In the past two years, the 48v light hybrid system has been promoted in benz level c, level s and in the bmw 5 and 7 new models. The official campaign called it “a smoother and more dynamic economy”, but there was much dissatisfaction in the forum with the feedback from the owner: “the light-gliding lights are frequently on” and “the replacement of batteries is expensive, almost equivalent to half a year's salary” ... Is the 48v light-mixing system really trustworthy? Are maintenance costs prohibitive? Today, we will look into this topic in depth to inform consumers who are ready to buy cars。
I. What's a 48v lightweight system? Why is mercedes fighting with the bmw
In short, the 48v light mix system is a small electric power and battery added to the conventional fuel vehicle to achieve a “micromix”。
Benz and bmw have been promoting the 48v light mixer system, based on two main considerations:
Responding to stringent emission regulations: emission standards in europe are becoming more stringent and the installation of light mix systems can rapidly reduce fuel consumption data
Improved driving experience: more quiet with low-speed driving and smoother automatic start-up systems, while providing power to equipment such as air conditioning。
Ii. Incidence of failure of mercedes and bmw 48v
Real user feedback: the failure rate, although not high, is proportional。
Common failure of the mercedes 48v light system:
Isg electrical failure (integrated start-up generator inside engine): light failure code, automatic start-up failure and heavy failure to start the vehicle, requiring a trailer. In particular, the old m254 engine model (e. G. Mercedes c) is a common problem with overheating and unstable voltage。
48v battery decay: after three years of use, the battery capacity is significantly reduced, it cannot be charged in serious cases, and the replacement of batteries is costly。
System software failure: the engine frequently hinted at “48v system failure”, but was restarted and disappeared, and only system upgrades were made to shop 4s to cure the symptoms。
Common failures of the bmw 48v light system:
Bsg power failure (belt moving generators): the bmw light mixer connects the engine through belts, with a higher risk of slippage or fracture of belts, resulting in the electrical power not working properly。
Battery management module failure: battery charge unusual, dashboard displaying "drive system failure", forcing the owner to call the trailer。
Start-up setbacks are exacerbated: when low-speed electrics come in, gearbox switching is a matter of logic and driving experience is less smooth than conventional fuel vehicles。
Conclusion: the failure rate of isg machines in mercedes is higher (higher maintenance costs), while the failure rate of bsg machines in bmw is relatively low。
Iii. The cost of maintenance is high! The replacement of the electric power is equivalent to the purchase of a pentagon
Maintenance costs for the mercedes 48v light mix system (in the case of level c):
The isg power plant was replaced: the material cost was $25,000 + $3,000 per hour, for a total of nearly $30,000。
(a) replacement of 48v lithium batteries: price quoted from 4s for 20,000 to 28,000 yuan (higher price difference between domestic and imported batteries)
Electrical control module: the cost of a separate replacement module is approximately $8,000, but 4s usually requires “replacement of the full system”。
Maintenance costs for bmw 48v light mixing systems (in five cases):
Bsg electrical replacement: material cost of $18,000 + working hours of $2,000, totaling approximately $20,000
48v battery replacement: 15,000 to 20,000 yuan
Belt + tighter: the cost of replacing belts alone is $2,000, but electrical failure usually combines damage belts with more than $10,000 for packing and repair。
The truth:
