurality of MCUs (single chip microcomputers), the switching of the MCU flashing mode can be realized through the high and low levels of the hardware configuration pins.

Taking an english-flying single chip microcomputer TC277 as an example, as shown in table 1, when hardware configuration pins HWCFG3 and HWCFG4 are configured as 11, the program is written to the single chip microcomputer through Bootloader. When the configuration is 00, the flashing mode is switched to force the MCU to be flashed by receiving signals through the CAN transceiver. The common configuration is 11, when Bootloader jamming occurs and cannot be used, so that the flash failure is caused, the pins HWCFG3 and HWCFG4 need to be configured to be 00, and MCU needs to be flashed through CAN.

TABLE 1

When the situation that the dog is not fed occurs in the flash process, reset output of the monitoring chip is pulled down, the single chip microcomputer is reset, and flash is interrupted. An external control signal is needed, so that the monitoring chip ignores the problem of dog feeding in the flashing process.

Taking the TLF35584 chip from english-flying as an example, the 35584 chip has two modes, a mass production mode and a flash mode. As shown in Table 1, in the mass production mode, the watchdog always works normally, and in the flash mode, the reset output of the 35584 chip is not pulled down due to the problem of dog feeding by the singlechip. The mode switching is controlled by the high and low levels of a pin MPS on the 35584 chip, wherein the MPS is in the high mode and in the flash mode, and the MPS is in the low mode and in the mass production mode.

"feeding dogs" refers to emptying watchdog (industrial watchdog) counters. The watchdog is a monitoring device arranged for preventing the program from accidents, the count value of the watchdog counter is continuously increased as long as the watchdog function is opened, and when the program runs normally, the watchdog counter needs to be emptied before reaching the maximum value (namely within the maximum counting time of the watchdog) so as to restart counting, namely, the watchdog is a feeding dog. If the program runs away, perhaps takes place unexpected situation, and make "feed the dog" operation and can not normally go on, the watchdog counter can constantly increase, until overflowing, then the singlechip resets to avoid the singlechip to run away after flying out of control and lead to the crash.

According to the embodiment of the application, the pin level of the MCU flashing mode is changed and controlled by using the mode switching circuit, and the pin level of the monitoring chip mode is changed and controlled, so that the flashing mode of the MCU and the mode of the monitoring chip are changed, the mode of the monitoring chip can be changed together with the flashing mode of the MCU, and the flashing interruption is prevented.

Next, embodiments of examples of the present application will be further described with reference to fig. 2 and table 2. Fig. 2 is a schematic circuit diagram according to an embodiment of the present application. The output of the point A is pulled up to 5V and is connected to an HWCFG pin of the singlechip, the level of the point B is inverted for the level of the point A, and the level of the point B is obtained or obtained with the level signal of the second input end to obtain the level of a point C, namely the level which is input to a MPS pin of the monitoring chip. The point B and the second input terminal pass through the diode when being input to the point C, which is pulled down to the ground through R2 and has a default level of 0, to prevent the levels from interfering with each other. And the JTAG is a debugger, and the second access end is used for accessing the debugger. The first access end is a connector pin of the ECU. The logic relationship between the C point level and the A point and the JTAG level is

As shown in table 2, when the ECU normally operates, the connector (first access terminal) connected to point a is suspended without input, and since the input level of the HWCFG is 1 due to the pull-up to 5V, the flash mode of the single chip microcomputer is Bootloader flash. The level of the point B is 0, so the MPS input is 0, the mode of the monitoring chip is a mass production mode, and the ECU writes by brushing normally.

TABLE 2

As shown in table 2, after the debugger is plugged, the input of the second access terminal becomes 1, the output of the point a and the point B is unchanged, the level of the point C becomes 1, the MPS becomes 1, the flash mode of the single chip microcomputer is Bootloader flash, the mode of the monitoring chip becomes the debug mode, and the flash of the single chip microcomputer can be performed through the debugger.

As shown in table 2, when the first access terminal is grounded, the voltage at point a is 0, so HWCFG is 0, the one-chip microcomputer flash mode is changed to the CAN forced flash mode, and since the level at point B is inverted from the level at point a, the output at point B is 1, the input at the MPS pin is 1, and the mode of the monitor chip is the debug mode. At the moment, the single chip microcomputer flashing mode is changed into the CAN forced flashing mode, and the mode of the monitoring chip is the debugging mode, so that the problem that the flashing interruption is caused by the fact that the reset output of the monitoring chip is pulled down and the single chip microcomputer is reset CAN be solved.

