Patent ID: 11932234
Assignee: BAYERISCHE MOTOREN WERKE AKTIENGESELLSCHAFT
Field: Transport (Mechanical engineering)
Classification: CPC B  F  Y | IPC B

Claim 0:
1. A motor vehicle, comprising:
at least two drive motors, wherein at least one drive motor of the at least two drive motors is an electric motor;
a high-voltage accumulator;
an automatic transmission which has at least one fixed gear ratio and at least one power-split gear ratio for gear ratio adjustment starting from the at least one fixed gear ratio; and
an electronic control unit operatively configured such that, when a gear change command is present:
a shift element to be opened of the fixed gear ratio to be disengaged is relieved in a torque-controlled manner by at least two of the at least two drive motors,
a torque load is calculated and observed for the shift element to be opened,
the torque load is observed with an objective of bringing about a load change by way of a zero crossing in order to establish freedom from load at the shift element,
for establishing the freedom from load for the shift element to be opened, a first drive motor of the at least two drive motors and a second drive motor of the at least two drive motors are controlled in a power-split so as to maintain the gear ratio of the previously engaged fixed gear ratio in terms of speeds and put the shift element to be opened in an at least nearly load-free state in terms of torques, and
the load change is brought about at the shift element to be opened by a differential speed, opposite the calculated torque load at the shift element to be opened, being specified at the shift element,
wherein when a defined threshold value of the observed torque load on the shift element to be opened is exceeded, a sign of a required differential speed on the shift element to be opened is changed for a speed controller.