Hybrid Electric Vehicle (HEV) engine technology is an advanced power system that combines an internal combustion engine and an electric motor, aimed at improving fuel efficiency, reducing emissions, and providing better driving performance. Here are several key points of hybrid car engines:
1. Classification of hybrid systems:
Hybrid systems are mainly divided into three types: series connected (SHEV), parallel connected (PHEV), and hybrid electric vehicle (HEV). Series hybrid vehicles mainly rely on electric motors to drive, with internal combustion engines serving as generators to charge batteries; Parallel hybrid vehicles can be driven separately or simultaneously by internal combustion engines or electric motors; The hybrid system combines the characteristics of the first two and can intelligently switch according to driving conditions.
2. P0-P4 motor architecture:
The motor layout of hybrid vehicles ranges from P0 to P4, each with its specific functions and advantages. P0 motor is located at the front end of the engine, P1 motor is directly connected to the crankshaft, P2 motor is located between the engine and the gearbox, P3 motor is located at the output end of the gearbox, and P4 motor is on a different axis from the engine and can directly drive the vehicle.
3. DHT hybrid technology:
DHT (Dedicated Hybrid Transmission) hybrid technology is a system that adopts a P1+P3 power structure, and the engine can achieve single or multi gear direct drive. For example, BYD's DM-i hybrid system is powered by a P1 motor and driven by a P3 motor, combined with a single speed direct drive of a 1.5L engine, to achieve multiple driving modes.
4. High efficiency internal combustion engine:
The internal combustion engine of hybrid vehicles usually adopts technologies such as Atkinson cycle to improve thermal efficiency, balance power output and fuel economy. For example, the Roewe D7 DMH World Champion Edition is equipped with a 1.5L hybrid dedicated engine that achieves a thermal efficiency of 43%.
5. Transmission system:
The transmission system of hybrid vehicles is also one of the key technologies, and many models use power dividers to replace traditional transmissions to improve efficiency. Some manufacturers are developing multi speed hybrid transmissions to strike a balance between weight, size, and efficiency.
6. Energy recovery:
During braking or downhill driving, hybrid vehicles convert energy back into electrical energy through a kinetic energy recovery system, which is stored in the battery to improve energy efficiency.
The development of hybrid car engine technology not only improves the performance and efficiency of cars, but also provides effective solutions for reducing environmental pollution and addressing energy crises. With the continuous advancement of technology, hybrid cars are expected to occupy a larger share in the future automotive market.
