EP1687173A1 - Method for reducing the fuel consumption of a motor vehicle - Google Patents

Method for reducing the fuel consumption of a motor vehicle

Info

Publication number
EP1687173A1
EP1687173A1 EP04804532A EP04804532A EP1687173A1 EP 1687173 A1 EP1687173 A1 EP 1687173A1 EP 04804532 A EP04804532 A EP 04804532A EP 04804532 A EP04804532 A EP 04804532A EP 1687173 A1 EP1687173 A1 EP 1687173A1
Authority
EP
European Patent Office
Prior art keywords
vehicle
driver
speed
request
vehicle speed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP04804532A
Other languages
German (de)
French (fr)
Inventor
Ralph Gronau
Jürgen WOYWOD
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Continental Teves AG and Co OHG
Original Assignee
Continental Teves AG and Co OHG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE102004048494A external-priority patent/DE102004048494A1/en
Application filed by Continental Teves AG and Co OHG filed Critical Continental Teves AG and Co OHG
Publication of EP1687173A1 publication Critical patent/EP1687173A1/en
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K31/00—Vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed, i.e. preventing speed from exceeding an arbitrarily established velocity or maintaining speed at a particular velocity, as selected by the vehicle operator
    • B60K31/02—Vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed, i.e. preventing speed from exceeding an arbitrarily established velocity or maintaining speed at a particular velocity, as selected by the vehicle operator including electrically actuated servomechanism including an electric control system or a servomechanism in which the vehicle velocity affecting element is actuated electrically
    • B60K31/04—Vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed, i.e. preventing speed from exceeding an arbitrarily established velocity or maintaining speed at a particular velocity, as selected by the vehicle operator including electrically actuated servomechanism including an electric control system or a servomechanism in which the vehicle velocity affecting element is actuated electrically and means for comparing one electrical quantity, e.g. voltage, pulse, waveform, flux, or the like, with another quantity of a like kind, which comparison means is involved in the development of an electrical signal which is fed into the controlling means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2520/00—Input parameters relating to overall vehicle dynamics
    • B60W2520/10—Longitudinal speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2530/00—Input parameters relating to vehicle conditions or values, not covered by groups B60W2510/00 or B60W2520/00
    • B60W2530/16—Driving resistance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2540/00—Input parameters relating to occupants
    • B60W2540/10—Accelerator pedal position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2540/00—Input parameters relating to occupants
    • B60W2540/10—Accelerator pedal position
    • B60W2540/106—Rate of change
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2552/00—Input parameters relating to infrastructure
    • B60W2552/15—Road slope, i.e. the inclination of a road segment in the longitudinal direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2555/00—Input parameters relating to exterior conditions, not covered by groups B60W2552/00, B60W2554/00
    • B60W2555/20—Ambient conditions, e.g. wind or rain
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • the invention relates to a method for reducing the fuel consumption of a motor vehicle.
  • the object is achieved in that a driver's request for a uniform vehicle speed is determined and that when the driver's request for a uniform vehicle speed has been recognized, the Vehicle speed changes, which are not prompted by the driver, are at least partially corrected for the lowest possible fuel consumption, such as gasoline or diesel fuel, of the drive motor of the vehicle.
  • the uniformity of driving is improved as an important factor for an energy-saving driving style. This means that acceleration and deceleration processes should be reduced to the necessary extent.
  • This method is particularly preferably used for vehicles with a gasoline direct injector or diesel engines as the drive motor, which have particular advantages in terms of consumption in part-load operation.
  • the vehicle should react to changes in the accelerator pedal position as before (without consumption-optimized control according to the method of the invention) if the traffic situation requires it and if it corresponds to the driver's request.
  • this solution advantageously does not "force" any other general driving behavior on this solution.
  • the automatic intervention in the vehicle control by the method according to the invention is not regarded as patronizing for the driver and can be accepted more easily by the driver.
  • Driving resistance change is at least partially corrected.
  • a change in the inclination of the road in the longitudinal direction of the vehicle such as a road gradient or gradient, or a change in weather conditions, in particular changing speeds of atmospheric wind, or driving conditions, such as changing inflow angles of the vehicle in a slipstream of another Vehicle or object, and / or cornering is taken into account.
  • the driver's desire for a uniform vehicle speed is recognized on the basis of the accelerator pedal movement (accelerator pedal movement).
  • a vehicle speed resulting from this position of the accelerator pedal is recognized as a desired speed representing the driver's request.
  • a period of time in a range from 1 seconds (sec) to 8 seconds, preferably approximately 5 seconds, is specified.
  • the desired speed representing the driver's request is stored.
