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Perfect performance of economy and emissions make hybrid powertrain used more widely, but frequent engine start may affect vehicle’s driveability. In order to obtain how to improve hybrid vehicle’s driveability, Audi A6 Hybrid which is equipped with a P2 powertrain with two engine start modes: conventional start with a 12 V starter and hybrid start with a high-voltage motor, is evaluated under several driving situations with frequently-used criteria. Test results show Audi A6 Hybrid can gain perfect driveability in all engine start situations. Avoiding to start engine frequently in some special situations, suitable choice of engine start modes, compensating driver’s request torque by down-shifting gear or increasing the traction motor torque, and maneuver sequences of K0 clutch are all helpful to obtain perfect driveability for Audi A6 Hybrid.
Perfect performance of economy and emissions make hybrid powertrain used more widely, but frequent engine start may affect vehicle’s driveability. In order to obtain how to improve hybrid vehicle’s driveability, Audi A6 Hybrid which is equipped with a P2 powertrain with two engine start modes: conventional start with a 12 V starter and hybrid start with a high-voltage motor, which is evaluated under several driving situations with frequently-used criteria. Test results show Audi A6 Hybrid can gain perfect driveability in all engine start situations. Avoiding to start engine frequently in some special situations, suitable choice of engine start modes, compensating driver’s request torque by down-shifting gear or increasing traction electric torque, and maneuver sequences of K0 clutch are all helpful to obtain perfect driveability for Audi A6 Hybrid.