US 5,157,609 AGranted

Method and apparatus for controlling an automatically shifting transmission

AssigneesDr. Ing. h.c.F. Porsche Aktiengesellschaft, Robert Bosch GmbH, Zahnradfabrik Friedrichshafen AG

InventorsHeinz Stehle, Thomas Wehr, Joseph Petersmann, Willi Seidel, Ludwig Hamm, Thomas Foeldi, Udo Judaschke, Gerhard Eschrich, Ronald Schwamm, Wolfgang Runge, Wolf-Dieter Gruhle, Peter Wendel

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Abstract

In order to adapt the shifting characteristics of an electrohydraulically controlled, automatically shifting transmission continuously to the dirver's driving style or to a just existing or real time traffic situation, the driving speed (v), the lateral acceleration (aq), the longitudinal acceleration (alb), the longitudinal deceleration (alv) and the engine rotational speed (nmot) in addition to the throttle valve position alpha, are detected and by way of characteristic diagrams and a linking function are added to form a parameter from which, by filtering, a driving activity is determined. This driving activity is finally used for the selection of a shifting program from a plurality of shifting programs ranging from a consumption-optimized shifting program (SKF1) to a power-optimized shifting program (SKF5).

Claims65

Dependent claims

A method for controlling an automatically shifted transmission of a motor vehicle equipped with an internal combustion engine which is controllable by a power control element, configured as one of an accelerator pedal and a throttle valve, in which gear steps of said transmission are shifted automatically by one of at least two selectable shifting programs according to a function of at least sensed position of said throttle valve and of sensed engine rotational speed, comprising the steps of:

(a) one of cyclically and non-cyclically sampling and storing values of said throttle valve position,
(b) one of cyclically and non-cyclically sampling and storing values of said driving speed,
(c) sensing lateral acceleration of said motor vehicle,
(d) one of cyclically and non-cyclically sampling and storing values of said lateral acceleration,
(e) sensing longitudinal acceleration of said motor vehicle,
(f) one of cyclically and non-cyclically sampling and storing values of said longitudinal acceleration,
(g) sensing longitudinal deceleration of said motor vehicle,
(h) one of cyclically and non-cyclically sampling and storing values of said longitudinal deceleration,
(i) one of cyclically and on-cyclically sampling and storing values of said engine rotational speed,
(j) assigning a first primary parameter value to said values of said throttle valve position by a first characteristic diagram,
(k) assigning a second primary parameter value to said values of said engine rotational speed by a second characteristic diagram,
(l) assigning a third primary parameter value to said values of said lateral acceleration by a third characteristic diagram,
(m) assigning a fourth primary parameter value to said values of said longitudinal acceleration by a fourth characteristic diagram,
(n) assigning a fifth primary parameter value to said values of said longitudinal deceleration by a fifth characteristic diagram,
(o) linking said first, second, third, fourth and fifth primary parameter values to a secondary parameter value by a linking function,
(p) determining and storing a first driving activity to obtain a change-over strategy for one of selecting one of said selectable shifting programs and of a targeted changing of shifting decisions, whereby said first driving activity is determined by a weighted sum of said secondary parameter value and the value of said first driving activity determined at a time constituted by one earlier first calculating period.

13 more elements

A method for controlling automatically shifting transmission of a motor vehicle equipped with an internal combustion engine arranged to be influenced by a power control element constituted by one of an accelerator pedal and a throttle valve, comprising the steps of

a. automatically shifting gear steps of the transmission by shifting programs as a function of at least a position of a throttle valve and an engine rotational speed,
b. sensing a throttle valve signal proportional to the position of the throttle valve,
c. using to obtain a change-over strategy between the shifting programs the sensed throttle valve signal value for obtaining a change-over strategy between driving programs and at least one additional sensed parameter from a group of parameters comprising a driving speed signal value corresponding to a driving speed, a lateral acceleration signal value corresponding to a lateral acceleration, a longitudinal acceleration signal value corresponding to a longitudinal acceleration, a longitudinal deceleration signal value corresponding to a longitudinal deceleration, and an engine rotational speed signal value corresponding to the engine rotational speed,
d. converting the sensed parameters with at lest one of five characteristic diagrams to primary parameters values for use in a linking function,
e. obtaining from the linking function, a secondary parameter value,
f. storing the obtained secondary parameter value,
g. updating, with each newly obtained secondary parameter value, a number of previously obtained and stored secondary parameter values,
h. determining with weighting and formation of sums a first driving activity from stored values of the secondary parameter, and
i. using the first driving activity for one of the selection of one of the shifting programs and a targeted changing of shifting decisions in the automatic shifting of the transmission of the motor vehicle.