  • the current vehicle speed is compared with the desired speed representing the driver's request and, if the current vehicle speed deviates from the desired speed, the vehicle is automatically accelerated, decelerated or braked to reduce the deviation, essentially similar to a function of a vehicle Cruise control with brake intervention option.
  • the automatic acceleration or the automatic braking of the vehicle is carried out in such a way that the lowest possible fuel consumption for the drive motor of the vehicle, such as gasoline or diesel fuel, is required.
  • the automatic acceleration or the automatic braking of the vehicle can be carried out in such a way that acceleration or braking operations that are as comfortable as possible for the driver result.
  • the vehicle is automatically accelerated or braked if the deviation of the current vehicle speed from the desired speed is greater than 0.2 km / h to 2 km / h.
  • a vehicle has a vehicle control and regulating unit which can automatically influence the vehicle deceleration by "accelerating” and / or “brake pressure build-up” and the vehicle acceleration by "accelerating” and / or “brake pressure reduction”.
  • the driver's request for constant travel can be opposed to certain, often changing driving resistance situations during the journey.
  • the second important change in driving resistance which the driver cannot directly detect, is the change in air resistance caused by driving in the slipstream or changing inflow angles and / or changing speeds of the atmospheric wind can.
  • This change in driving resistance is corrected according to the invention by the method according to the invention.
  • the driving resistance also increases due to cornering and the associated slip slip. This increase is considered to be of minor importance. This change in driving resistance is also corrected according to the invention by the method according to the invention.
  • the driver's desire to drive a constant speed is realized by monitoring the accelerator pedal position (pedal position).
  • the speed then determined is saved. According to the invention, it is assumed that this determined speed represents the desired speed.
  • the current vehicle speed is constantly compared with the stored speed (desired speed). If a deviation of 0.2 km / h to 2 km / h is detected, the engine torque is changed by this Minimizing the deviation means "correcting" in the sense of the invention.
  • the monitoring does not allow any deviations that are noticeable to the driver. Therefore, the likelihood of inefficient intervention by the driver is significantly reduced.
  • Accelerator pedal movements d. H. Vibrations of the accelerator pedal that are greater than 1 Hz, i.e. movements more than once per second, are not used to change the desired speed. These accelerator pedal movements are considered a disturbance.
  • Rapid accelerator pedal movements in one direction and with a clear amplitude, which remain in one position at the end, are also implemented immediately and viewed as a driver request after a short monitoring time.
  • the change in torque which is permitted by the regulation of the desired speed, does not include the entire torque available by the motor, but only changes from + 10% to + 40% of the initial torque (torque that was applied when the desired speed was saved) , This always gives the driver the opportunity to actively accelerate or apply drag torque.
  • the predominant savings potential lies at higher speeds (greater than 60 km / h to 70 km / h). Constant speeds are more common in these speed ranges than in city trips. The method is therefore preferably used at vehicle speeds greater than approximately 60 km / h to 70 km / h.

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Mathematical Physics (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
  • Controls For Constant Speed Travelling (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The invention relates to a method for reducing the fuel consumption of a motor vehicle. According to said method, a driver's request for a uniform vehicle speed is determined and once said request has been identified, the modifications to the vehicle speed, which are not initiated by the driver, are at least partially adjusted to obtain the lowest possible fuel consumption, for example of petrol or diesel, for the engine of the vehicle.

Description

Verfahren zur Verringerung des Kraftstoffverbrauchs eines Kraftf hrzeugs Method for reducing the fuel consumption of a motor vehicle
Die Erfindung bezieht sich auf ein Verfahren zur Verringerung des Kraftstoffverbrauchs eines Kraftfahrzeugs .The invention relates to a method for reducing the fuel consumption of a motor vehicle.
Aufgrund ständig steigender Energiepreise richtet sich ein besonderes Interesse auf den Kraftstoffverbrauch von Fahrzeugen. Eine Verringerung des Kraftstoffverbrauchs heutiger Fahrzeuge wird immer wichtiger.Due to constantly increasing energy prices, there is a particular interest in the fuel consumption of vehicles. Reducing the fuel consumption of today's vehicles is becoming increasingly important.
Weiterentwicklungen von Antriebsmotoren, Verringerungen von Luftwiderstand oder Rollwiderstand und andere verbrauchmindernde Verbesserungen können das vorhandene Potential der möglichen Verbrauchreduzierung aber nur teilweise ausnutzen.Further developments of drive motors, reductions in air resistance or rolling resistance and other consumption-reducing improvements can only partially utilize the existing potential of reducing consumption.
