CN201075011Y - Whole electric intelligent instrument system of vehicle - Google Patents

Abstract

The utility model relates to an automobile instrument, in particular to the automobile instrument which adopts an embedded single chip microcomputer, a liquid crystal display and has intelligent function. The utility model adopts an advanced power autonomous control, a backup battery system, an energy control strategy, a high-speed multifunctional CPU, the liquid crystal display, a real-time clock, environmental temperature detection, a fuzzy data coupling technology and a CAN bus, so as to develop a full-electronic intelligent instrument system with the high reliability and long service life. The system can provide more information and strong expansion, and further uses the CAN bus to transfer signals and data, so as to reduce the wiring of the whole automobile.

Description

Automobile full electronic intelligent instrument system

technical field

The utility model relates to an automobile instrument, in particular to an automobile electronic intelligent instrument system.

Background technique

The car instrument is an important device to indicate the car's working condition information and help the driver to drive the car safely and rationally. Traditional automotive instruments use mechanical pointers to indicate the value, but due to the complex working conditions of the car, the vibration of the pointer will cause multi-valued readings; and there are many defects in the reliability and life of the mechanical device; especially the commonly used Mechanical speed detection, frequent occurrence of flexible shaft failures lead to indication failure. In addition, the current car combination instrument can only display the basic operating parameters of the vehicle, but cannot monitor the running state of the car, and cannot further analyze these parameters in order to judge the running state of the car.

At present, the public literature reports the research of some automotive electronic instruments, and some propose a method of using single-chip microcomputer technology and VFD display devices to form an automotive electronic smart instrument. , oil level, total mileage, sub-mileage and other vehicle condition parameters, so that the car has a "black box" function; some use CAN bus technology, combined with single-chip microcomputer technology, to improve the car instrument. For example: Wang Junbo and Zou Jijun from the School of Electronics and Mechanical Engineering of East China Institute of Technology studied the design of USB bus and CAN bus protocol converters in the third issue of "Journal of East China Institute of Technology" in 2006, pointing out that field bus (Field bus) is the The real-time control communication network interconnecting the underlying field controller and field intelligent instrumentation equipment in the automatic control system is the product of the combination of 5C (Computer, Control, Communication, CRT, Change) technologies. CAN (Control Area Network) bus is a kind of field bus, which is widely used in automobile industry, machinery industry, household appliances, sensors and other fields. It has formed an international standard and is recognized as one of the most promising field buses. A scheme to realize the communication between field bus CAN and computer (server) through computer USB interface is proposed. Specifically introduces the hardware circuit design method and local software writing method realized by using the USB bus interface chip CH372 and the independent CAN controller SJA1000, and gives the flow of the main program modules; Chen Xiaozhong from the School of Automotive and Transportation Engineering of Jiangsu University proposed A design idea based on CAN bus and realizing the automobile instrument by software is presented. The car meter uses software to display data on the LCD screen, fully utilizes the advantages of the car bus, and uses the CAN bus to transmit the data collected from each sensor, which is convenient to connect with other control units, and can realize the upgrade and expansion of the car meter at any time. The test system is composed of liquid crystal display, PC-CAN interface card, single chip microcomputer, CAN controller (SJA1000), CAN bus transmission/reception driver (PCA82C250) and various data acquisition systems. The PC-CAN interface card uses CAN232 intelligent CAN interface card, which is suitable for the small flow data transmission application of CAN-bus, with a data transmission rate of up to 500 frames per second, and provides extensive and powerful software support. Supports design in development environments such as VC++, C++Builder, Delphi, and VB; this research has only one CAN node, so the data displayed on the monitor is only the speed, oil pressure, water temperature, and fuel consumption (doctoral research thesis); Li Wei , Hong Yunfu, and Sheng Yizhi studied the application of CAN bus technology in an automobile instrument system with Motorola 16-bit microcontroller MC9S12 as the central controller in the articles published on the Internet, and the overall structure of the system and the hardware and software design of the CAN communication module Described in detail.

However, the stability of the computer used in the automotive electronic instruments introduced in the current public literature or the speed of the single-chip microcomputer cannot meet the requirements of the car, and there are not many car working condition information and intelligent functions, such as intelligent alarm systems, intelligent lighting control, and driving. The fuel consumption per 100 kilometers, etc., especially the expansion function is not much.

Contents of the invention

In order to overcome the disadvantages of the existing automobile instrument system as described in the background technology, the utility model provides an automobile instrument control system with an intelligent function using an embedded single-chip microcomputer and a liquid crystal display.

The technical scheme that the utility model solves its technical problem adopts is:

This automotive all-electronic intelligent instrument system includes power supply, display, single-chip microcomputer, CAN controller, CAN bus sending and receiving driver and monitoring system. CAN bus controller, power supply is equipped with autonomous control and energy consumption monitoring system, CAN bus controller is embedded with fuzzy data coupling technology ARM microprocessor system, CAN controller is an integrated multi-channel CAN bus controller, power supply and energy consumption monitoring system Connected to the ARM system, the front section of the ARM system has keyboard and detection module input, the rear section of the ARM system is connected to the output of the LCD display and the CAN bus, and the CAN bus is respectively connected to the sensors of tires, engine, water tank, fuel tank, battery and lights; The wiring goes back to the speedometer, odometer, engine tachometer, water temperature gauge, fuel gauge, voltmeter, ammeter and lights and detection module.

