目前我国公共汽车的主机大多数是用汽油发动机,其电气设备的电压采用12V系。随着主机厂品种的发展,以第一汽车制造厂为主的6110系列柴油机的生产,公共汽车的主机用柴油机将越来越多。特别是团体旅游车的主机,为了降低车箱内的噪声,通常是使发动机后置或中置,因此用柴油机最合适。主机采用柴油机后,对电气设备提出了新的要求。由于公共汽车的柴油机功率较大,压缩比高,因此起动阻力矩大,冬季起动比汽油机更加困难。所以 At present, most of the host buses in our country use gasoline engines, and the voltage of their electrical equipment is 12V. With the development of OEM varieties, the production of 6110 series diesel engines based on No.1 Automobile Manufacturing Plant will bring about more and more diesel engines for buses. In particular, the coach of a group touring car is most suitable for a diesel engine in order to reduce the noise in a vehicle compartment, usually by putting the engine in the rear or in the center. Host using diesel engine, the electrical equipment made new requirements. As the bus diesel engine power, high compression ratio, so starting torque, starting winter than gasoline engine more difficult. and so