Motor vehicle with reduced sound emissions
A heavy goods vehicle or omnibus motor vehicle with reduced sound emissions, having a diesel engine, the operation of which can be regulated by an injection pump by an engine electronics unit which includes a microprocessor, a data and program store and input and output peripherals. Measures for at least temporarily reducing the sound emissions by the engine can be carded out to and/or at a level preferably prescribed by legislation, by regulating operation of the engine such that free and/or additional data storage locations that need to be provided in the engine electronics unit switch to a reduced-noise mode, the effect of which at least temporarily increases consumption and at the same time is at least approximately constant in terms of power and rotation speed, and which reduces the emission of sound from the drive and/or engine, in particular the reduced-noise mode lowers the rail pressure, defers the injection to a later time and/or provides a greater volume of subsets in the fuel metering.
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.
2. The motor vehicle with reduced sound emissions according to claim 1 , wherein the reduced-noise mode lasts for a maximum period of 5 minutes and subsequently changes back to a normal mode.
3. The motor vehicle with reduced sound emissions according to claim 1 , wherein the engine control unit is configured to poll a state of an exhaust-gas aftertreatment system before or during the reduced-noise mode and, in particular when one of a decline in the conversion rates of the catalytic converter and a fill-level limit value for the particle filter, indicated by the exhaust-gas back-pressure, is exceeded, the engine control unit changes back to the normal mode and/or remains in the normal mode.
4. The motor vehicle with reduced sound emissions according to claim 3 , wherein the decline in the conversion rates of the catalytic converter is between 10 and 50%, and/or the fill level limit value indicated by the exhaust-gas back-pressure is between 60 and 400 mbar.
5. The motor vehicle with reduced sound emissions according to claim 1 , wherein in the reduced-noise mode the pre-injection quantity is raised in comparison with the normal mode and/or in that in the reduced-noise mode the exhaust-gas recirculation rate is maintained or increased in comparison with the normal mode.
6. The motor vehicle with reduced sound emissions according to claim 1 , wherein the reduced-noise mode starts on the basis of one of a predefined rotation speed value in the range of 33 to 90% of the nominal rotation speed of the engine, a threshold value detected at a microphone on the motor vehicle being exceeded, an actual-speed and/or actual-acceleration threshold value being exceeded, a limit range for gearbox speed and engine rotation speed being exceeded and a combination of two or more of the aforementioned events.
7. The motor vehicle with reduced sound emissions according to claim 6 , wherein the actual-speed threshold value for heavy goods vehicles is between 30 and 70 km/h and in that the limit range of the gear ratio is greater than 2:1 and less than 6:1.
8. The motor vehicle with reduced sound emissions according to claim 6 , wherein the acceleration threshold value is dependent on a loading of the vehicle.
9. The motor vehicle with reduced sound emissions according to claim 1 , wherein the engine electronics unit is configured to wait at least a period of 5 minutes between two successive low-noise mode phases.
10. The motor vehicle with reduced sound emissions according to claim 1 , wherein the engine electronics unit carries out a first degree of sound reduction out during the reduced-noise mode if the vehicle is in a first surface section and 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.
11. The motor vehicle with reduced sound emissions according to claim 1 , wherein at least one first threshold value is used for instigating at least a low-noise mode when the motor vehicle is in a first surface section and a second threshold value is used for instigating at least a low-noise mode when the motor vehicle is in a second surface section, the first and second threshold values being different.
12. The motor vehicle with reduced sound emissions according to claim 1 , wherein a presence of the motor vehicle in the first surface section, the second surface section or a further surface section is determined or stipulated by one of a GPS system, a locating system, an optical system, a vehicle communication system, a mobile radio, a smartphone, a broadcast radio system, a radar system, an infrared system, a map system and by a manual input by a driver.