In the above-mentioned automotive electronic instrument system, the speedometer adopts a disc digital graphic display that conforms to driving habits, the ambient temperature, water temperature, fuel quantity, and battery voltage adopt a bar-shaped cursor display, and the mileage and stroke adopt a digital display.

The automotive electronic instrument system mentioned above uses the power supply autonomous control function and energy control strategy. And charge the backup battery that interferes with the system, and the energy control strategy shuts down the inactive modules in a timely manner, which can save energy. The system uses an independent chip that monitors the power system to automatically restart the system when the power is disturbed.

In the above-mentioned automotive electronic instrument system, the system is equipped with an automatic light controller according to the driving environment.

The above-mentioned automotive electronic instrument system is equipped with a self-checking function switch capable of detecting system operation and an alarm with abnormal sound and display.

The above-mentioned automotive electronic instrument system is equipped with a digital display capable of detecting and displaying the fuel consumption per 100 kilometers when the driver drives the car.

The operation of the present utility model and the structure and function that each part adopts are given below:

1. Power on and off: Power on and off is controlled by the control signal of the user key.

2. Independent control of power supply: the work of the system is not completely controlled by the user's key control signal, but is controlled by the system's independent choice. The introduction of the autonomous control function lies in the shutdown of the system to realize the controllability of the system and ensure the effective storage of system data. Autonomous control is only used in the core CPU, the display system does not need this function.

3. Multi-level filtering and multi-level voltage stabilization: The electronic environment of the car is very harsh. In order to ensure the stable operation of the system, the power supply system uses multi-level filtering and voltage stabilization to prevent the interference of excessive ripple and multiple systems and ensure the core system. The voltage is stable.

4. Backup battery system: Due to the "pond effect" of the battery, the backup battery system first implements a powerful filtering and voltage stabilization system. At the same time, using this system can reduce the interference of the car's ignition and charging on the system.

5. Energy control: The energy control strategy shuts down inactive modules in a timely manner to save energy.

6. Power supply monitoring: The system uses an independent chip to monitor the power supply system, so as to shut down the system when the power supply is unstable, and automatically resume the operation of the system after the power supply is stable.

7. CPU: The system adopts Philips military-grade embedded system controller. The chip is a 32-bit CPU based on ARM7TDMI-S, with 256kB of Flash and 16kB of RAM. It has multiple AD and multiple CAN control bus controllers. The CPU has good stability and anti-interference, and can work at -40°C ~ +125°C, fully meeting the requirements of automotive control.

8. Running speed: Cpu uses 11.0592MHz crystal oscillator, which can be accelerated to a speed close to 60M. At the same time, the ARM series controller is a pipelined instruction system with RISC structure, so the instruction execution speed is basically close to the running speed of the clock.

9. IO of the system: the controller used in the system has 144 pins, and has a variety of flexible serial and parallel communication buses for storage, display, communication, and detection, and has more than 70 common IOs for signal detection and function control There are also general-purpose AD interfaces, CAN bus interfaces, etc., which have wide applicability.

10. Display: The system uses a general-purpose liquid crystal display module, which can not only provide a high-brightness display interface, but also quickly display the vehicle speed, engine speed, oil quantity, water temperature, time, ambient temperature, battery voltage, Charge and discharge, system status, headlights, turn signals, etc.

11. Clock: The system uses a real-time clock to display the current time for the user.

12. Ambient temperature: The system uses an I2C bus temperature detection chip to detect the current ambient temperature in real time and with high precision.

13. CAN bus: the chip used by the system has a can controller. The CAN module provides standard and unified signal and data transmission for the door detection of the system.

14. System self-inspection and maintenance: the system maintenance module provides self-inspection, maintenance and other operations for the system.

15. Fuzzy data coupling technology: The system uses fuzzy data coupling technology to process data.

The utility model has the advantages of:

1. The utility model is compared with the open literature, and its technical characteristics are: the instrument system comprehensively applies ARM technology and CAN bus technology, the hardware uses the embedded system as the central controller, and adopts the CAN bus technology simultaneously; it has encryption and anti-rewriting functions and has State detection function; the power system adopts autonomous control, multi-level filtering, multi-level voltage stabilization, energy control and power control and other functions, as well as a backup battery system that can reduce the interference of vehicle ignition and charging on the system. Due to the application of modern digital signal detection technology, microelectronics technology and computer technology to develop an all-electronic intelligent vehicle condition information display system, it overcomes many defects of the traditional vehicle instrument system and improves the reliability of vehicle condition information indication. Secondly, using the powerful functions of the microprocessor, it can provide richer vehicle working condition information and intelligent functions, such as intelligent alarm system, intelligent lighting control, fuel consumption per 100 kilometers of driving, etc., and has strong reliability. Scalability, the function can be continuously expanded according to the needs. Therefore, the utility model can improve the intelligence level of the automobile instrument system, further improve the integration intelligence of the automobile operating condition information display system, help the driver to drive more safely and rationally, improve the driving safety of the automobile, and improve the technical level and product quality of my country's automobile electronics. Levels are facilitative.

