With the rise of concepts such as 5G and Internet of Vehicles, functions such as vehicle ADAS and in-vehicle entertainment are gradually becoming the standard equipment of the new generation of smart cars, and multi-sensor fusion and large-screen and large-screen vehicle software and hardware systems undoubtedly need more On-board memory. Because they are distributed in various types of vehicle-mounted terminals and hardware systems, these memories are the core carriers of data content such as images, videos, and even voice, and their usage and data storage characteristics are often very different, or frequently Data erasing or writing requires a longer cycle life or requires extremely high reliability. Therefore, if you want to successfully enter the vehicle storage market, there is almost no complete solution, and the market segments whose uniqueness can meet the storage needs of specific application scenarios have attracted attention.
This article takes the core technology of new energy vehicles VCU (Vehicle Control Unit) as an example. The VCU is the core of the entire control system. It collects the motor and battery status, accelerator pedal signal, brake pedal signal and other actuator sensor controller signals, comprehensively analyzes and judges the driver’s driving intention, and controls the lower parts of the controller. The actions are monitored. Its main responsibility is to be responsible for the normal driving of the car, braking energy feedback and energy management of the vehicle engine and power battery, network management and fault diagnosis and processing, vehicle status monitoring, etc., to ensure that the vehicle is in good power and high economy Normal and stable work under the conditions of sex and reliability is the soul of the car.
Application of FRAM in vehicle control unit VCU
The VCU system needs to record the current state of the car and the transmission gear, acceleration, braking and output torque when a fault occurs at a speed of once per second. Using FRAM technology, it can be stored and read through simple software. At the same time, it ensures high speed and reliability. Fujitsu launched the automotive standard product MB85RS2MLY in May of this year. Its read and write times can reach 10M, and the range is -40°C to +125°C. It is very suitable for applications that require real-time data recording (for example, daily recording for 10 consecutive years). 0.1 second of data, the number of writes will exceed 3 billion), with extremely high data write stability and reliability. Fujitsu distributors provide technical support such as product solutions.
Automotive standard FRAM is the best memory choice to meet automotive electronics reliability and no delay requirements
For BMS (Battery Management System), another core technology of new energy vehicles, these characteristics are equally important. The battery management system needs to record and store data in real time, and its system will record important battery data (fault information, health status SOH, fuel gauge SOC, etc.) in real time and continuously at a frequency of every second or every 0.1 second, and monitor the short-term battery (The last few charging cycles are 60 times/sec) and long-term (the entire life of the battery) performance. For example, under normal circumstances, the power of the battery pack is maintained at 30%~75%, which means normal operation. If there is an imbalance, it needs to be supplemented from other battery packs. At this time, the system needs to detect and record the power, temperature, voltage, and current of the battery pack. Wait for the data, and the time for one monitoring and recording should not be too long.
By adopting FRAM technology, automakers can greatly reduce system complexity and improve data integrity. In fact, FRAM has been widely used in key electronic systems of new energy vehicles, such as airbag data storage (Airbag), accident data recorder (EDR), new energy vehicle CAN box (CAN-BOX), new energy vehicle terminal ( T-BOX), tire pressure monitoring (TPMS), car driving assistance system (ADAS) and navigation and infotainment system (infotainment).