Low soot stoichiometric compression-ignition combustion

A method of operating a combustion system, the method comprising:

• controlling an amount of oxygenated fuel that is injected into a combustion chamber each time that a piston reciprocates in the combustion chamber to maintain a stoichiometric air-fuel mixture in the combustion chamber, where the stoichiometric air-fuel mixture is maintained to mitigate emission of soot from the combustion system;
• igniting the air-fuel mixture in the combustion chamber to cause combustion of the air-fuel mixture, wherein particulates are generated during combustion of the air-fuel mixture in the combustion chamber;
• directing exhaust from the combustion chamber caused by combustion of the air-fuel mixture to an EGR device by way of an exhaust channel;
• recirculating, by the EGR device, a portion of the exhaust caused by the combustion of the air-fuel mixture back into the combustion chamber;
• and
• converting, by a three-way catalytic converter that is in line with the exhaust channel, a second portion of the exhaust from a first chemical mixture to a second chemical mixture.

A method for operating a combustion system, the method comprising:

• maintaining a stoichiometric air-fuel mixture in a compression chamber of the combustion system to mitigate emission of soot by the combustion system, where maintaining the stoichiometric air-fuel mixture comprises:
• repeatedly reciprocating a piston within the compression combustion chamber;
• for each reciprocation of the piston within the compression combustion chamber, injecting an amount of oxygenated fuel into the compression combustion chamber such that the air-fuel mixture formed within the compression combustion chamber is stoichiometric,
• compressing the air-fuel mixture in the compression combustion chamber to ignite the air-fuel mixture, wherein exhaust gas output from the compression combustion chamber is free of soot;
• directing the exhaust gas away from the combustion chamber by way of an exhaust channel;
• recirculating, by an EGR that is in communication with the exhaust channel, a first portion of the exhaust gas back into the compression combustion chamber;
• and
• converting a second portion of the exhaust gas from a first chemical mixture to a second chemical mixture by way of a three-way catalyst.