DE102004001382A1 - Automatic gearbox`s adaptation frequency increasing method for motor vehicle, involves extending access/interruption criterion for next adaptation process, when no evaluation necessitating adaptation takes place over period of time - Google Patents

Abstract

in the Framework of the procedure for increase the frequency of adaptation in an automatic transmission of a motor vehicle, when detected too small a frequency of occurrence of adaptation functions by failing to meet certain entry criteria or upon detecting an inhibition of adaptation scores by the Achievement of termination criteria during the adaptation process, these criteria detected and in the transmission control stored, with, if over a certain time no adaptation evaluation is performed, that for non-activation or for responsible for stopping the adaptation Expansion criterion or termination criterion is expanded for a next adaptation process, whereby an adaptation value determination is made possible.

Description

The The present invention relates to a method for increasing the adaptation frequency in an automatic transmission of a motor vehicle according to the preamble of claim 1

The increasing demands to the functionality the automatic transmission - both in new condition as well as during the entire life - through the demand for more spontaneity and increased shift quality, always increasing number the gears to be switched but also the raised ones Efficiency requirements require a commissioning and at the beginning of the term of an automatic transmission very fast reacting and over The runtime accurate adaptation system to get the circuits fast and permanently exactly the tolerances, which are partly increased by the claims to optimize accordingly.

To In the prior art, there are different ones for the quantities to be adapted adaptation options or adaptation functions, wherein for a variable to be adapted respectively one of these adaptation options can be activated. Furthermore, entry conditions are for each adaptation function provided that limit the operating range in which a more accurate Adaptation value that ensures the appropriate shift quality, is reachable.

By Driver habits, use of the vehicle under extreme conditions, Environmental conditions or activation of replacement or replacement signals Failure of important signals / sensors can cause them to fail Restriction on narrow operating ranges disadvantageously too low Occurrence or activation frequency of adaptation functions and in extreme cases to deactivation of adaptation functions or permanent aborts during the adaptation evaluations come.

The following Entry conditions for the call of the adaptations can be stored for example in the transmission software: transmission temperature, engine temperature, Engine speed, output speed, turbine speed, throttle position etc. Furthermore, can Vehicle dynamics limits or operating conditions via e.g. the gradient of Throttle position, torque and / or speed for activation of adaptation functions. Also, the quality of the signal, For example, the signal of the wheel speed when driving on low friction (e.g., ice track) an operating condition for corresponding ones Adaptation functions.

Usually are adaptation functions only in the transmission temperature range (transmission oil temperature) activated between 60-120 ° C. However, this temperature can never be reached if e.g. the driver only short distances and the vehicle only moves in the winter. Under these circumstances, none would Adaption can be called because the "normal" entry conditions are not reached become. That is, the vehicle can not tolerate the existing tolerances compensate for optimum shifting comfort.

One Another example of a situation where the adaptation functions can not be activated arises when the driver drives very nervous or unsteady, as usual is then adapted when the vehicle is in a "static Condition "is.

at Often the change is the adaptation Output speed gradient used as input value. if e.g. the road surface is too uneven, no adaptation is performed because the speed signal is not sufficiently stable.

The same applies to engine-specific signals or entry conditions in engine control, the vehicle dynamics control, the ABS, the ACC, or other vehicle systems with appropriate adaptations.

Of the The present invention is based on the object, a method specify, by means of which the adaptation frequency of transmission components increased or a certain frequency of adaptation is reached. In particular, the method is intended to carry out Enable adaptations in situations in which according to the prior art adaptation functions aborted or not activated.

These The object is solved by the features of claim 1. Further Variants and advantages will become apparent from the dependent claims.

Accordingly, it is proposed to detect these criteria and to store them in the transmission control when a too low occurrence frequency of adaptation functions is detected by failing to meet certain entry criteria or when recognizing a prevention of adaptation evaluations by the achievement of termination criteria during the adaptation procedure, if, over a certain period of time no adaptation valuation is carried out, the entry criterion or cancellation criterion for the next non-activation or abort of the adaptation Expansion process is expanded, whereby an adaptation value determination is made possible.

