Procedure for operating a transmission device

Patent metadata

Field	Value
Publication number	US-9500262-B2
Application number	US-201414177263-A
Country	US
Kind code	B2
Filing date	Feb 11, 2014
Priority date	Feb 20, 2013
Publication date	Nov 22, 2016
Grant date	Nov 22, 2016

Abstract

A method of operating a transmission device having gears that are engaged by actuating shifting elements. At least one of the shifting elements is an interlocking shifting element which has to be engaged in at least one gear to transmit drive between an input and an output shaft. When a command is received to engage the interlocking shifting element, a rotational speed of the input shaft is displaced in the direction toward a synchronous rotation speed produced in the engaged operating condition of the interlocking shifting element at least as a function of the rotational speed of the output shaft. The engagement process of the interlocking shifting element from its disengaged operating condition is discontinued if, before reaching the synchronous rotational speed, the variation of the rotational speed of the input shaft crosses a predefined rotational speed threshold without initiating engagement of the interlocking shifting element.

First claim

The invention claimed is:

1. A method of operating a transmission device ( 1 ) which can be changed to various defined operating conditions by actuating shifting elements (A to F), at least one of the shifting elements (A, F) is an interlocking shifting element which, in order to obtain at least one of the various defined operating conditions of the transmission device ( 1 ), during which a force flow exists between a transmission input shaft ( 2 ) and a transmission output shaft ( 3 ), has to be changed to an engaged operating condition of the interlocking shift element, the method comprising the steps of:
when the interlocking shifting element (A, F) has to be engaged, varying either a rotational speed (nt) of the transmission input shaft ( 2 ) or a turbine rotational speed equivalent thereto in a direction toward a synchronous rotational speed (nt(“ 4 ”)), which is produced in the engaged operating condition of the interlocking shifting element (F), at least as a function of a rotational speed of the transmission output shaft ( 3 ), and
discontinuing engagement of the interlocking shifting element (A, F), if:
the rotational speed (nt) of the transmission input shaft ( 2 ) or the turbine rotational speed equivalent thereto crosses a predefined rotational speed threshold (ntS 1 ) before reaching the synchronous speed (nt(“ 4 ”)); and
the interlocking shifting element (A, F) has not been actuated in an engaging direction.

2. The method according to claim 1 , further comprising the steps of
determining a first time point (T 4 ) before the rotational speed (nt) of the transmission input shaft ( 2 ) or the turbine rotational speed equivalent thereto reaches the synchronous rotational speed (nt(“ 4 ”)), the first time point (T 4 ) being a point in time by which actuation of the interlocking shifting element (F) in the engaging direction must be started, and
discontinuing engagement of the interlocking shifting element (F), if the rotational speed (nt) of the transmission input shaft or the turbine rotational speed equivalent thereto crosses the predefined rotational speed threshold (ntS 1 ) at an earlier time point (T 9 ) which is earlier than the determined first time point.

3. The method according to claim 1 , further comprising the step of actuating the interlocking shifting element (F) in the engaging direction if the rotational speed (nt) of the transmission input shaft ( 2 ) or the turbine rotational speed equivalent thereto crosses a further predefined rotational speed threshold (ntS 2 ), which the rotational speed (nt) of the transmission input shaft ( 2 ) or the turbine rotational speed equivalent thereto reaches before the predefined rotational speed threshold (ntS 1 ).

4. The method according to claim 1 , further comprising the step of discontinuing engagement of the interlocking shifting element (F) from a disengaged operating condition, if the rotational speed (nt) of the transmission input shaft ( 2 ) or the turbine rotational speed equivalent thereto, after reaching the synchronous rotational speed (nt(“ 4 ”)) in the interlocking shifting element (F) actuated in the engaging direction, crosses an additional predetermined rotational speed threshold (ntS 3 ).

5. The method according to claim 4 , further comprising the step of starting a timer when the rotational speed (nt) of the transmission input shaft ( 2 ) or the turbine rotational speed equivalent thereto, after reaching the synchronous rotational speed (nt(“ 4 ”)) in the interlocking shifting element (F) actuated in the engaging direction, crosses an additional further predefined rotational speed threshold (ntS 4 ) before the additional predefined rotational speed threshold (ntS 3 ), and discontinuing the engagement process of the interlocking shifting element (F) from the disengaged operating condition, if the timer reaches a predetermined value.

6. The method according to claim 1 , further comprising the step of once the engagement process of the interlocking shifting element (F) has been discontinued, changing the transmission device ( 1 ) to a safe operating condition in which both the transmission input shaft ( 2 ) and the transmission output shaft ( 3 ) are rotatable.

7. The method according to claim 6 , further comprising the step of defining the safe operating condition of the transmission device ( 1 ) as a neutral operating condition in which the force flow between the transmission input shaft ( 2 ) and the transmission output shaft ( 3 ) is interrupted.

8. The method according to claim 6 , further comprising the step of correlating the safe operating condition to another of the various defined operating conditions of the transmission device ( 1 ) before a command to engage the interlocking shifting element (F).

9. The method according to claim 1 , further comprising the step of varying at least one of the rotational speed threshold (ntS 1 ), a further rotational speed threshold (ntS 2 ), an additional rotational speed threshold (ntS 3 ) and an additional further rotational speed threshold (ntS 4 ) as a function of an operating temperature of the transmission device ( 1 ).

10. The method according to claim 1 , further comprising the step of varying at least one of the rotational speed threshold (ntS 1 ), a further rotational speed threshold (ntS 2 ), an additional rotational speed threshold (ntS 3 ) and an additional further rotational speed threshold (ntS 4 ) as a function of a gradient of a variation of a difference between the current rotational speed (nt) of the transmission input shaft ( 2 ) and the synchronous rotational speed (nt(“ 4 ”)) of the transmission input shaft ( 2 ) or of the turbine rotational speed equivalent thereto.

11. A method of operating a 9-gear transmission device ( 1 ) which has a plurality of actuating shifting elements, at least one of the actuating shifting elements is an interlocking shifting element which is engaged in a flow of force between a transmission input shaft ( 2 ) and a transmission output shaft ( 3 ) to implement at least one defined operating condition of the transmission device ( 1 ), the method comprising the steps of:
adjusting a rotational speed (nt) of the transmission input shaft ( 2 ) toward a synchronous rotational speed of the interlocking shifting element (A, F) as a function of a rotational speed of the transmission output shaft ( 3 ); and
discontinuing engagement of the interlocking shifting element (A, F) if:
the rotational speed (nt) of the transmission input shaft ( 2 ) crosses a predefined rotational speed threshold (ntS 1 ) before reaching the synchronous speed (nt(“ 4 ”)) of the interlocking shifting element (A, F); and
the interlocking shifting element (A, F) has not been actuated in an engaging direction.

Assignees

• Zahnradfabrik Friedrichshafen

Inventors

• Arnold Jorg
• Steinhauser Klaus

Classifications

• F16H2200/2046

  with six engaging means · CPC title

• F16H2200/2023

  using a Ravigneaux set with 4 connections · CPC title

• F16H3/02 Primary

  without gears having orbital motion · CPC title

• F16H2200/0065

  the gear ratios comprising nine forward speeds · CPC title

• F16H2200/201

  with three sets of orbital gears · CPC title