Weitere, vergleichsweise große Einsparungen sind im Grundsatz nur durch eine energiesparende Fahrweise möglich.In principle, further, comparatively large savings are only possible through an energy-saving driving style.
Es ist die Aufgabe der Erfindung, die Fahrzeugregelung im Hinblick auf energiesparendes Fahren zu verbessern.It is the object of the invention to improve vehicle control with regard to energy-saving driving.
Die Aufgabe wird durch die unabhängigen Patentansprüche gelöst. Bevorzugte Ausführungsformen sind in den Unteransprüchen angegeben.The task is solved by the independent claims. Preferred embodiments are specified in the subclaims.
Die Aufgabe wird dadurch gelöst, dass ein Fahrerwunsch nach einer gleichmäßigen Fahrzeuggeschwindigkeit ermittelt wird und dass wenn der Fahrerwunsch nach einer gleichmäßigen Fahrzeuggeschwindigkeit erkannt wurde, die Fahrzeuggeschwindigkeitsänderungen, die nicht durch den Fahrer veranlasst sind, im Hinblick auf einen möglichst geringen Kraftstoffverbrauch, wie Benzin oder Dieselkraftstoff, des Antriebsmotors des Fahrzeugs zumindest teilweise ausgeregelt werden.The object is achieved in that a driver's request for a uniform vehicle speed is determined and that when the driver's request for a uniform vehicle speed has been recognized, the Vehicle speed changes, which are not prompted by the driver, are at least partially corrected for the lowest possible fuel consumption, such as gasoline or diesel fuel, of the drive motor of the vehicle.
Im Sinne der Erfindung wird die Gleichmäßigkeit der Fahrt als ein wichtige Faktor für eine energiesparende Fahrweise verbessert. Das bedeutet, es sollen Beschleunigungs- und auch Verzögerungsvorgange auf ein nötiges Maß verringert werde .In the sense of the invention, the uniformity of driving is improved as an important factor for an energy-saving driving style. This means that acceleration and deceleration processes should be reduced to the necessary extent.
Besonders bevorzugt wird dieses Verfahren für Fahrzeuge mit einem Benzin-Direkteinspritzer oder Dieselmotore als Antriebsmotor eingesetzt, die im Teillastbetrieb besondere Vorteile im Verbrauch aufweisen.This method is particularly preferably used for vehicles with a gasoline direct injector or diesel engines as the drive motor, which have particular advantages in terms of consumption in part-load operation.
Darüber hinaus ist es vorgesehen, dass das Fahrzeug auf Änderungen der Fahrpedalstellung wie bisher (ohne verbrauchsoptimierte Regelung nach dem Verfahren der Erfindung) reagieren soll, wenn es die Verkehrssituation erfordert und wenn es dem Fahrerwunsch entspricht.In addition, it is provided that the vehicle should react to changes in the accelerator pedal position as before (without consumption-optimized control according to the method of the invention) if the traffic situation requires it and if it corresponds to the driver's request.
Insgesamt wird dem Fahrer vorteilhaft durch diese Lösung keine generelles anderes Fahrverhalten "aufgezwungen" . Der automatische Eingriff in die Fahrzeugregelung durch das Verfahren nach der Erfindung wird nicht als eine Bevormundung für den Fahrer angesehen und kann vom Fahrer einfacher akzeptiert werden.Overall, this solution advantageously does not "force" any other general driving behavior on this solution. The automatic intervention in the vehicle control by the method according to the invention is not regarded as patronizing for the driver and can be accepted more easily by the driver.
Es zeigt sich, dass durch diese Maßnahmen nach der Erfindung der Fahrer dort unterstützt wird, wo selbst ein geübter und vorausschauender Fahrer Defizite bei seinem Verhalten im Hinblick auf optimale Energieeffizienz des Fahrzeugs aufweißt. Darüber hinaus verbessert das Verfahren nicht nur den Kraftstoffverbrauch, sondern steigert auch den Fahrkomfort durch eine gleichmäßigere FahrZeuggeschwindigkeit .It turns out that these measures according to the invention support the driver where even an experienced and forward-looking driver has deficits in his behavior with regard to optimal energy efficiency Vehicle. In addition, the process not only improves fuel consumption, but also increases driving comfort through a more uniform vehicle speed.
Erfindungsgemäß ist es vorgesehen, dass eine Änderung eines Fahrwiderstands ermittelt wird und dieAccording to the invention it is provided that a change in driving resistance is determined and the
Fahrwiderstandsänderung zumindest teilweise ausgeregelt wird.Driving resistance change is at least partially corrected.
