Lin Changchun, on the circular test track, the Hongqi L5 concierge car, which represents the highest level manufactured by the Chinese automobile industry, is testing the performance of the engine on the vehicle.
In three consecutive tests, the car's acceleration from 100 kilometers has been maintained within 9 seconds-for a large car weighing more than four tons, this is already an astonishing number.
This Hongqi car is equipped with one of the most powerful car engines in the world-a V-shaped 12-cylinder engine. Each of the 12 cylinders arranged at an angle of 60 degrees can generate a powerful thrust of more than seven tons and can withstand combustion pressures of up to 130 atmospheres.
The extreme combustion brings a super power output of more than 300 kilowatts of power and 550 Nm of torque to the entire engine, which is enough to drive a heavy truck.
As an automotive engine engineer with more than 30 years of experience, Li Jincheng hopes to increase the power performance of the V12 engine by another 15% while ensuring energy saving and high efficiency. However, such a goal is extremely challenging.
Because the powerful power comes from efficient combustion, just to increase the thermal efficiency by 1%, a series of designs such as air intake, fuel injection, and combustion chamber shape need to be finely optimized and innovated.
The automobile engine is a reciprocating piston internal combustion engine. Air and gasoline are mixed in a certain proportion, ignited and burned to generate heat energy and output power to the outside. In this process, the air duct is like the throat of the engine, which controls the size, direction and intensity of the airflow in the intake cylinder, and is an important component that affects the engine's power, fuel consumption, and emissions.
With the efforts of R&D personnel, the improved intake port can achieve the development goals of 15% increase in engine power and 10% increase in thermal efficiency.
With more than 300 parts and more than 3000 assembly steps, the V-shaped 12-cylinder engine represents the highest level of automobile engine manufacturing. Due to the particularity of the craft, all V12 engines in the world are made by hand.
The improved V12 engine can run normally at a high speed of more than 5000 rpm and a flip angle of 40 degrees, which is equivalent to emergency braking and turning at a speed of more than 100 kilometers per hour, the combustion and lubrication system of the engine , Can still maintain stability.
Not only that, even in idling conditions that are most prone to jitter, a 1 yuan coin can stand firmly on a running engine.
With stable combustion, the V12 engine has excellent vehicle noise control. At a speed of 60 kilometers per hour, the intelligibility of the voice in the car is as high as 98%.
Relying on the development of V-type 12-cylinder engines, many new technologies have been used in the development of 4-cylinder and 6-cylinder engines. The thermal efficiency of the Hongqi third-generation engine can achieve 39%, which brings lower emissions and fuel consumption.
