System for optimizing the fuel consumption of an internal combustion engine
AssigneeRobert Bosch GmbH
InventorFranz Maurer
Life of this patent
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Abstract
Optimum fuel consumption in an internal combustion engine driving a hydrostatic transmission having a continuously variable gear ratio is achieved by first applying the signal derived from the gas pedal directly to the transmission ratio regulator and, secondly, by controlling the fuel consumption of the engine in response to the gas pedal signal as follows: first, the signal from the gas pedal is multiplied by a signal signifying the output speed of the transmission. The so-formed desired power signal is applied to a storage which furnishes a desired engine speed signal in response thereto. The desired speed signal is compared to the actual engine speed and the resulting error signal, after amplification and integration, is applied to a unit controlling the fuel supply of the engine.
Claims6
In a motor vehicle having an internal combustion engine (18), first sensor means (17) connected to said internal combustion engine for furnishing an engine speed signal indicative of the speed thereof, hydrostatic transmission means connected to said internal combustion engine and having a continuously adjustable transmission ratio, second sensor means (13) coupled to said hydrostatic transmission means for furnishing an output speed signal indicative of the output speed thereof, means (21) connected to said internal combustion engine for adjusting the fuel supply of said internal combustion engine in accordance with a fuel control signal applied thereto, and means (2) for furnishing an input signal under external control,
- a system for minimizing fuel consumption of said internal combustion engine comprising
- means (4, 5) connected to said input signal furnishing means and said hydrostatic transmission means for adjusting said transmission ratio in response to said externally controlled input signal;
- means (11) connected to said input signal furnishing means and said second sensor means for multiplying said input signal by said output speed signal and furnishing a desired power signal corresponding to the so-multiplied values;
- storage means (15) connected to said multiplier means for furnishing a desired speed signal signifying the optimum engine speed for minimum fuel consumption in response to said desired power signal;
- means (16) connected to said storage means and said first sensor means for comparing said desired engine speed signal to said actual engine speed signal and furnishing a first error signal corresponding to the difference therebetween;
- and
- means (20) interconnected between said comparing means and said fuel supply adjusting means for furnishing said fuel control signal to said fuel supply adjusting means in response to said first error signal.
Dependencies are inferred from the claim text.