Erfindungsgemäß ist es vorgesehen, dass bei der Ermittlung der Fahrwiderstandsänderung eine Änderung der Fahrbahnneigung in Fahrzeuglängsrichtung, wie eine Fahrbahnsteigung oder eine Fahrbahngefälle, oder eine Änderung von Witterungsbedingungen, insbesondere veränderliche Geschwindigkeiten atmosphärischen Windes, oder Fahrbedingungen, wie veränderliche Anströmwinkel des Fahrzeugs in einem Windschatten eines anderen Fahrzeugs oder Objekts, und/oder eine Kurvenfahrt mit berücksichtigt wird.According to the invention, it is provided that when determining the change in driving resistance, a change in the inclination of the road in the longitudinal direction of the vehicle, such as a road gradient or gradient, or a change in weather conditions, in particular changing speeds of atmospheric wind, or driving conditions, such as changing inflow angles of the vehicle in a slipstream of another Vehicle or object, and / or cornering is taken into account.
Erfindungsgemäß ist es vorgesehen, dass der Fahrerwunsch nach einer gleichmäßigen Fahrzeuggeschwindigkeit erkannt wird auf Grundlage der Fahrpedalbewegung (Gaspedalbewegung) .According to the invention, the driver's desire for a uniform vehicle speed is recognized on the basis of the accelerator pedal movement (accelerator pedal movement).
Damit ist es möglich, Fahrgeschwindigkeitsänderungen, die nicht durch den Fahrer initiiert werden, feinfühlig auszuregeln, ohne das der Fahrer es bemerkt. Dabei sind zusätzliche technische Bauteile im Grundsatz nicht notwendig.This makes it possible to fine-tune changes in driving speed that are not initiated by the driver without the driver noticing. In principle, additional technical components are not necessary.
Erfindungsgemäß ist es vorgesehen, dass wenn eine Stellung des Fahrpedals für einen bestimmten, vorgegebenen Zeitraum konstant vom Fahrer eingestellt bzw. gehalten wird, eine aus dieser Stellung des Fahrpedals resultierende Fahrzeuggeschwindigkeit als eine den Fahrerwunsch repräsentierende Wunschgeschwindigkeit erkannt wird.According to the invention, it is provided that when the accelerator pedal is in a position for a specific, predetermined period is constantly set or held by the driver, a vehicle speed resulting from this position of the accelerator pedal is recognized as a desired speed representing the driver's request.
Erfindungsgemäß ist es vorgesehen, dass ein Zeitraum in einem Bereich von 1 Sekunden (sec) bis 8 sec, vorzugsweise ca. 5 sec, vorgegeben wird.According to the invention, a period of time in a range from 1 seconds (sec) to 8 seconds, preferably approximately 5 seconds, is specified.
Erfindungsgemäß ist es vorgesehen, dass die den Fahrerwunsch repräsentierende Wunschgeschwindigkeit gespeichert wird.According to the invention, it is provided that the desired speed representing the driver's request is stored.
Erfindungsgemäß ist es vorgesehen, dass die aktuelle Fahrzeuggeschwindigkeit mit der den Fahrerwunsch repräsentierenden Wunschgeschwindigkeit verglichen wird und bei einer Abweichung der aktuellen Fahrzeuggeschwindigkeit von der Wunschgeschwindigkeit das Fahrzeug automatisch beschleunigt oder verzögert bzw. abgebremst wird, um die Abweichung zu verringern, im wesentlichen ähnlich einer Funktion eines Tempomaten mit Bremseingriffsmöglichkeit.According to the invention, it is provided that the current vehicle speed is compared with the desired speed representing the driver's request and, if the current vehicle speed deviates from the desired speed, the vehicle is automatically accelerated, decelerated or braked to reduce the deviation, essentially similar to a function of a vehicle Cruise control with brake intervention option.
Erfindungsgemäß ist es vorgesehen, dass die automatische Beschleunigung oder das automatische Abbremsen des Fahrzeugs so durchgeführt werden, dass ein möglichst geringer Kraftstoffverbrauch für den Antriebsmotor des Fahrzeugs, wie Benzin oder Dieselkraftstoff, benötigt wird.According to the invention, the automatic acceleration or the automatic braking of the vehicle is carried out in such a way that the lowest possible fuel consumption for the drive motor of the vehicle, such as gasoline or diesel fuel, is required.
