Each car has at least one battery, it usually has two functions: start the engine; to the car's electrical installation power, such as power windows, car radio and so on. After the car engine starts, the engine will be through the generator to kinetic energy Sensor into electricity, and then charge the car battery to achieve this function. To meet both of these features, the car's battery needs to provide a stable 12-volt DC power supply. Battery work is abnormal, is the main reason for many automotive electrical failure, which with the engine-related issues may lead to a series of security risks. The mainstream trend of car development is more and more automotive electronic equipment and electronic applications, hybrid and pure electric vehicles gradually popular, which are directly lead to higher and higher car power load, increasing the pressure on the battery, requiring the work of the battery As much as possible to achieve real-time monitoring to analyze the possible causes of failure. Another market demand comes from climate change, the frequent occurrence of extreme weather so that the failure rate of car battery continues to rise.
With the new mission-critical needs (such as engine start and stop functions) more and more common, start-up demand and other requirements such as regenerative braking and intelligent alternator control are driving the sensor to more accurately detect the battery status to provide Early fault alarm. The smart battery management system continuously monitors battery performance, including battery charge status, battery life cycle status, and battery support status for various applications. Monitoring battery performance reduces the risk of vehicle downtime due to battery loss. This system is based Fuel Rail Pressure Sensor on a smart battery sensor that directly measures battery current, voltage and temperature. The measurement data is transferred to the battery monitoring operation program. BatMon calculates the battery status and informs the energy manager of the battery of energy, performance level and service life. This information can in turn be used to support the start-stop function. When the battery is detected near the critical state, prompt the driver to replace the battery.
In order to better support traditional and emerging battery chemicals for automotive and industrial applications, Freescale Semiconductor MM9Z1J638 battery sensor, it is the industry's first for the general market in line with the AEC-Q100 standard smart battery sensor. The sensor integrates four voltage detection channels, five temperature acquisition channels and one current acquisition channel, three analog-to-digital converters, a 16-bit MCU and CAN protocol module Temperature Sensor in a single package. The MM9Z1J638 battery sensor measures a number of key battery parameters to monitor battery health (SOH), charge status (SOC), and functional status (SOF) for early fault prediction. The flexible 4-channel voltage acquisition architecture supports traditional 12V lead-acid batteries and other emerging battery applications such as 14V stacked lithium batteries, high voltage junction boxes and 24V truck batteries.
MM9Z1J638 battery sensor integrates a 16-bit S12Z microcontroller with 128K flash memory, 8K RAM and 4K EEPROM, and a CAN protocol module, LIN interface and 3 analog-to-digital converter circuits, as compared to other solutions on the market , The sensor will be analog, processor and communication functions in one, help to reduce the cost of materials and the use of more advanced battery monitoring algorithm. And the use of industry-standard methods ABS Sensor were tested to meet the car market strict low defect rate requirements. In addition, its analog products are basically able to meet the key needs of the industrial market, for example, can run in a larger temperature range.