发动机在冷起动时废气排放较高,主要是由于起始温度低,不能达到催化转化器工作温度而使其不起作用及发动机起始预热时需适当的浓混合气而造成。要达到催化转化器工作温度(200～400℃,由催化剂决定)必须要一段时间,才能使催化转化器 The engine exhaust emissions at cold start higher, mainly due to the low starting temperature, can not reach the catalytic converter operating temperature makes it ineffective and the engine starts preheating due to the rich mixture. To reach the catalytic converter operating temperature (200 ~ 400 ℃, determined by the catalyst) it will take some time before the catalytic converter