Nach einem anderen Aspekt der Erfindung kann die automatische Beschleunigung oder das automatische Abbremsen des Fahrzeugs so durchgeführt werden, dass für den Fahrer möglichst komfortable, relativ geringe Beschleunigungsoder Abbremsvorgänge resultieren. Erfindungsgemäß ist es vorgesehen, dass das Fahrzeug automatisch beschleunigt oder abgebremst wird, wenn die Abweichung der aktuellen Fahrzeuggeschwindigkeit von der Wunschgeschwindigkeit größer ist als 0,2 km/h bis 2 km/h.According to another aspect of the invention, the automatic acceleration or the automatic braking of the vehicle can be carried out in such a way that acceleration or braking operations that are as comfortable as possible for the driver result. According to the invention, the vehicle is automatically accelerated or braked if the deviation of the current vehicle speed from the desired speed is greater than 0.2 km / h to 2 km / h.
Die Erfindung wird nun anhand eines Ausführungsbeispiels näher erläutert.The invention will now be explained in more detail using an exemplary embodiment.
Ein Fahrzeug weist eine Fahrzeugsteuerungs- und Regeleinheit auf, welche die Fahrzeugverzögerung, durch "Gas wegnehmen" und/oder "Bremsdruckaufbau", und die Fahrzeugbeschleunigung, durch "Gas geben" und/oder "Bremsdruckabbau", automatisch beeinflussen kann.A vehicle has a vehicle control and regulating unit which can automatically influence the vehicle deceleration by "accelerating" and / or "brake pressure build-up" and the vehicle acceleration by "accelerating" and / or "brake pressure reduction".
Ausgehend von der Erkenntnis, dass der überwiegende Teil der Fahrzeit (speziell im Langstreckenbetrieb) vom Fahrer mit konstanter Geschwindigkeit zurück gelegt werden möchte, wird dieser hierbei unterstützt und unnötige Beschleunigungs- und Verzögerungsvorgänge werden vermieden.Based on the knowledge that the majority of the driving time (especially in long-distance operation) would like to be covered by the driver at a constant speed, the driver is supported and unnecessary acceleration and deceleration processes are avoided.
Dem Fahrerwunsch Konstantfahrt können im Laufe der Fahrt bestimmte, häufig auch wechselnde Fahrwiderstandssituationen entgegenstehen .The driver's request for constant travel can be opposed to certain, often changing driving resistance situations during the journey.
Strebt der Fahrer eine konstante Geschwindigkeit an und ändert sich der Fahrwiderstand (durch eine Steigung oder ein Gefälle oder Wind usw.) langsam, dann bemerkt er dies erst, wenn sich eine signifikanteIf the driver is aiming for a constant speed and the driving resistance changes slowly (due to an uphill or downhill gradient or wind, etc.), he will only notice this when there is a significant one
Geschwindigkeitsabweichung {5 km/h bis 10 km/h) von seiner Wunschgeschwindigkeit eingestellt hat. Dies liegt einerseits an der Häufigkeit der Geschwindigkeitskontrolle (Blick zum Tacho) and zum anderen an der visuellen Auflösbarkeit eines analogen Tachos. Auch die Fahrgeräusche ändern sich bei den angesprochen Abweichungen nur geringfügig.Speed deviation {5 km / h to 10 km / h) from your desired speed. This is due on the one hand to the frequency of the speed control (view of the speedometer) and on the other hand to the visual resolution of an analog speedometer. The driving noises only change with the mentioned deviations slightly.
Bemerkt der Fahrer die Abweichung, versuchte er die zuvor eingestellte Wunschgeschwindigkeit wieder einzustellen, das bedeutet er beschleunigt das Fahrzeug. Da die Fahrzeuggeschwindigkeit relativ weit von der Wunschgeschwindigkeit entfernt hat, muss dann sehr viel Energie eingesetzt werden, um die Wunschgeschwindigkeit wieder einzustellen.If the driver notices the deviation, he tries to set the previously set desired speed again, which means that he accelerates the vehicle. Since the vehicle speed is relatively far from the desired speed, a lot of energy must then be used to reset the desired speed.
Steigt die Fahrzeuggeschwindigkeit, z.B. bei einer Bergabfahrt, an, wird durch eine dann ggf. eingeleitete Bremsung Energie vernichtet, die zuvor dem System zugeführt wurde .If the vehicle speed increases, e.g. when going downhill, energy is then released by braking, which may have been initiated, and was previously supplied to the system.
In beiden Situationen kann zusätzlich ein Einschwingvorgang um die Wunschgeschwindigkeit herum den Vorgang noch ineffizienter machen.In both situations, a transient process around the desired speed can make the process even more inefficient.
Somit haben die Fahrwiderstandsänderungen eine Vielzahl von Ursachen, die nur zum Teil vom Fahrer intuitiv erfasst werden können.The changes in driving resistance therefore have a variety of causes that can only be intuitively ascertained by the driver.
