Method and device for controlling a creep mode of a vehicle comprising a hybrid drive

摘要

The invention relates to a method for controlling a creep mode of a vehicle comprising a hybrid drive (1), a drive train (2) which essentially comprises an internal combustion engine (3), an electric machine (5), a gear-shift element (4) arranged between the internal combustion engine (3) and the electric machine (5), a transmission (7) and a power take-off (26). The aim of the invention is to allow an efficient creep mode which is substantially temporally unlimited and reliable and wherein an electrical energy storage device (14) is used as little as possible. The method according to the invention is characterized in that primarily the gear-shift element (4) is used when the internal combustion engine (3) is running and secondarily, depending on a monitoring of defined operation parameters of the gear-shift element (4) and/or of variables relevant for the creep mode, the electric machine (5) is used to implement the creep mode. A device for carrying out the method comprises control and monitoring means (21, 22, 25, 27) which are used for producing a creep torque, taking into consideration an admissible load of the gear-shift element (4), primarily by operating the gear-shift element (4) in a slip mode and secondarily by operating the electric machine (5) in a creep mode.

主权项

1. A process for controlling a creep mode of a vehicle with a hybrid electric power train, which has a drive train comprising an internal combustion engine, an electric motor, a clutch element comprising a clutch located between the internal combustion engine and the electric motor and a torque sensor configured to determine a measured torque transmitted by the clutch, and a transmission operatively connected to the electric motor
wherein while the internal combustion engine is running, in order to supply a desired creep torque, primarily the clutch element is utilized, and secondarily, depending on a monitoring of predetermined operating parameters of the clutch element and/or from dimensions relevant for the creep mode, the electric motor is utilized, and wherein the clutch element is configured to transmit a clutch torque that varies in response to the measured torque, and wherein the transmitted clutch torque does not exceed a maximal threshold value of the measured torque.