This invention is of control system one kind of rich hydrogen gas auxiliary internal combustion engine engine combustion, it contains an engine management unit, a control unit, a supply of fuel installment, a detection unit, a reorganization as well as a fuel tank; And, this engine management unit with an engine connection, and may accept revolution of signal this engine; This detection unit is may put in exhaust pipe of this engine, detects exhaust of condition this engine; But this control unit separately with this engine management unit and this detection unit connection, and may rest on the two input to control this supply of fuel installment, causes this supply of fuel installment fuel of output this fuel tank to this reorganization, but this reorganization may and outputs the fuel decomposition reorganization for the rich hydrogen gas to this engine, so, promotes this engine's operating efficiency and the reduced waste gas withdrawal.