Granted Patent B2

US 12,264,739 · App. 18/512,674 · Granted Apr 1, 2025

Inventors: Wilhelm Moser (Oberteuringen, DE); Alain Tierry Chamaken Kamde (Friedrichshafen, DE)

Assignee: ZF Friedrichshafen AG

F16H61/04B60L15/20F16H59/68F16H63/04F16H63/304F16H63/502F16H2059/6807F16H2061/047

Abstract

Claims (47)

1. A method for operating an interlocking shifting element of a transmission of a vehicle, wherein the interlocking shifting element comprises shifting element halves configured to be moved relative to one another when opening and closing the interlocking shifting element, and wherein an electric actuator is configured and arranged to bring about the relative movement between the shifting element halves when opening or closing the interlocking shifting element, the method comprising:

recognizing a tooth-on-tooth position in the interlocking shifting element; and

determining, as a function of an electric current strength through the electric actuator, a target torque to be applied at a transmission input of the transmission sufficient to resolve the tooth-on-tooth position in the interlocking shifting element;

wherein determining the target torque is performed according to the following equation:

M

SOLL

=

K

M

*

I

A

r

S

*

μ

Z

*

r

Z

+

M

0

and wherein

M SOLL is the target torque,

I A is the electric current strength of the electric actuator,

K M is a proportionality constant,

r S is a radius of a spindle of the electric actuator,

μ Z is a coefficient of friction valid for the transmission,

r Z is a friction radius of the transmission valid for the interlocking shifting element,

M 0 is a torque to be transmitted by the interlocking shifting element.

2. The method according to claim 1 , wherein the vehicle comprises a drive unit, the method further comprising:

controlling the drive unit to deliver the target torque at the transmission input to resolve the tooth-on-tooth position in the interlocking shifting element.

3. The method according to claim 2 , wherein the drive unit comprises an electric machine.

4. The method according to claim 1 , wherein recognizing the tooth-on-tooth position is performed as a function of the electric current strength through the electric actuator.

5. The method according to claim 4 , wherein recognizing the tooth-on-tooth position comprises:

activating, by the electric actuator, the interlocking shifting element;

recognizing, before a lapse of a pre-defined time interval since a beginning of activating the interlocking shifting element by the electric actuator, that the electric current strength in the electric actuator is greater than a limit value; and

determining a shifting position of the interlocking shifting element to be the tooth-on-tooth position of the interlocking shifting element based at least in part on the electric current strength being greater than the limit value.

6. A control unit of a vehicle transmission, wherein the control unit is configured to

(i) bring about opening and/or closing of an interlocking shifting element by activating an electric actuator to produce a relative movement between shifting element halves of the interlocking shifting element;

(ii) recognize a tooth-on-tooth position in the interlocking shifting element; and

(iii) determine, as a function of an electric current strength in the electric actuator, a target torque to be provided at a transmission input of the transmission sufficient to resolve the tooth-on-tooth position in the interlocking shifting element;

wherein the control unit is configured to automatically carry out the method of claim 1 .

7. A transmission of a vehicle, comprising the control unit of claim 6 .

8. A vehicle comprising the control unit of claim 6 .

9. The vehicle of claim 8 , wherein the vehicle is an electric vehicle.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (24)