6 more elements

An apparatus for controlling an automatically shifting transmission of a motor vehicle equipped with an internal combustion engine controllable by a power control element constituted by one of an accelerator pedal and a throttle valve, comprising an electrohydraulic transmission control system, having shifting program modules, a microprocessor for detecting signals of at least one engine rotational speed sensor and a throttle valve sensor and, by way of the detected signals and the shifting program modules, for generating gear step change signals for controlling electrohydraulic gear step change valves, a driving speed sensor, a lateral acceleration sensor and a longitudinal acceleration sensor are operatively connected to the transmission control system, means for fitting the input signals with low-pass characteristic diagram modules for converting the filtered input signal into primary parameter values, a linking-function module for determining from the primary parameter values a secondary parameter, a digital filter with a low-pass characteristic converting the secondary parameter into a driving activity, and an additional characteristic diagram module from which one of several shifting programs is selected, wherein gear steps of the transmission are automatically shifted by shifting programs as a function of at least a position a throttle valve and of an engine rotational speed by sensing a throttle valve signal proportional to the position of the throttle valve, and to obtain a change-over strategy between the shifting programs, using the sensed throttle valve signal value and at least one additional sensed parameter from a group of parameters comprising a driving speed signal value corresponding to a driving speed, a lateral acceleration signal value corresponding to a lateral acceleration, a longitudinal acceleration signal value corresponding to a longitudinal acceleration, a longitudinal deceleration signal value corresponding to a longitudinal deceleration, and an engine rotational speed signal value corresponding to the engine rotational sped, converting the sensed parameters with at least one of five characteristic diagrams to primary parameter values, obtaining from a linking function, a secondary parameter value, determining and storing a first driving activity from a weighted sum of the obtained secondary parameter value and a value of a previously determined first driving activity in a first calculating period, and using the first driving activity for selection of one of a desired shifting program and a targeted changing of shifting decisions.

An apparatus for controlling an automatically shifting transmission of a motor vehicle equipped with an internal combustion engine controllable by one of an accelerator pedal and a throttle valve constituting a power control element, comprising an electrohydraulic transmission control system having shifting program modules, a microprocessor for detecting signals of at least one engine rotational speed sensor and a throttle valve sensor and, by way of the detected signals and the shifting program modules, for generating gear step change signals for controlling electrohydraulic gear step change valves, a driving speed sensor, a lateral acceleration sensor and a longitudinal acceleration sensor are operatively connected to the transmission control system, means for fitting the input signals with low-pass characteristic diagram modules for converting the filtered input signal into primary parameter values, a linking-function module for determining from the primary parameter values a secondary parameter, a digital filter with a low-pass characteristic converting the secondary parameter into a driving activity, and an additional characteristic diagram module operatively arranged from which one shifting program of several shifting programs is selected, wherein gear steps of the transmission are automatically shifted by shifting programs as a function of at least a position a throttle valve and of an engine rotational speed, by sensing a throttle valve signal proportional to the position of the throttle valve, using to obtain a change-over strategy between the shifting programs the senses throttle valve signal value for obtaining a change-over strategy between driving programs and at least one additional sensed parameter from a group of parameters comprising a driving speed signal value corresponding to a driving speed, a lateral acceleration signal value corresponding to a lateral acceleration, a longitudinal acceleration signal value corresponding to a longitudinal acceleration, a longitudinal deceleration signal value corresponding to a longitudinal deceleration, and an engine rotational speed signal value corresponding to the engine rotational speed, converting the sensed parameters with at least one of five characteristic diagrams to primary parameter values, obtaining from a linking function, a secondary parameter value, storing the obtained secondary parameter value, updating, with each newly obtained secondary parameter values, determining with weighting and formation of sums a first driving activity from a stored values of the second parameter, and using the first driving activity for the selection of one of a shifting program and a targeted changing of shifting decisions.

Dependencies are inferred from the claim text.