Die offensichtlichste Fahrwiderstandsänderung ist die Fahrt auf einer geneigten Fahrbahn. Auch hierbei wird eine geringe Fahrbahnneigung vom Fahrer meist nicht bemerkt. Diese Fahrwiderstandsänderung wird nach der Erfindung durch das erfindungsgemäße Verfahren ausgeregelt.The most obvious change in driving resistance is driving on an inclined road. Here, too, a slight inclination to the road is usually not noticed by the driver. This change in driving resistance is corrected according to the invention by the method according to the invention.
Der zweite wichtige Fahrwiderstandsänderung, die vom Fahrer nicht direkt erfasst werden kann, ist die Änderung des Luftwiderstandes, der durch Fahren im Windschatten, bzw. veränderliche Anströmwinkel und/oder veränderliche Geschwindigkeiten des atmosphärischen Windes entstehen können. Diese Fahrwiderstandsänderung wird nach der Erfindung durch das erfindungsgemäße Verfahren ausgeregelt.The second important change in driving resistance, which the driver cannot directly detect, is the change in air resistance caused by driving in the slipstream or changing inflow angles and / or changing speeds of the atmospheric wind can. This change in driving resistance is corrected according to the invention by the method according to the invention.
Auch durch eine Kurvenfahrt und dem damit verbundenen Schräglaufschlupf steigt der Fahrwiderstand an. Dieser Anstieg wird als von untergeordneter Bedeutung angesehen. Auch diese Fahrwiderstandsänderung wird nach der Erfindung durch das erfindungsgemäße Verfahren ausgeregelt .The driving resistance also increases due to cornering and the associated slip slip. This increase is considered to be of minor importance. This change in driving resistance is also corrected according to the invention by the method according to the invention.
Der Fahrerwunsch eine konstante Geschwindigkeit zu fahren, wird nach der Erfindung durch eine Überwachung der Fahrpedalstellung (Pedal Position) realisiert.According to the invention, the driver's desire to drive a constant speed is realized by monitoring the accelerator pedal position (pedal position).
Stellt der Fahrer eine Fahrpedalstellung für 1 bis 8 Sekunden (sec) konstant ein, wobei Abweichung innerhalb eines engen Bandes nicht berücksichtig werden, wird dieses der FahrpedalStellung entsprechende Moment vom Motorsteuergerät eingestellt. Es wird nun gewartet, bis sich die Fahrzeuggeschwindigkeit dem Moment '-entsprechend eingestellt hat and sich nicht mehr verändert.If the driver constantly sets an accelerator pedal position for 1 to 8 seconds (sec), whereby deviations within a narrow band are not taken into account, the torque corresponding to the accelerator pedal position is set by the engine control unit. It is now waited until the vehicle speed has adjusted to the moment and no longer changes.
Die dann festgestellte Geschwindigkeit wird gespeichert. Erfindungsgemäß wird davon ausgegangen, dass diese festgestellte Geschwindigkeit die Wunschgeschwindigkeit darstellt.The speed then determined is saved. According to the invention, it is assumed that this determined speed represents the desired speed.
Wenn dies nicht der Fall ist, fordert der Fahrer über das Fahrpedal mehr Moment an. Das Moment ist dann nicht mehr konstant .If this is not the case, the driver requests more torque via the accelerator pedal. The moment is then no longer constant.
Die aktuelle Fahrzeuggeschwindigkeit wird ständig mit der gespeicherten Geschwindigkeit (Wunschgeschwindigkeit) verglichen. Wird eine Abweichung von 0,2 km/h bis 2 km/h detektiert, dann wird das Motormoment verändert, um diese Abweichung zu minimieren, das bedeutet im Sinne der Erfindung "auszuregeln" .The current vehicle speed is constantly compared with the stored speed (desired speed). If a deviation of 0.2 km / h to 2 km / h is detected, the engine torque is changed by this Minimizing the deviation means "correcting" in the sense of the invention.
Die Überwachung lässt dabei keine Abweichungen zu, die dem Fahrer auffällig werden. Daher ist die Wahrscheinlichkeit eines ineffizienten Eingriffs durch den Fahrer deutlich reduziert.The monitoring does not allow any deviations that are noticeable to the driver. Therefore, the likelihood of inefficient intervention by the driver is significantly reduced.
Fahrpedalbewegungen, d. h. Schwingungen des Fahrpedals, die größer 1 Hz sind, das bedeutet Bewegungen öfter als 1 mal pro Sekunde, werden nicht zur Änderung der Wunschgeschwindigkeit herangezogen. Diese Fahrpedalbewegungen werden als Störung angesehen.Accelerator pedal movements, d. H. Vibrations of the accelerator pedal that are greater than 1 Hz, i.e. movements more than once per second, are not used to change the desired speed. These accelerator pedal movements are considered a disturbance.
