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

Claim 0:
1. An exhaust after treatment system for a vehicle, comprising:
an exhaust outlet pipe, having a first end that is connectable to a vehicle engine, for receiving exhaust gases from said vehicle engine, and having an outlet opening at a second end, arranged to eject the outlet gases,
a catalytic converter, connected to the exhaust outlet pipe,
an electric heater element which is in heat exchanging contact with the catalytic converter and adapted for pre-heating the catalytic converter,
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 positioned downstream of the catalytic converter with respect to the first end, and the exhaust after treatment system being adapted to, upon the vehicle being started, switch on the heater element and flow gases from the second end, in the direction of the first end of the exhaust outlet pipe, through the catalytic converter for the pre-set period of time prior to passing exhaust gases from the engine towards the outlet opening at the second end,
wherein 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,
wherein the pre-set period is when the vehicle is started and prior to the engine turning on, and
a controller activate the heater element and opens the control valve in the first section of the exhaust outlet pipe such that gas is sucked into the canister during the pre-set period.