Patent ID: 9657621
Date: 2017-05-23
CPC Classifications: F01N,Y02T

Claim:
1. An exhaust system, comprising: a first catalyst downstream of a branchpoint in a first exhaust pathway, a second catalyst downstream of the branchpoint in a second exhaust pathway, an electrical heater positioned upstream of the branchpoint for heating an exhaust flow delivered to both the first and second catalysts, a control unit with instructions for adjusting an exhaust heating current of the electrical heater, a valve for adjusting a distribution of exhaust flow to the first catalyst and the second catalyst, the control unit including instructions to adjust the valve responsive to a substrate temperature within one or more of the first and second catalysts, and differentially heat the first catalyst to a first target temperature using a first exhaust flow and the second catalyst to a second target temperature using a second exhaust flow.