Diesel hybrid drive technology with urea-free NOx conversion

摘要

Drive device for a vehicle with a diesel engine (11) and an electric motor (12), the drive device (10) comprising: - an exhaust gas aftertreatment device (13) for treating the exhaust gas (34) of the diesel engine (11), the exhaust gas - Aftertreatment device (13) has an exhaust gas passage (14) on which are arranged in the flow direction of the exhaust gas (34): ◯ a controllable fuel addition device (17) to add fuel to the exhaust gas (34) in the exhaust gas passage (14); ◯ A catalytic converter (20) for removing nitrogen oxides (NOx) from the exhaust gas (34) by reaction with the added fuel; - A control device (23) for controlling the addition of fuel; characterized in that the control device (23) is designed for this purpose - In high-load operation (MODE 1) of the drive device (10) to control the fuel addition device (17) in such a way that the air-fuel is added by adding fuel to the exhaust gas (34) (post-engine addition quantity) Ratio of the A bgases (34) in the area of the catalytic converter (20) is approached to a target value which is close to the stoichiometric equilibrium; AND- to determine a required amount for a fuel addition in the diesel engine (11) (in-engine addition amount), which is required in addition to the after-engine addition amount to keep the air-fuel ratio of the exhaust gas (34) in the range of the catalytic converter (20) to approach the target value; AND - to generate an addition control instruction for the diesel engine (11) so that the in-engine addition amount of fuel is added to the drive device (10) in high-load operation (MODE 1); - a compensation control instruction for the electric motor (12 ) to generate so that an excess power (Pex) of the diesel engine (11), which results from the in-engine addition amount, is absorbed by the electric motor (34).