1. By driving mode:
- Independent type: The compressor is driven by a dedicated engine, featuring large cooling capacity and stable operation, but with high cost, large size and heavy weight. It is mostly used in large and medium-sized passenger buses.
- Non-independent type: The AC compressor is driven by the vehicle's engine, with cooling performance greatly affected by engine operation and poor stability. It is commonly used in small buses and passenger cars.
2. By air conditioning performance:
- Single-function type: The cooling, heating and ventilation systems are separately installed and operated independently without interference. It is mainly applied to large buses and trucks.
- All-in-one heating and cooling type: The cooling, heating and ventilation systems share the same blower and air ducts, controlled by a single control panel. It includes the combined type (heating and cooling work separately) and the mixed temperature control type (heating and cooling work simultaneously). The mixed temperature control type is widely used in passenger cars.
3. By control method:
- Manual type: Temperature, fan speed and air direction are adjusted by toggling function keys on the control panel.
- Electronically controlled pneumatic adjustment: A vacuum control mechanism is adopted. Once the AC function key is selected, temperature and air volume are automatically controlled within the preset range.
4. By regulation mode:
- Fully automatic adjustment: A computing and comparison circuit actuates the regulating mechanism based on sensor signals and preset signals, automatically adjusting temperature and air volume.
- Microcomputer-controlled fully automatic adjustment: With a microcomputer as the control center, it achieves all-round, multi-functional optimal control and regulation of the in-car air environment.
