Patent ID: 9200579
Filing Date: 2015-12-01
Classification: F02D

Abstract:
1. A motor vehicle with reduced sound emissions, comprising: an engine and a drive; an injection pump; and an engine electronics unit which comprises a microprocessor, a data and program store and input and output peripherals, wherein a regulation of an operation of the engine is performed by the injection pump and by the engine electronics unit, and the engine electronics unit being switchable between a normal mode and a reduced noise mode, wherein free or additional data store areas are used by the engine electronics unit in the reduced-noise mode in which at least one of a rail pressure is lowered, injection is deferred to a later time, and a greater volume of subsets is provided in fuel metering, compared to the normal mode, the effect of which at least temporarily increases consumption while at the same time maintains at least approximately constant power and rotation speed, and reduces the emission of sound from the drive and/or engine in the reduced-noise mode, wherein the engine electronics unit carries out a first degree of sound reduction during the reduced-noise mode if the vehicle is in a first surface section and carries out a second degree of sound reduction during the reduced-noise mode if the motor vehicle is in a second surface section, the first and second degrees of sound reduction being different and having at least a delta of 3 dB sound pressure at the chosen measurement interval.