Process to evaluate cornering for an automatic gearbox

Details Process to evaluate cornering for an automatic gearbox Process to evaluate cornering for an automatic gearbox

1998-11-05

2001-07-10

Assouad, Patrick (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Mechanical measurement system

C702S034000, C702S145000, C701S037000, C701S048000, C477S034000, C477S046000

Reexamination Certificate

active

06259994

ABSTRACT:

The invention relates to a process for evaluating cornering in the automatic transmission of a vehicle by means of an electronic transmission control device having a calculation unit, a micro-controller, a memory device and a control device for starting up a hydraulic transmission control device. “Intelligent” gear change programs are known in the art for electro-hydraulically controlled automatic transmissions of passenger cars.
BACKGROUND OF THE INVENTION
One example of an intelligent gear change program has been described in DE-OS 39 22 051 wherein by “intelligent” it is understood that the driver of a vehicle needs not actuate any selector button for setting a certain gear change range, i.e., sporting drive or economic drive, since an electronic control device infers on the basis of input variables the behavior of the driver and thus the type of driver. For example, here the signal of a throttle valve, the speed of an internal combustion engine and both the longitudinal and transverse acceleration, as determined from the wheel speeds, serve as input variables. According to the prior art, a driving activity or a driver type is determined from the input variables. Based on the driver type an adequate gear change characteristic line is then selected from a plurality of gear change characteristic lines. Thus, for a slow drivertype, for example, a gear change characteristic line with low gear change points is selected, and for a sporting driver type, a gear change characteristic line with high gear change points is selected.
Since the behavior of a driver in different driving situations can be different, an otherwise sporting driver, for example, who in curves prefers a slower drive, would find inappropriate in the above mentioned driving situation to have his driving behavior in general classified as sporting. The gear change program must therefore be able to flexibly react to different driving situations.
German patent 41 20 603 has disclosed a process relative to cornering in which an upshift is admissible only when the transverse acceleration is below a limit value.
This process known from the prior art thus has the disadvantage that when cornering with a high transverse acceleration even though a gear change is eliminated, the driving activity or the type of driver is not evaluated.
SUMMARY OF THE INVENTION
The problem solved by this invention is to provide a process by which a driver type is evaluated even when cornering.
According to the invention there is provided a process for evaluation of cornering in an automatic transmission of a vehicle by means of an electronic transmission control device having a calculation unit, a micro-controller, a memory device and a control device for start-up of a hydraulic transmission control device, characterized by the following steps: 1) from wheel speeds (n_Rad) measured by a measuring device (
34
) on wheels of the vehicle, a transverse acceleration (a_Quer) of the vehicle is determined in first processing operation (S
1
) by the calculation unit (
30
); 2) in one other processing operation (S
2
) a driver-type theoretical value (FT_Soil) is determined from the vehicle transverse acceleration (a_Quer) and a vehicle speed (V_F); and 3) from an increment (INKR) between the driver-type theoretical value (FT_Soll) and a driver-type actual value (FT_Ist) a gear change characteristic line (SL) is determined from several gear change characteristic lines each one associated with a certain driver type or cornering style.
The process according to the invention has the added advantage that the actual driver-type value used in the process is always kept on the actually last state.


REFERENCES:
patent: 4679145 (1987-07-01), Beeck et al.
patent: 5025684 (1991-06-01), Stehle et al.
patent: 5099720 (1992-03-01), Raue
patent: 5157609 (1992-10-01), Stehle et al.
patent: 5235876 (1993-08-01), Minowa et al.
patent: 5265019 (1993-11-01), Harara et al.
patent: 5513108 (1996-04-01), Kishimoto et al.
patent: 5947862 (1999-09-01), Knapp et al.
patent: 33 41 652 A1 (1985-06-01), None
patent: 39 22 051 C2 (1991-01-01), None
patent: 41 20 603 C2 (1993-01-01), None
patent: 43 12 717 A1 (1993-11-01), None
patent: 0 471 102 A1 (1992-02-01), None
patent: 0 638 742 A1 (1995-02-01), None
patent: 95/20114 (1995-07-01), None
ATZ Automobiltechnische Zeitschrift95 (1993) Die Adaptive Getriebesteuerung für BMW-Automobile by Andreas Welter, Friedrich Renoth and Emanuel Fuchs, pp. 420-434 (No translation).
ATZ Automobiltechnische Zeitschrift97 (1995) “Die elektronische Steuerung des automatischen Getriebes W5A 330/580 von Mercedes-Benz” by Rudolf Rösch and Gerhard Wagner, pp. 736-748, (No translation).

Affiliated with

Also associated with

Rating

Process to evaluate cornering for an automatic gearbox does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process to evaluate cornering for an automatic gearbox, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process to evaluate cornering for an automatic gearbox will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2470906