2. The system is composed of all electronics, which has the characteristics of high reliability and long life, can provide more information, and has strong expandability.

3. The CAN bus is used to transmit signals and data, reducing the wiring of the whole vehicle.

Description of drawings

Fig. 1 Hardware block diagram of automotive all-electronic intelligent instrumentation system.

Figure 2 is the schematic diagram of the main circuit of the instrument.

Figure 3 is the system monitoring block diagram of the automotive all-electronic intelligent instrumentation system.

Figure 4 is a block diagram of the water temperature detection of the automotive all-electronic intelligent instrumentation system.

Figure 5 is a block diagram of the fuel quantity detection system of the automotive all-electronic intelligent instrumentation system.

Figure 6 The speed detection frame of the automotive all-electronic intelligent instrument system.

Detailed ways

As shown in Figure 1, the CAN bus controller of the all-electronic intelligent instrument system of the present utility model is embedded in the ARM microprocessor system of fuzzy data coupling technology, the CAN controller is a multi-channel CAN bus controller, and the power input is connected to the ARM system. The front section of the ARM system has keyboard and detection module input, and the output of the rear section of the ARM system is connected to the LCD display and CAN bus.

As shown in Figure 2, the all-electronic intelligent instrument system of the present utility model is mainly composed of six modules: CPU module (CPU.SCH), liquid crystal display module (LCD.SCH), power supply module (PWR.SCH), key module (KEBOARD.SCH), CAN bus interface module (CAN.SCH) and detection module (CHK.SCH). In the figure, the rhomboid symbol indicates the connection between the modules, that is, the line labels with the same name in different modules will be connected together when designing the printed board diagram with PROTEL; six modules correspond to six circuit schematic diagrams designed with PROTEL .

As shown in Figure 3, the CAN bus is respectively connected to tires, engine, water tank, fuel tank, battery, and lights; and there are lines connected to speedometer, odometer, engine tachometer, water temperature gauge, fuel gauge, Voltmeter and lamp and detection module. It can process and monitor the data of engine failure, engine oil pressure, brake fluid, and storage battery; and receive alarms to give safety reminders.

As shown in Figure 4, if the system controls the water temperature, the CAN bus line is connected to the water tank, the temperature of the water tank is detected through the sensor, the data is sent back, and the water temperature display and alarm are connected to give a safety reminder.

As shown in Figure 5, if the system controls the oil temperature, the CAN bus line is connected to the fuel tank, the temperature of the fuel tank is detected through the sensor, the data is sent back, and the oil temperature display and alarm are connected to give a safety reminder.

As shown in Figure 6, if the system controls the speed of the vehicle, the CAN bus has a line connected to the wheel, the speed is detected by the sensor, the data is sent back, and the speed display and the alarm are connected to make a safety reminder.

Claims (6)

1. An automotive all-electronic intelligent instrumentation system, including a power supply, a display, an interface card, a single-chip microcomputer, a CAN controller, a CAN bus transmission and receiving driver, and a monitoring system. Its characteristics are: the system adopts an embedded system controller, and has Multi-channel AD and multi-channel CAN bus controllers, the power supply is equipped with an autonomous control and energy consumption monitoring system, the CAN bus controller is embedded with an ARM microprocessor system with fuzzy data coupling technology, the CAN controller is a multi-channel CAN bus controller, and the power supply And the energy consumption monitoring system is connected to the ARM system. The front part of the ARM system has keyboard and detection module input, and the rear part of the ARM system is connected to the LCD output and the CAN bus. The CAN bus is respectively connected to the tires, engine, water tank, fuel tank, battery and lights. ;The sensors of tires, engine, water tank, fuel tank, storage battery and lights are wired back to speedometer, odometer, engine tachometer, water temperature gauge, fuel gauge, voltmeter, ammeter and detection module. 2. The automotive electronic instrument system according to claim 1, characterized in that: the speedometer adopts a disc digital display that conforms to driving habits, the ambient temperature, water temperature, fuel quantity, current, and battery voltage adopt a bar-shaped cursor display, and the mileage and itinerary adopt a digital display. 3. The automotive electronic instrument system according to claim 1, characterized in that: the power supply part adopts modules with functions such as autonomous control, multi-stage filtering and multi-stage voltage stabilization, energy control, power supply control, etc. The backup battery that interferes with the system, the energy control strategy shuts down the inactive modules in a timely manner, and an independent monitoring power supply system is installed, which can automatically restart the system chip. 4. The automotive electronic instrument system according to claim 1, characterized in that: the system is equipped with an automatic light controller according to the driving environment. 5. The automotive electronic instrument system according to claim 1, characterized in that: the system is equipped with a self-checking function switch capable of detecting system operation and an alarm for abnormal state sound and display. 6. The automotive electronic instrument system according to claim 1, characterized in that: the system is equipped with a digital display capable of detecting and displaying the fuel consumption per 100 kilometers when the driver drives the car.

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