Method for controlling gear shift

Patent metadata

Field	Value
Publication number	US-9562592-B2
Application number	US-201514863666-A
Country	US
Kind code	B2
Filing date	Sep 24, 2015
Priority date	Sep 25, 2014
Publication date	Feb 7, 2017
Grant date	Feb 7, 2017

Abstract

A method for controlling a power-split gear shift device in a vehicle by providing an electric variator and a transmission with variable gear shift and connecting a drive motor to a traction drive of the vehicle. The electric variator has a compound gear train with at least one first and at least one second electric machine. The method also includes providing a controller for the electric machines for steplessly varying a gear shift of the compound gear train. Upon detection of an external power requirement by an electric consumer, a gear shift region of the transmission with variable gear shift is set to operate the first electric machine in a generator mode and to operate the second electric machine to compensate for an existing power deficit or a power excess relative to an external power demand.

First claim

The invention claimed is:

1. A method for controlling a power-split gear shift device in a vehicle, comprising:
providing a transmission with variable gear shift for connecting a drive motor to a traction drive of the vehicle, an electric variator having a compound gear train with at least one first electric machine and at least one second electric machine, and a controller of the first and second electric machines for steplessly varying a gear shift of the compound gear train;
detecting an external power requirement by an electric consumer;
setting a gear shift region of the transmission with variable gear shift;
operating the first electric machine and the second electric machine, the first electric machine being operated in a generator mode; and
compensating for an existing power deficit or a power excess relative to an external power demand.

2. The method of claim 1 , wherein the setting step comprises setting a gear shift of the transmission based on a driving resistance, the external power demand, and a desired vehicle speed.

3. The method of claim 1 , further comprising:
providing an energy storage unit coupled to the control; and
using the energy storage unit to compensate for the power excess or deficit relative to the external power demand.

4. The method of claim 1 , further comprising:
adjusting a torque of the electrical machines via the control independent of the rotational speed of the first and second electrical machines;
supplying energy into each of the electrical machines or an energy storage unit; and
operating each of the first and second electrical machines in the generator mode.

Assignees

• Deere & Co

Inventors

• Rekow Andrew K
• Jeffries Dennis L
• Fritz Norbert
• Mueller David
• Gugel Rainer

Classifications

• B60W10/26

  for electrical energy, e.g. batteries or capacitors · CPC title

• B60W2510/305

  Power absorbed by auxiliaries · CPC title

• F16H2061/6603

  characterised by changing ratio in the mechanical gearing · CPC title

• F16H61/686

  with orbital gears · CPC title

• F16H2200/2051

  with eight engaging means · CPC title