Type of Booster System: Mechanical Boosting
Construction: The mechanical supercharger is driven by the crankshaft of the engine through the gear accelerator, or by the crankshaft tooth drive pulley through the tooth drive belt and electromagnetic clutch.
Characteristic: Mechanical turbocharging can effectively improve the engine power, and its low-speed turbocharging effect is better than turbocharging. In addition, the mechanical supercharger and the initiator are easy to match, and the structure is comparatively compact. However, the fuel consumption rate is slightly higher than that of the non-supercharged initiator because the power of the initiator is needed to drive the turbocharger.
Type of Booster System: Gas Wave Boosting
CONSTRUCTION: The crankshaft drives the air wave supercharger rotor through the drive belt. The exhaust pressure wave is used to compress the air to step the air pressure.
Characteristic: Gas wave supercharger has simple structure, convenient processing, low operating temperature, no need for heat-resistant materials, and no need for cooling. Compared with turbocharging, its low-speed torque characteristics are good, but its volume is large, the noise level is high, and the azimuth of the device is constrained to a certain extent. The supercharger can only be used in a low speed range. Because the maximum speed of diesel engine is comparatively low, it is mostly used in diesel engine.
Turbocharging System Type of Initiator: Turbocharging
Construction: Using exhaust gas turbine to drive the compressor impeller with its coaxial device to work, new air enters the cylinder after pressurizing in the compressor.
Characteristic: The advantage of turbocharging is better economy than mechanical turbocharging and non-turbocharging initiator, and can greatly reduce the emission of harmful gases and noise level. The defect of turbocharging is that the torque is not much added at low speed, and the transient response is poor when the engine working condition changes, which results in poor acceleration of the car, especially at low speed.
Type of Booster Supercharging System: Compound Supercharging
Structure: proper separation of mechanical and turbocharging
Series compound turbocharging: In this turbocharger system, air advances pressure through the turbocharger, enters the intermediate cooler to cool down, and then supercharges through the mechanical turbocharger. This type of booster is mainly used in high booster initiator.
Parallel compound turbocharger: Supercharged air is supplied to the engine by mechanical turbocharger and turbocharger. In the low speed range, it mainly depends on mechanical turbocharging, while in the high speed range, it mainly depends on turbocharging. This turbocharging system improves the low-speed torque characteristics of the engine.