Da das gesamte Verfahren vorteilhaft recht träge ausgelegt ist, werden die hier ggf. entstehenden relativ kurzen Übergangszeiten (Delays) vom Fahrer nicht bemerkt.Since the entire method is advantageously designed to be very slow, the relatively short transition times (delays) that may arise here are not noticed by the driver.
Langsame Fahrpedalbewegungen werden sofort umgesetzt, da dies mit sehr hoher Wahrscheinlichkeit keine Störung, sondern ein neuer Fahrerwunsch ist.Slow accelerator pedal movements are implemented immediately, since it is very likely that this is not a malfunction but a new driver request.
Ebenfalls schnelle Fahrpedalbewegungen in eine Richtung und mit einer eindeutigen Amplitude, die am Ende in einer Position verbleiben, werden auch sofort umgesetzt und nach kurzer Überwachungszeit als Fahrerwunsch angesehen.Rapid accelerator pedal movements in one direction and with a clear amplitude, which remain in one position at the end, are also implemented immediately and viewed as a driver request after a short monitoring time.
Die Momentenänderung, die durch die Einregelung der Wunschgeschwindigkeit zugelassen wird, umfasst nicht das gesamte durch den Motor zur Verfügung stehende Moment, sondern es werden nur Änderungen von + 10% bis + 40% des Anfangsmomentes (Moment welches bei der Speicherung der Wunschgeschwindigkeit anlag) zugelassen. Damit wird dem Fahrer immer die Möglichkeit gegeben, aktiv zu beschleunigen bzw. Ξchleppmoment aufzubringen.The change in torque, which is permitted by the regulation of the desired speed, does not include the entire torque available by the motor, but only changes from + 10% to + 40% of the initial torque (torque that was applied when the desired speed was saved) , This always gives the driver the opportunity to actively accelerate or apply drag torque.
Des weiteren ist erfindungsgemäß eine Begrenzung des Geschwindigkeitsbereichs vorgesehen, in dem die Funktion nach der Erfindung durchgeführt wird. Das überwiegende Sparpotential liegt bei höheren Geschwindigkeiten (größer 60 km/h bis 70 km/h) . In diesen Geschwindigkeitsbereichen liegen häufiger Konstantfahrten vor als bei Stadtfahrten. Daher kommt das Verfahren vorzugsweise zur Anwendung bei Fahrzeuggeschwindigkeiten größer ca. 60 km/h bis 70 km/h. Furthermore, a limitation of the speed range in which the function according to the invention is carried out is provided according to the invention. The predominant savings potential lies at higher speeds (greater than 60 km / h to 70 km / h). Constant speeds are more common in these speed ranges than in city trips. The method is therefore preferably used at vehicle speeds greater than approximately 60 km / h to 70 km / h.

Claims

Patentansprüche claims
1. Verfahren zur Verringerung des Kraftstoffverbrauchs eines Kraftfahrzeugs, dadurch gekennzeichnet, dass ein Fahrerwunsch nach einer gleichmäßigen FahrZeuggeschwindigkeit ermittelt wird und dass wenn der Fahrerwunsch nach einer gleichmäßigen Fahrzeuggeschwindigkeit erkannt wurde, die Fahrzeuggeschwindigkeitsänderungen, die nicht durch den Fahrer veranlasst sind, im Hinblick auf einen möglichst geringen Kraftstoffverbrauch des Antriebsmotors des Fahrzeugs zumindest teilweise ausgeregelt werden.1. A method for reducing the fuel consumption of a motor vehicle, characterized in that a driver's request for a uniform vehicle speed is determined and that if the driver's request for a uniform vehicle speed has been recognized, the vehicle speed changes that are not prompted by the driver, with a view to a possible low fuel consumption of the drive motor of the vehicle are at least partially corrected.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass eine Änderung eines Fahrwiderstands ermittelt wird und die Fahrwiderstandsänderung zumindest teilweise ausgeregelt wird.2. The method according to claim 1, characterized in that a change in driving resistance is determined and the driving resistance change is at least partially corrected.
