POWERTRAIN FOR A HYBRID VEHICLE AND A METHOD FOR CONTROL OF THE POWERTRAIN

摘要

A powertrain for a hybrid vehicle includes a first propulsion unit for powering the vehicle, a second propulsion unit for powering the vehicle, a Dual Clutch Transmission (DCT), and the second propulsion unit the ECU is programmed to control the gear shift such that when a gear shift of the first propulsion unit is made in order to change the overall gear ratio from the first input shaft to the output shaft by changing the double clutch engagement from the second clutch, engaging the second power path, to the first clutch, engaging the first power path, the power connection between the second propulsion unit and the second power path is maintained.

主权项

1. A powertrain for a hybrid vehicle, the powertrain comprising:
a first propulsion unit for powering the vehicle a second propulsion unit for powering the vehicle a Dual Clutch Transmission (DCT) comprising a first input shaft and an output shaft, the first input shaft being mechanically connected to a double clutch arrangement wherein a first power path is defined by engaging a first clutch and a second power path is defined by engaging a second clutch wherein power is transferred from the first input shaft to the output shaft, each power path comprising a main gear box wherein the main gear box comprises at least two gears having different gear ratios, the first propulsion unit being mechanically connected to the first input shaft such that a torque provided by the first propulsion unit is transferred to the output shaft via either of the first and second power path, and each of the power paths having gear ratios defined by gearwheels in the power path such that an overall gear ratio from the first input shaft to the output shaft is defined and at least some of the gear ratios of the first and second power path being designed such that a one-step upshift or downshift of the overall gear ratio from the first input shaft to the output shaft involves a shift of the power path, i.e. a shift of the engaged clutch in the double clutch arrangement, and the second propulsion unit being mechanically connected to a second input shaft of the DCT which connection does not include the double clutch arrangement and is connected to the second power path downstream the double clutch arrangement but upstream the associated main gear box the DCT is connected to an Electronic Control Unit (ECU) which is configured to control the engagement and disengagement of the first and second clutch of the double clutch arrangement and the gear positions of the gears of the main gear box associated with each one of the first and second power path, wherein the ECU is programmed to control the gear shift such that when a gear shift of the first propulsion unit is made in order to change the overall gear ratio from the first input shaft to the output shaft by changing the double clutch engagement from the second clutch, engaging the second power path, to the first clutch, engaging the first power path, the power connection between the second propulsion unit and the second power path is maintained, the second input shaft of the second propulsion unit is connected to a countershaft of the DCT, the countershaft being mechanically connected via gear wheels to a main shaft, the countershaft being a different shaft than output shafts from the first clutch respectively the second clutch of the double clutch arrangement, and the second propulsion unit is connected to the countershaft via a clutch.