DUAL-FUEL INTERNAL COMBUSTION ENGINE
A dual-fuel internal combustion engine including at least one combustion chamber. The at least one combustion chamber is paired with an inlet valve for a gas-air mixture and an injector for liquid fuel. The internal combustion engine also includes a regulating device which is designed to carry out a switchover in a switchover mode such that a quantity of energy supplied to the at least one combustion chamber by a gas-air mixture is changed, and a quantity of energy supplied to the at least one combustion chamber by the liquid fuel and/or the time of the injection of the liquid fuel is changed. The regulating device is designed to carry out the switchover on the basis of a current load of the dual-fuel internal combustion engine, wherein the regulating device is designed to select an excess air coefficient of the gas-air mixture in the switchover mode, the coefficient being larger than a target excess air coefficient in a pilot operation.
1 . A dual-fuel internal combustion engine, comprising:
at least one combustion chamber, wherein the at least one combustion chamber is paired with an inlet valve for a gas-air mixture and an injector for liquid fuel; and
a control device, which is designed to carry out a switchover in a switchover mode such that
an amount of energy supplied to the at least one combustion chamber by a gas-air mixture is changed, and
an amount of energy supplied to the at least one combustion chamber by the liquid fuel and/or the time of injection of the liquid fuel is change;
wherein the control device is designed to carry out the switchover on the basis of the current load of the dual-fuel internal combustion engine; and
wherein the control device is designed to select an excess air coefficient of the gas-air mixture in the switchover mode, the coefficient being larger than the target excess air number in pilot operation.
2 . The dual-fuel internal combustion engine according to claim 1 , wherein the control device is designed to select a longer switchover duration the higher the load is.
3 . The dual-fuel internal combustion engine according to claim 1 , wherein the control device is designed to select, in switchover mode, a time of injection of the liquid fuel later than the target time of injection in pilot operation.
4 . The dual-fuel internal combustion engine according to claim 1 , wherein the control device is designed to carry out the switchover quasi-stationary when a load change occurs.
5 . The dual-fuel internal combustion engine according to claim 1 , wherein the control device is designed to carry out the switchover dynamically when a load change occurs.
6 . The dual-fuel internal combustion engine according to claim 1 , wherein the control device is designed to lower an excess air coefficient of the gas-air mixture at a load increase above a predetermined limit value.
7 . The dual-fuel internal combustion engine according to claim 1 , wherein the control device is designed to increase the amount of energy supplied by the liquid fuel to the at least one combustion chamber and/or change the time of injection of the liquid fuel to a later time in the event of a load change in switchover mode above the predetermined limit.
8 . The dual-fuel internal combustion engine according to claim 7 , wherein the control device is designed to increase the excess air coefficient of the gas-air mixture in the event of a load change in switchover mode above the predetermined limit.
9 . A method for switchover of a dual-fuel internal combustion engine, comprising: making the switchover by
changing an amount of energy supplied to an at least one combustion chamber through a gas-air mixture, and at least one of
changing an amount of energy supplied to the at least one combustion chamber by a liquid fuel and changing a time of injection of the liquid fuel;
wherein the switchover is made on the basis of a current load of the dual-fuel internal combustion engine; and wherein during the switchover an excess air coefficient of the gas-air mixture is selected, the excess air coefficient being larger than a target excess air coefficient in pilot operation.