Patent ID: 9689305
Date: 2017-06-27
CPC Classifications: F02B,F02D,F02P,Y02T

Claim:
1. A method for operating an internal-combustion engine the method comprising: increasing a torque demand on the internal-combustion engine; wherein the internal combustion engine is a spark ignition internal-combustion engine having an ignition angle that is adjustable with an electronic control unit, the internal combustion engine has an exhaust gas turbocharger with a turbine arranged in an exhaust gas section that guides an exhaust gas away from the internal-combustion engine, the internal combustion engine has a compressor arranged in an intake air section that guides an intake air toward the internal-combustion engine, the internal combustion engine has a throttle valve provided in a flow direction of the intake air downstream of the compressor and upstream of the internal-combustion engine, and the internal combustion engine has a compressed-air injection device including at least one pressure tank and an air injection valve, the air injection valve being openable and closable with the electronic control unit, to thereby introduce compressed air into the intake air section between the throttle valve and the internal-combustion engine, within the intake air section, a first gas pressure (p controlling the throttle valve with the electronic control unit, opening the air injection valve and continuously measuring the first and second gas pressure pi, p closing the throttle valve with the electronic control unit at an earliest of either a time when the air injection valve opens, or a time when the second pressure p measuring a first gas mass flow, which corresponds to an amount of air that is delivered into the internal-combustion engine, and measuring a second gas mass flow, which corresponds an amount of air to obtain a desired torque, with the electronic control unit; retarding an ignition angle when the first gas mass flow is greater than the second gas mass flow beginning to close the air injection valve when the first gas mass flow multiplied by a factor e completely closing the air injection valve when the exhaust gas turbocharger reaches a defined rotational speed; opening the throttle valve with the electronic control unit when the first gas pressure pi equals the second gas pressure p continuously controlling the fuel system with the electronic control unit to have a stoichiometric fuel/air ratio constantly combusting, to operate the internal combustion engine.