3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass bei der Ermittlung der Fahrwiderstandsänderung eine Änderung der Fahrbahnneigung in Fahrzeuglängsrichtung, wie eine Fahrbahnsteigung oder eine Fahrbahngefälle, oder eine Änderung von Witterungsbedingungen, insbesondere veränderliche Geschwindigkeiten atmosphärischen Windes, oder Fahrbedingungen, wie veränderliche Anströmwinkel des Fahrzeugs in einem Windschatten eines anderen Fahrzeugs ode Objekts und/oder eine Kurvenfahrt mit berücksichtigt wird. 3. The method according to claim 2, characterized in that when determining the driving resistance change, a change in the road inclination in the vehicle longitudinal direction, such as a road gradient or a road gradient, or a change in weather conditions, in particular changing speeds of atmospheric wind, or driving conditions, such as changing flow angle of the vehicle in a slipstream of another vehicle or object and / or cornering is also taken into account.
4. Verfahren nach einem der Ansprüche 1 bis 3, , dadurch gekennzeichnet, dass der Fahrerwunsch nach einer gleichmäßigen Fahrzeuggeschwindigkeit erkannt wird auf Grundlage der Fahrpedalbewegung (Gaspedalbewegung) .4. The method according to any one of claims 1 to 3, characterized in that the driver's desire for a uniform vehicle speed is recognized on the basis of the accelerator pedal movement (accelerator pedal movement).
5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass wenn eine Stellung des Fahrpedals für einen bestimmten, vorgegebenen Zeitraum konstant vom Fahrer eingestellt bzw. gehalten wird, eine aus dieser Stellung des Fahrpedals resultierende Fahrzeuggeschwindigkeit als eine den Fahrerwunsch repräsentierende Wunschgeschwindigkeit erkannt wird.5. The method according to claim 4, characterized in that when a position of the accelerator pedal is set or held constant by the driver for a specific, predetermined period of time, a vehicle speed resulting from this position of the accelerator pedal is recognized as a desired speed representing the driver's request.
6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass ein Zeitraum in einem Bereich von 1 sec bis 8 sec, vorzugsweise ca. 5 sec, vorgegeben wird.6. The method according to claim 5, characterized in that a time period in a range of 1 sec to 8 sec, preferably about 5 sec, is specified.
7. Verfahren nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass die den Fahrerwunsch repräsentierende Wunschgeschwindigkeit gespeichert wird.7. The method according to claim 5 or 6, characterized in that the desired speed representing the driver's request is stored.
8. Verfahren nach einem der Ansprüche 5 bis 7, dadurch gekennzeichnet, dass die aktuelle Fahrzeuggeschwindigkeit mit der den Fahrerwunsch repräsentierenden Wunschgeschwindigkeit verglichen wird und bei einer Abweichung der aktuellen Fahrzeuggeschwindigkeit von der Wunschgeschwindigkeit das Fahrzeug automatisch beschleunigt oder verzögert bzw. abgebremst wird, um die Abweichung zu verringern . 8. The method according to any one of claims 5 to 7, characterized in that the current vehicle speed is compared with the desired speed representing the driver's request and if the current vehicle speed deviates from the desired speed, the vehicle is automatically accelerated or decelerated or braked by the deviation to reduce .
9. Verfahren nach Anspruch 8, dadurch gekennzeichnet, dass die automatische Beschleunigung oder das automatische Abbremsen des Fahrzeugs so durchgeführt werden, dass ein möglichst geringer Kraftstoffverbrauch für den Antriebsmotor des Fahrzeugs, wie Benzin oder Dieselkraftstoff, benötigt wird.9. The method according to claim 8, characterized in that the automatic acceleration or the automatic braking of the vehicle are carried out so that the lowest possible fuel consumption for the drive motor of the vehicle, such as gasoline or diesel fuel, is required.
10. Verfahren nach Anspruch 8 oder 9, dadurch gekennzeichnet, dass das Fahrzeug automatisch beschleunigt oder abgebremst wird, wenn die Abweichung der aktuellen Fahrzeuggeschwindigkeit von der Wunschgeschwindigkeit größer ist als 0,2 bis 2 km/h. 10. The method according to claim 8 or 9, characterized in that the vehicle is automatically accelerated or braked when the deviation of the current vehicle speed from the desired speed is greater than 0.2 to 2 km / h.
EP04804532A 2003-11-14 2004-11-12 Method for reducing the fuel consumption of a motor vehicle Ceased EP1687173A1 (en)

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DE102004048494A DE102004048494A1 (en) 2003-11-14 2004-10-05 Method for reducing vehicle fuel consumption comprises evaluating desired speed from position of accelerator pedal which is maintained for 5 seconds, vehicle then being accelerated or braked if speed deviates from desired value
PCT/EP2004/052939 WO2005047048A1 (en) 2003-11-14 2004-11-12 Method for reducing the fuel consumption of a motor vehicle

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