Design and mass production programming of automobile keyless control system

“Most electronics practitioners are not unfamiliar with the “watchdog”, which is a technical means to prevent computer programs from entering an endless loop and jumping out of the loop. This article will show you a different car “watchdog” in the traditional sense. Let’s take a look at the design and mass production programming of the car’s keyless control system.

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Abstract: Most electronics practitioners are not unfamiliar with the “watchdog”, which is a technical means to prevent computer programs from entering an endless loop and jumping out of the loop. This article will show you a different car “watchdog” in the traditional sense. “Dog”, take a look at the design and mass production programming of the car’s keyless control system.

From the perspective of the global automobile market, the overall industry has maintained a growth trend since 2005. Automobile sales have increased from 65,957,600 in 2005 to 89,678,800 in 2015, with a compound annual growth rate of 3.12%. With the increase in the number of vehicles, the anti-theft technology of automobiles has received widespread attention. The details will be introduced below.

The development of automobile anti-theft system has mainly gone through three stages: traditional mechanical key system, remote key system and keyless intelligent system.

1. Traditional mechanical key system

This method achieves the purpose of anti-theft through the mechanical principle. Turning the key to open the door, turning the key to start a fire, has low technology content, insufficient anti-theft performance, and key information is easy to be copied. This method is rarely used alone now.

Figure 1 Automobile mechanical key

2. Remote control key system

The remote control key system is an upgrade of the traditional mechanical key system. It uses radio frequency technology to remotely control the door opening and locking of the car. Compared with the traditional mechanical key, the remote control key must be double-identified by the key and the chip to start the car. It has high technological content. , The characteristics of sufficient security performance, and the chip has various software and hardware encryption matching algorithms, which increases the difficulty of system cracking.

Figure 2 Car remote key

3. Keyless Intelligent System

At present, many car models are equipped with a keyless system. The keyless system is an intelligent system that automatically locks and opens the door. When the car owner leaves the car, the sensor in the car cannot sense the presence of the key, and it will automatically lock the door. When the car is in the locked state, it will continuously send out signals. When the smart key appears within the signal range, it will There is a response, complete the check action.

The intelligent system can not only be used for car lock, but also intelligent actions such as turning on the air conditioner in advance, bringing us a more comfortable car experience. The emergence of car keyless intelligent systems not only facilitates car owners, but also improves car safety performance.

Figure 3 Automobile keyless control system

Through the above introduction, do you feel that the keyless control system is very tall? So what powerful chip is used to design this technologically-sense product? Please see the specific breakdown below.

The PCF79xx series of chips are products launched by NXP semiconductor manufacturers around the field of car anti-theft, and promote the car anti-theft system to a more advanced stage. The chip has extremely low power consumption to ensure the endurance of the system. The internal integration of UHF transmitter and LF frequency transceiver chip, has a variety of software and hardware encryption algorithms, such as Hitag2, Hitag2-E, Hitag-AES, etc., to ensure data Security of communication. And a 32-bit unique identification code (ID) is solidified internally, and the encryption algorithm is bound to the ID, so as to achieve the effect that cannot be cracked. As shown in the figure below, it is the chip ID information read by the P800 programmer.

Faced with the rapidly growing automobile market, the safety of automobiles has attracted widespread attention from the society, and the demand for anti-theft systems is also increasing. In order to meet the needs of the market, ZLG Zhiyuan Electronics has launched the P800 ISP online programmer, which can burn PCF79xx series chips in batches, which solves the problem of batch demand for smart keys.