13. The motor vehicle with reduced sound emissions according to claim 12 , further comprising the optical system, wherein the optical system is configured to detect buildings, landscapes, road signs and/or moving objects in the environment of the vehicle and, on the basis of these detected objects, selects one of at least two different surroundings categories, the selected surroundings category being taken as a basis for varying the degree of sound reduction and/or the threshold value for instigating the reduced-noise mode.
14. The motor vehicle with reduced sound emissions according to claim 1 , wherein at least one of a degree of sound reduction and the threshold value for instigation of the reduced-noise mode varies on the basis of one of:
values from a weather, moisture or rain sensor on the vehicle;
weather conditions associated with the location of the vehicle; and
weather information detected by an optical sensor.
15. The motor vehicle with reduced sound emissions according to claim 1 , wherein the reduced-noise mode lasts for a maximum period of 2 minutes and subsequently changes back to a normal mode.
16. The motor vehicle with reduced sound emissions according to claim 1 , wherein the reduced-noise mode lasts for a maximum period of 40 seconds and subsequently changes back to a normal mode.
17. The motor vehicle with reduced sound emissions according to claim 3 , wherein the decline in the conversion rates of the catalytic converter is between 12 and 15%.
18. 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 control unit is configured to poll a state of an exhaust-gas aftertreatment system before or during the reduced-noise mode and, in particular when one of a decline in the conversion rates of the catalytic converter and a fill-level limit value for the particle filter, indicated by the exhaust-gas back-pressure, is exceeded, the engine control unit changes back to the normal mode and/or remains in the normal mode, and
wherein the fill level limit value indicated by the exhaust-gas back-pressure is between 150 and 250 mbar.
19. The motor vehicle with reduced sound emissions according to claim 6 , wherein the actual-speed threshold value for heavy goods vehicles is between 39 and 61 km/h.
20. The motor vehicle with reduced sound emissions according to claim 6 , wherein the limit range of the gear ratio is greater than 2:1 and less than 6:1.
21. The motor vehicle with reduced sound emissions according to claim 1 , wherein the engine electronics unit is configured to wait at least a period of 2 minutes between two successive low-noise mode phases.
22. The motor vehicle with reduced sound emissions according to claim 1 , wherein the engine electronics unit is configured to wait at least a period of 30 seconds between two successive low-noise mode phases.
23. The motor vehicle with reduced sound emissions according to claim 1 , wherein the motor vehicle is a heavy goods vehicle or omnibus and the engine is a diesel engine.
24. A method for influencing the emission of sound by a motor vehicle having a drive and an engine, the operation of which can be regulated using measures for at least temporarily reducing the sound emissions by the engine to or at a level preferably prescribed by legislation, comprising:
switching an engine electronics unit to a reduced-noise mode from a normal mode, and
at least one of lowering the rail pressure, deferring the injection to a later time and providing a greater volume of subsets in fuel metering compared to a normal mode, the effect of which increases consumption at least in phases while maintaining at least approximately constant power and rotation speed, and reduces the emission of noise from the drive and/or the engine, wherein a first degree of sound reduction is carried out if the vehicle is in a first surface section and a second degree of sound reduction is carried out 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 a chosen measurement interval.
25. A method for influencing the emission of sound by a motor vehicle having a drive and an engine, the operation of which can be regulated using measures for at least temporarily reducing the sound emissions by the engine to or at a level preferably prescribed by legislation, comprising:
switching an engine electronics unit to a reduced-noise mode from a normal mode, and
at least one of lowering the rail pressure, deferring the injection to a later time and providing a greater volume of subsets in fuel metering compared to a normal mode, the effect of which increases consumption at least in phases while maintaining at least approximately constant power and rotation speed, and reduces the emission of noise from the drive and/or the engine,
polling a state of an exhaust-gas aftertreatment system before or during the reduced-noise mode and, in particular when one of a decline in the conversion rates of the catalytic converter and a fill-level limit value for the particle filter, indicated by the exhaust-gas back-pressure, is exceeded, changing back to the normal mode and/or remaining in the normal mode, wherein the fill level limit value indicated by the exhaust-gas back-pressure is between 150 and 250 mbar.