Boots – shoes – and leggings
Patent
1985-05-08
1988-03-15
Gruber, Felix D.
Boots, shoes, and leggings
3644241, B60K 4118, B60Q 900, G09B 1916
Patent
active
047317272
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for determining the optimal gear, in terms of fuel consumption, of a motor vehicle drive which adapts itself as it learns how the vehicle responds to the particular driver, road conditions, and engine condition encountered during a drive. The invention also relates to a circuit for performing the method.
BACKGROUND
In a known circuit arrangement for controlling a gear shift indicator of a motor vehicle drive, threshold limit values, ascertained for each gear by the vehicle manufacturer, for shifting into the next-higher gear are fed into an electronic read-only memory. During vehicle operation, the speed values and gas pedal positions that are ascertained on a continuous basis are compared with the threshold or limit values in a computer, and if the limit values are exceeded, a signal for shifting to a higher gear is triggered (German Patent Disclosure Document, laid open No. DE OS 31 28 080 Feb. 3, 1983). This arrangement has the disadvantage that the threshold or limit values must be ascertained for each vehicle type in accordance with the gear ratios of the gear steps and in accordance with the engine's power rating, based on an assumption that the engine is optimally tuned. Since after breaking in, engines may already have considerable fluctuations in power as compared with the rated value, and since in the course of time further power fluctuations are brought about by adjustments of the ignition or the carburetor or fuel injection pump, the threshold values ascertained by the manufacturer for gear shifting may be only approximate values. Furthermore, this method does not take into consideration changing load conditions or the grade of the roadway while driving when indicating a shift into a higher gear.
With the present invention, the object is to develop a method for determining the threshold values for shifting gears which enables optimum power at minimum fuel consumption, regardless of the size of the engine, the vehicle load or the gear ratios.
THE INVENTION
The method according to the invention for determining the optimum gear for fuel consumption has the advantage that the limit or threshold values, of gas pedal position and engine speed that are required for shifting gears, are ascertained only after the circuit has been installed in the motor vehicle and during a first distance driven. Consequently, such a system is generally applicable in all vehicle types, without having to make any adaptations or changes. It determines the vehicle-specific and hence correspondingly accurate threshold values for fuel consumption-optimal gear shifting, and after the shifting has been done at least the same power can be made available by the driving motor as before. A further advantage is that in accordance with the method according to the invention and the circuit required for it, the driving performance of the driver is also taken into consideration in determining the threshold or limit values. By measuring a so-called standardized power prior to and following gear shifting, different threshold values will be determined and stored in memory in the case of a skilled driver, who needs only a short time for shifting, than in the case of a driver who needs a longer time to shift into the new gear.
Briefly, it is particularly advantageous if for each gear, in the area of a threshold value memory associated with it, the threshold values that have been determined are stored in a memory matrix laid out in steps in accordance with the engine speed and the gas pedal position. After the threshold values have been determined and stored in memory, the instantaneous values for engine speed and gas pedal position are compared with the threshold value for the gear presently engaged that are stored in the threshold value memory, so that a signal for upshifting can be triggered whenever the instantaneous values exceed the threshold values in the direction of an operating zone that is unfavorable in terms of fuel consumption.
The circuit for performing the method, has the advantage that
REFERENCES:
patent: 4198882 (1980-04-01), Kiencke et al.
patent: 4208925 (1980-06-01), Miller et al.
patent: 4398910 (1983-06-01), Lockhart
patent: 4411174 (1983-10-01), Yokoi et al.
patent: 4463427 (1984-07-01), Bonnetain et al.
patent: 4492112 (1985-01-01), Igarashi et al.
patent: 4517646 (1985-05-01), Magnusson et al.
patent: 4559599 (1985-12-01), Habu et al.
Rauch Hans
Wesemeyer Jurgen
Gruber Felix D.
Robert & Bosch GmbH
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