Preferably the widening of a criterion occurs by increasing the permissible value range or is moved. For example, if the frequency of adaptation is too low due to low temperatures the temperature range for the adaptation either expanded or accordingly in the direction of lower temperatures be moved.

A too low adaptation frequency can e.g. by an absolutely too low number of evaluations or also due to the low valuation frequency in a particular Period, during one certain transmission time or for a certain number of switching operations be recognized. Also too long a distance to the last determined Adaptation value or excessive deviation from this may be too a faster needed Repeat the adaptation lead.

If about one certain time no adaptation evaluation is performed, then, as already explains that for the inactivation or for the Demolition of adaptation responsible Expanded entry criterion or termination criterion for a next adaptation procedure, whereby an adaptation value determination is made possible. This adaptation utilization determination does not represent the best possible Accuracy is, however, is suitable, occurring due to tolerances or wear Almost compensate for deviations.

Of Another can be done by widening the operating range existing uncertainty or danger of too strong adaptation evaluation and thus reducing misadaptation, the value determined over a Factor later influenced or weakened become. Subsequently this value is stored as an adaptation value in the transmission control and used to improve the shift quality for the next circuits.

at Failure of for the adaptation of necessary signals and transmission of substitute signals, but not the goodness reach the original signal, according to the invention also an expansion of the area can be performed. It can also be provided be that size, for the replacement signals generated is ignored.

at Adaptations, at least during the actual evaluation a certain requirement is placed on a constant operating point, however, this is not sufficiently long due to driver habits, is in the context of the method according to the invention provided by a greater variance the entry or termination criteria an increase in the frequency of adaptation to achieve.

at Adaptations, for the for the assessment of a corresponding accuracy to the transmission output speed signal or to the transmission speed input signal, these Accuracy, however, due to poor road surfaces or engine irregularities can not be achieved according to the invention also the speed ranges widened or the signals are filtered more strongly. In an advantageous variant of the method is provided the driver, for example, over Notes in a display to point out this problem to him the possibility to give, to respond. Alternatively or additionally this over the workshop be notified to the diagnostic tester.

The inventive method can also be advantageous for the case of a transmission exchange be applied to the adaptation target as soon as possible to reach.

Claims (7)

A method for increasing the frequency of adaptation in an automatic transmission of a motor vehicle, characterized in that when detecting a low frequency of occurrence of adaptation functions by not reaching certain entry criteria or recognizing a prevention of adaptation ratings by the achievement of termination criteria during the adaptation process, detects these criteria and in the Transmission control are stored, wherein, if over a certain time no adaptation evaluation is performed, which is responsible for the non-activation or for aborting the adaptation entry criterion or termination criterion for a next adaptation process is expanded, whereby an adaptation value determination is made possible. Method according to claim 1, characterized in that that the widening of a criterion takes place in that the permissible value range enlarged or is moved. Method according to claim 1 or 2, characterized that too low a frequency of occurrence of adaptation functions by failing to meet certain entry criteria or prevention of adaptation ratings by achievement of termination criteria during the adaptation process by an absolutely too low number of evaluations, due to a too low evaluation or adaptation frequency during a certain period of time a certain transmission lifetime or for a certain number of Switching operations detected becomes. Method according to claim 1 or 2, characterized that too low a frequency of occurrence of adaptation functions due to excessive deviation from the last detected adaptation value is detected. Method according to one of the preceding claims, characterized characterized in that one by the widening of the operating range existing uncertainty or risk of over-adaptation and thus to avoid misadaptation, the determined adaptation value via a Factor later influenced or weakened becomes. Method, characterized in that at failure from for the adaptation of necessary signals and transmission of substitute signals, expanded the entry or exit criteria for the next adaptation process become. Method according to one of the preceding claims, characterized characterized in that, when adapted for adaptation, a constant operating point or a certain signal accuracy is required, which can not be achieved are an adaptation through a greater variance of entry-level or abort criteria performed becomes.