Interrelated power delivery controls – including engine control – Transmission control – Transmission controlled by engine
Patent
1999-01-12
2000-07-11
Marmor, Charles A
Interrelated power delivery controls, including engine control
Transmission control
Transmission controlled by engine
477107, 477111, 477902, 701123, F16H 5934
Patent
active
060865113
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The invention relates to a device as claimed in the preamble of patent claim 1.
The motor vehicle industry has been making increasing efforts to reduce the fuel consumption of its vehicles for several years. For this purpose, the industry has set itself targets which have become known under the slogan "3 liter car" for example. A "3 liter car" is understood to be a car which does not consume more than 3 liters of fuel, petrol or diesel per 100 kilometers during the normal driving cycle.
A device for limiting the fuel consumption is already known, said device having an input component for the setpoint value of kilometer-specific fuel consumption, i.e. for example the setpoint value 7 liters per 100 kilometers can be input and stored in a memory (DE-A 27 19 209). A fuel flow throttle which is arranged in the fuel path and an air intake throttle which is arranged in the air intake path are set as a function of the setpoint value which has been set. The two throttles are consequently adjusted in such a way that the same fuel consumption per 100 kilometers is always obtained. A disadvantage with this inflexible presetting of the fuel consumption is that, for example, the 7 liters per 100 kilometers which has been set is consumed even if a lower fuel consumption would have been possible. The setpoint value which is set is thus simultaneously a minimum value and a maximum value.
It is also known to measure the instantaneous power which is output by batteries in electric motors, and compare it with a preset value (EP 0 610 682 A1). If this comparison reveals that the instantaneous power is lower than a preset maximum power, the motor is adjusted upward to the preset power. However, if the instantaneous power is higher than the preset maximum power, the motor is adjusted downward to the preset power. Therefore, adjustment is carried out here to a specific power value. For the rest, the conditions in electrometers are not comparable to the conditions in internal combustion engines insofar as electric motors do not require any gear speed shifting operations. Furthermore, the fuel consumption values are different in the individual gear speeds.
In a known device for apportioning the fuel/air mixture for an internal combustion engine for adjusting to a minimum specific fuel consumption value it is known to use the engine speed and the fuel apportioning signal as actual information (DE-A 34 03 394). The setpoint values can be preset here as a function of the selected gear speed of the transmission which is connected to the internal combustion engine. The adjustment to minimum fuel consumption does not, however, bring about any limitation to a specific instantaneous fuel consumption value here, but instead it can exceed any preset value if the lowest possible fuel consumption occurs only at the power level which is output. It is not intended here that there should be power limitation which can occur during a limitation of the apportionment of the fuel.
In addition, a consumption measuring and closed-loop control device is known preferably for diesel engines, said device having at least a flow meter and a display device (DE-A 33 35 650). In this device, the fuel consumption is measured and the average consumption and/or the overall consumption per time unit is displayed in conjunction with a vehicle-mounted computer, and when the values deviate from preset values the consumption of the engine is adjusted. By virtue of the fact that the open-loop and closed-loop control device is additionally influenced by the engine speed (cf. also DE-A 34 00 513), the closed-loop control can be performed by means of influencing variables, it being impossible to achieve this control solely by measuring the flow. However, the engine speed is not a suitable criterion because, without additional information, it does not provide any indication of the gear which is currently selected.
In another known control device for an internal combustion engine, both the fuel quantity and the acceleration or deceleration can be measured (DE-A
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Agentur Droge GmbH
Ho Ha
Marmor Charles A
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