As shown in table 2, if the debugger is connected, the input level of the second access terminal becomes 1, and the level at point A, B, C is unchanged, the single chip microcomputer flash mode is still the CAN forced flash mode, and the monitoring chip is still in the debugging mode. If the Bootloader flash mode is required to be recovered, the first access end is only required to be suspended (ungrounded).

In a second aspect, the present application provides an ECU, including an MCU, a monitoring chip, and a system for flashing the ECU;

the MCU is connected with the monitoring chip.

In a third aspect, the present application provides a motor vehicle.

The motor vehicle in the embodiment of the present application is provided with an ECU mounted with a system for flashing the ECU.

In a fourth aspect, the present application provides a method for flashing an ECU, as shown in fig. 3, comprising the steps of:

s101, a first access end of a mode switching circuit is not grounded, and a second access end of the mode switching circuit is not accessed to a debugger;

s102, the mode switching circuit outputs a high level to the MCU and outputs a low level to the control monitoring chip;

s103, the monitoring chip enters a mass production mode, and the MCU enters a Bootloader flash mode.

In a fifth aspect, the present application provides a method for flashing an ECU, as shown in fig. 4, comprising the steps of:

s201, a first access end of a mode switching circuit is not grounded, and a second access end of the mode switching circuit is accessed to a debugger;

s202, the mode switching circuit outputs a high level to the MCU and outputs the high level to the control monitoring chip;

s203, the monitoring chip enters a debugging mode, and the MCU enters a Bootloader flashing mode.

In a sixth aspect, the present application provides a method for flashing an ECU, as shown in fig. 5, comprising the steps of:

s301, a first access end of the mode switching circuit is grounded, and a second access end of the mode switching circuit is not accessed to a debugger;

s302, the mode switching circuit outputs a low level to the MCU and outputs a high level to the control monitoring chip;

s303, the monitoring chip enters a debugging mode, and the MCU enters a CAN flash mode.

In a seventh aspect, the present application provides a method for flashing an ECU, as shown in fig. 6, including the following steps:

s401, a first access end of the mode switching circuit is grounded, and a second access end of the mode switching circuit is accessed to a debugger;

s402, the mode switching circuit outputs a low level to the MCU and outputs the low level to the control monitoring chip;

s403, the monitoring chip enters a debugging mode, and the MCU enters a CAN flash mode.

In the embodiment of this application, change the mode of MCU and/or monitor chip through the mode switching circuit, write by brush ECU, easy operation to can not interrupt ECU's write by brush in the write by brush process, the write by brush process is stable, is a feasible scheme of write by brush ECU, can effectively reduce the risk that leads to the controller can't write by brush when Bootloader card dies. When the ECU is off-line, a debugging port is required to be connected with a program for brushing, then the debugging port is detached, then an enclosure is sealed, and in the process of welding and detaching the debugging port, electrostatic damage or mechanical damage is easily introduced, and the damage can be effectively reduced by a forced brushing mode. Besides, the monitoring circuit for forced flashing, the MCU and the related configuration of the JTAG level are completed on the same circuit plug-in (first access end), the control is convenient and reliable, the connector resource is saved, and the cost is saved in the connector selection, so that the practical significance is realized.

The above description is only for the preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A system for flashing an ECU, comprising:

the mode switching circuit is respectively connected with a flash mode switching pin of the MCU and a mode switching pin of the monitoring chip and is used for switching the modes of the MCU and/or the monitoring chip;

the mode switching circuit includes: the circuit comprises a first access end, a second access end, a first resistor, a second resistor, a first diode, a second diode and a NOT gate;

and the input end of the second diode is connected with the second access end.

2. The system for flashing an ECU as recited in claim 1, wherein the mode switching circuit, in particular,

3. An ECU comprising an MCU, a monitoring chip and the system for flashing an ECU of any one of claims 1 to 2;

and the MCU is connected with the monitoring chip.

4. A motor vehicle comprising the ECU of claim 3.

5. A method for flashing an ECU using the system of claim 1, comprising the steps of:

6. A method for flashing an ECU using the system of claim 1, comprising the steps of:

7. A method for flashing an ECU using the system of claim 1, comprising the steps of:

8. A method for flashing an ECU using the system of claim 1, comprising the steps of: