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Method for controlling an automatic transmission

Imported: 24 Feb '17 | Published: 06 Jan '04

Wolfgang Netzer

USPTO - Utility Patents

Abstract

A method for control of a transmission of a vehicle, especially of an automatic transmission or an automated manual mechanical transmission with hydraulically actuatable shifting elements is described. A speed signal (n_ab_ist, n_t_ist) of the output train with precalculatable time curve (n_ab_soll, n_t_soll) is determined and for adjustment of a nominal filling of the shifting elements an interference signal (P

1, P

2, P

3, P

4, PF

1, PF

2, PF

3, PF

4) is applied. In case of a untolerable divergence of the speed signal (n_ab_ist, n_t_ist) of the output train from its precalculated curve, a divergence from the nominal filling of the shifting element is detected, the information being processed for control of the shifting elements.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

Other advantages and development of the invention will now be described, by way of example, with reference to the accompanying drawings in which:

FIG. 1 is two extensively schematized pressure curves of an engaging shifting element and of a disengaging shifting element during an overlapping gear shift;

FIG. 2 is a nominal value curve of an output speed and/or of a turbine speed determined from detected actual values of the output speed and or of the turbine speed;

FIG. 3 is a flow chart showing the cycle of an adaptation of a rapid filling time of a filling phase of a shifting element;

FIG. 4 is a flow chart showing the cycle of an adaptation of a charge pressure of a filling phase of a shifting element;

FIG. 5 is a schematized pressure curve in the course of time during the adaptation fo the filling element according to FIG. 4; and

FIG. 6 is a flow chart of a starting module which is connected in series on the adaptation of the rapid filling time and on the adaptation of the charge pressure.

Claims

1. A method for control of a transmission of a motor vehicle with hydraulically actuatable shifting elements wherein a shifting operation of a shifting element includes a rapid filling phase including a rapid filling time and a charge pressure phase wherein a charge pressure is provided to the element, comprising the steps of:

2. The method according to claim 1, wherein the transmission output train speed signal of the output train is one of an output speed, a turbine speed, or a speed signal equivalent thereto.

3. A method for control of a transmission of a motor vehicle with hydraulically actuatable shifting elements wherein a shifting operation of a shifting element includes a rapid filling phase including a rapid filling time and a charge pressure phase wherein a charge pressure is provided to the element, comprising step of:

4. A method for control of a transmission of a motor vehicle with hydraulically actuatable shifting elements wherein a shifting operation of a shifting element includes a rapid filling phase including a rapid filling time and a charge pressure phase wherein a charge pressure is provided to the element, comprising the steps of:

5. A method for control of a transmission of a motor vehicle with hydraulically actuatable shifting elements wherein a shifting operation of a shifting element includes a rapid filling phase including a rapid filling time and a charge pressure phase wherein a charge pressure is provided to the element, comprising the steps of:

6. The method according to claim 5, further comprising the step of:

7. The method according claim 5, further comprising the steps of:

wherein

8. The method according to claim 5, further comprising the step of:

9. The method according to claim 8, further comprising the step of:

10. The method according to claim 9, comprising the steps of:

11. The method according to claim 10, further comprising the steps of:

12. The method according to claim 11, further comprising the steps of:

13. The method according to claim 12, further comprising the steps of:

14. The method according to claim 5, further comprising the step of:

15. The method according to claim 14, further comprising the steps of:

16. The method according to claim 15, further comprising the steps of:

17. The method according to claim 16, further comprising the steps of:

18. The method according to claim 17, further comprising the steps of:

19. The method according to

18, further comprising the steps of:

20. The method according to claim 19, further comprising the steps of;