Method to power multiple electric heaters with a single power source

A engine exhaust system includes a diesel oxidation catalyst (DOC) configured to receive the engine exhaust gases, a first electric heater coupled to the DOC, and a selective catalytic reduction (SCR)device in fluid communication with the DOC. The engine exhaust system further includes a second electric heater coupled to the DOC, a power switch controller in electronic communication with the first electric heater and the second electric heater, and a single power source electrically coupled to the power switch controller, the first electric heater, and the second electric heater. The power switch controller includes a switch to control a power distribution between the first electric heater and the second electric heater as a function of time. 一种发动机排气系统，包括配置成接收发动机排气的柴油机氧化催化器(DOC)、联接到DOC的第一电加热器以及与DOC流体连通的选择性催化还原(SCR)装置。发动机排气系统还包括联接到DOC的第二电加热器、与第一电加热器和第二电加热器电子通信的功率开关控制器以及电联接到功率开关控制器、第一电加热器和第二电加热器的单个电源。功率开关控制器包括开关，用于根据时间控制第一电加热器和第二电加热器之间的功率分配。