Patent ID: 11879373
Assignee: VOLVO CAR CORPORATION
Field: Environmental technology (Chemistry)
Classification: CPC F  Y | IPC F

Claim 11:
12. A method of pre-heating a catalyst in an exhaust after treatment system, comprising a combustion engine with an outlet connected at a first end to a first exhaust outlet pipe section, a catalytic converter, a heater elements, a second outlet pipe section having an outlet opening at a second end, and a vacuum canister which is in fluid connection with a first section of the exhaust outlet pipe between the first end and the catalytic converter, said vacuum canister being arranged to store gases flowing from the second end towards the first end of the exhaust outlet pipe during a pre-set period of time and adapted to release the stored gases in a controlled manner when exhaust gases from the engine are flowing toward the outlet opening, the heater element being placed downstream of first pipe section when seen in a flow direction of the exhaust gases when the engine is running, the vacuum canister is provided with a control valve in the fluid connection between said canister and the exhaust outlet pipe, said control valve being adapted for releasing gases from the vacuum canister into the exhaust outlet pipe in a controlled manner, the pre-set period is when the vehicle is started and prior to the engine turning on,
the method comprising: during the pre-set period, activating the heater element and flowing gases from the second outlet pipe section along the heater element and the catalytic converter into the first outlet pipe section, and opening the control valve in the first section of the exhaust outlet pipe such that gas is sucked into the canister.