Briefly describe the safety of car electronic control

In recent years, with the application of electronic technology, computer technology and information technology, automotive electronic control technology has developed rapidly, especially in many aspects such as control accuracy, control range, intelligence and networking. Automotive electronic control technology has become an important indicator of the development level of modern vehicles.

The automotive electronic control system consists essentially of sensors, electronic controllers (ECUs), drives and control program software, and is used in conjunction with the mechanical system on the vehicle (usually integrated with the subsystems in the powertrain, undercarriage and body systems). And use cables or radio waves to transmit information to each other, so-called "electromechanical integration", such as electronic fuel injection system, anti-lock brake control system, anti-skid control system, electronic control suspension system, electronically controlled automatic transmission, electronic power steering Wait. The automotive electronic control system can be roughly divided into four parts: engine electronic control system, chassis integrated control system, body electronic safety system, and information communication system. Among them, the first two systems are directly related to the driving performance of the car.

Since the electric vehicle market began to heat up in 2012, electric vehicles have become a road vehicle. The driving environment is complex and varied, and the range of work load and speed varies greatly, and space is limited. The performance requirements of the motor controller are strict, and the safety and reliability requirements are high. How to judge the security of a controller? Today, Xiaobian will talk about the security of the controller.

The safety performance of the controller can be divided into two parts: “inside” and “outside”. The first is “outside”. In summer, many typhoons and rainy seasons are prone to internal hesitation. These require the controller to have certain waterproof capability. Xinlianda controller protection The grade reaches IP-65, which can completely prevent dust from entering and withstand the water sprayed from the nozzle in any direction. The shell has a flame retardant design and is tested strictly according to the standard of GB/T18488.1-2006. The shell is 30cm & TImes; 30cm area Both can withstand 100kg of high-strength extrusion, and the vibration test is carried out in accordance with the national standard GB/T2423, which meets the standard.

Xinlianda controller in the national testing center inspection map

After saying "outside", the "inside" of the controller is more important. In the case of AC asynchronous controllers, the unique vector control technology (patent), when a vehicle fails during driving, the ordinary controller will immediately stop operating, which is very dangerous for vehicles in the traffic flow. When one of the Xinlianda controllers fails, the other two phases can continue to be powered on, and the vehicle can slowly drive to the roadside safety zone until the motor turns to zero to stop working. Moreover, when some of the controllable electronic switches in the controller are damaged, the controller will switch to the undamaged controllable electronic switch module (patent) to make the controller operate normally, which greatly increases the safety of the controller. In terms of permanent magnet synchronization, the unique anti-lock circuit patent eliminates the permanent magnet motor in the drive IGBT is broken while the motor is in high-speed operation, the permanent magnet input terminal short circuit generates excessive power generation braking current, resulting in The problem of personal injury, and solves the problem of over-current and over-voltage charging of the supercapacitor battery or the power battery caused by the over-voltage phenomenon of the permanent magnet motor during the high-speed downhill process, which causes the system capacitance to be damaged or the fuse to be blown.