NiMH No. 7 battery

Electronic energy management system: NiMH No. 7 battery management and generator control

With the development of automobile technology, there are more and more on-board electronic facilities and entertainment facilities. These electronic systems have added pressure on vehicle energy. Under normal circumstances, 0.7 to 1.2L of gasoline is consumed for every 100km of driving with a power consumption of 1kW.

With the development of automobile technology, there are more and more on-board electronic facilities and entertainment facilities. On the one hand, these electronic systems have added pressure on vehicle energy. Under normal circumstances, 0.7 to 1.2L of gasoline is consumed for every 100km of driving with a power consumption of 1kW, and energy is facing an increasingly scarce situation; on the other hand, the failure of the car to start due to the collapse of the electronic system has become an important reason for the failure of starting.

At the same time, the number of cars is still increasing, and emission pollution has become one of the most concerned issues in the world. At present, Europe has issued regulations on limiting CO2 emissions. According to the regulations, from 2012 to 2015, the CO2 emissions of cars must be reduced from the current 160g/km to 120-125g/km. It is expected that by 2020, the CO2 emissions of automobiles will not exceed 95g/km. This regulation requires automobile manufacturers to consider reducing CO2 emissions when designing future cars, otherwise they will face high fines. Therefore, we are in urgent need of finding solutions to reduce CO2 emissions and save energy.

Bosch Automotive Electronics Division has been committed to the research and development and matching of electronic energy management systems. Bosch electronic energy management systems consist of battery sensors, controllable AC generators, and main control units with integrated electronic energy management software.

Battery status detection and charge and discharge optimization

The electronic energy management system can monitor the battery status in a timely manner through the battery status monitoring algorithm integrated in the battery sensor. Correspondingly, the battery and sensor working strategies can be set in the control system of the main control unit, and the battery working range can be set. According to the current battery charging status, battery temperature and vehicle driving conditions, the corresponding strategies can be used to control the generator. Charge the battery in time. During this process, the energy supply of the whole vehicle is in a completely closed-loop control state, thereby ensuring the energy supply of the whole vehicle, optimizing the energy management of the whole vehicle, ensuring the minimum current required for the engine to restart, and preventing the problem of the vehicle being unable to restart due to battery collapse.

Dynamic control of generator working voltage

At the same time, the electronic energy management system can also use the controllable AC generator to dynamically change the working voltage setting of the generator to optimize the engine torque distribution and the energy management of the whole vehicle.

Traditional generator control cannot utilize excess mechanical energy, and the working voltage is also uncontrollable. When the car is accelerating and requires higher torque, the traditional generator will still consume a large engine torque, and the electronic energy management system can adjust the torque demand of the generator by dynamically controlling the working voltage of the generator, and optimize the torque demand during the operation of the car. When the car is in an accelerating state, the system reduces the working voltage of the generator, thereby reducing the torque demand of the generator torque, so as to ensure that more energy is supplied to the car to accelerate. On the contrary, when the car is in a decelerating state, the generator voltage can be increased, so that the system can use the excess mechanical energy during deceleration to charge the battery.

Under normal battery charging and discharging conditions, if the sensor detects that the battery is undercharged, the main control unit will increase the generator working voltage accordingly, improve the charging efficiency of the generator, and charge quickly. When the battery is saturated, the generator voltage is lowered accordingly to make the generator idle to prevent unnecessary overcharging of the battery, thereby reducing the torque consumed. This can reduce fuel consumption and keep the charging state within a safe level range, ensure that the battery works in a benign range, and extend the battery life.

Conclusion

In summary, the electronic energy management system has improved the vehicle's starting performance to a certain extent, ensured the reliable supply of power in the vehicle, improved the reliability of the electronic system, reduced fuel consumption and reduced CO2 emissions, and is being increasingly used in the development of new vehicles. At present, Bosch is still continuing to further optimize and conduct new research on the electronic energy management system.

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