WO2004083627A1 - Method for controlling an internal combustion engine - Google Patents

Method for controlling an internal combustion engine Download PDF

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Publication number
WO2004083627A1
WO2004083627A1 PCT/DE2004/000088 DE2004000088W WO2004083627A1 WO 2004083627 A1 WO2004083627 A1 WO 2004083627A1 DE 2004000088 W DE2004000088 W DE 2004000088W WO 2004083627 A1 WO2004083627 A1 WO 2004083627A1
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WO
WIPO (PCT)
Prior art keywords
internal combustion
combustion engine
vehicle
brake
switched
Prior art date
Application number
PCT/DE2004/000088
Other languages
German (de)
French (fr)
Inventor
Klaus Ries-Mueller
Original Assignee
Robert Bosch Gmbh
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
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to EP04704173A priority Critical patent/EP1608871A1/en
Publication of WO2004083627A1 publication Critical patent/WO2004083627A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/08—Circuits or control means specially adapted for starting of engines
    • F02N11/0814—Circuits or control means specially adapted for starting of engines comprising means for controlling automatic idle-start-stop
    • F02N11/0818—Conditions for starting or stopping the engine or for deactivating the idle-start-stop mode
    • F02N11/0833—Vehicle conditions
    • 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
    • B60K28/00—Safety devices for propulsion-unit control, specially adapted for, or arranged in, vehicles, e.g. preventing fuel supply or ignition in the event of potentially dangerous conditions
    • B60K28/10—Safety devices for propulsion-unit control, specially adapted for, or arranged in, vehicles, e.g. preventing fuel supply or ignition in the event of potentially dangerous conditions responsive to conditions relating to the vehicle 
    • 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
    • B60K28/00—Safety devices for propulsion-unit control, specially adapted for, or arranged in, vehicles, e.g. preventing fuel supply or ignition in the event of potentially dangerous conditions
    • B60K28/10—Safety devices for propulsion-unit control, specially adapted for, or arranged in, vehicles, e.g. preventing fuel supply or ignition in the event of potentially dangerous conditions responsive to conditions relating to the vehicle 
    • B60K28/14—Safety devices for propulsion-unit control, specially adapted for, or arranged in, vehicles, e.g. preventing fuel supply or ignition in the event of potentially dangerous conditions responsive to conditions relating to the vehicle  responsive to accident or emergency, e.g. deceleration, tilt of vehicle
    • 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
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • 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
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
    • 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
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/18—Conjoint control of vehicle sub-units of different type or different function including control of braking systems
    • 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
    • B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units, or advanced driver assistance systems for ensuring comfort, stability and safety or drive control systems for propelling or retarding the vehicle
    • B60W30/18—Propelling the vehicle
    • B60W30/18009—Propelling the vehicle related to particular drive situations
    • B60W30/18018—Start-stop drive, e.g. in a traffic jam
    • 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
    • B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units, or advanced driver assistance systems for ensuring comfort, stability and safety or drive control systems for propelling or retarding the vehicle
    • B60W30/18—Propelling the vehicle
    • B60W30/18009—Propelling the vehicle related to particular drive situations
    • B60W30/18054—Propelling the vehicle related to particular drive situations at stand still, e.g. engine in idling state
    • 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
    • B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units, or advanced driver assistance systems for ensuring comfort, stability and safety or drive control systems for propelling or retarding the vehicle
    • B60W30/18—Propelling the vehicle
    • B60W30/1819—Propulsion control with control means using analogue circuits, relays or mechanical links
    • 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
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/18—Braking system
    • B60W2510/186—Status of parking brakes
    • 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
    • B60W2540/12—Brake pedal position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N2200/00—Parameters used for control of starting apparatus
    • F02N2200/08—Parameters used for control of starting apparatus said parameters being related to the vehicle or its components
    • F02N2200/0803—Parking brake state
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N2200/00—Parameters used for control of starting apparatus
    • F02N2200/08—Parameters used for control of starting apparatus said parameters being related to the vehicle or its components
    • F02N2200/0805—Detection of vehicle emergency state, e.g. from ABS, ESP, external sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N2200/00—Parameters used for control of starting apparatus
    • F02N2200/12—Parameters used for control of starting apparatus said parameters being related to the vehicle exterior
    • F02N2200/124—Information about road conditions, e.g. road inclination or surface
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N99/00—Subject matter not provided for in other groups of this subclass
    • F02N99/002—Starting combustion engines by ignition means
    • F02N99/006—Providing a combustible mixture inside the cylinder
    • 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 is based on a method for controlling an internal combustion engine of a vehicle, in which the internal combustion engine is switched off or started automatically in certain operating states of the vehicle.
  • a method for starting an internal combustion engine of a motor vehicle is known for example from DE 197 43 492 AI.
  • shift operation the engine is automatically switched off by a control device in the presence of certain operating conditions, such as driving speed, the driver's desired torque and the like, and is automatically restarted.
  • the starting process takes place in such a way that fuel is injected directly in a first injection into the combustion chamber whose associated piston is in the working phase.
  • Such a method makes it possible to carry out a start-stop operation of the internal combustion engine without using electrical starting means or other mechanical or electrical energy stores.
  • the internal combustion engine is restarted solely by igniting a mixture in one of the cylinders.
  • operating parameters such as driving speed, driver's desired torque in the form of an accelerator pedal position, neutral position of the transmission, actuated service brake and the like are used in order to recognize a situation in which the internal combustion engine is to be switched off.
  • the present invention has for its object to prevent the engine from turning off in situations where turning off the engine is undesirable or even dangerous.
  • the aforementioned problem is solved by a method for controlling an internal combustion engine of a vehicle, in which the internal combustion engine is automatically switched off or started in certain operating states of the vehicle, characterized in that information from the braking system is included in the determination of the operating states.
  • the internal combustion engine is not switched off during emergency braking even after the vehicle has come to a standstill. In a dangerous situation it can be important that the vehicle can be accelerated again quickly afterwards. A necessary engine start would lead to an undesired deceleration.
  • the information from the brake system can preferably be taken from a so-called brake assistant.
  • the vehicle parking brake or handbrake can be actuated automatically, for example by the ABS control unit, for example when the driver switches off the vehicle.
  • this method comprises steps that can recognize a stop on a mountain. It is advantageous if the internal combustion engine is not switched off during the stop. This mountain situation can be determined, for example, by an independent position sensor of the vehicle or, for example, by determining the braking holding torque or the like.
  • the internal combustion engine is switched off when a parking brake of the vehicle is actuated. The parking brake is usually only applied when the vehicle is to be stopped for a longer period of time.
  • the information from the brake system contains the requested brake pressure.
  • the information from the brake system can include the time gradient of the requested brake pressure.
  • Emergency braking can be derived from the brake pressure and its gradient. In the event of emergency braking, the internal combustion engine is advantageously not switched off even after the vehicle has come to a standstill, in order to enable the driver to react immediately to the changing situation.
  • the system mentioned at the outset is also implemented by a motor vehicle with an internal combustion engine, a service brake and a control device for controlling the internal combustion engine, the control device being designed in such a way that it can carry out a method according to one of the preceding claims and by a storage medium on which a computer program is stored, which is executable on a control device, in particular for an internal combustion engine, wherein the computer program can control one of the aforementioned methods when it is executed.
  • a method for starting the internal combustion engine is Engine stored in a control unit of the internal combustion engine. This method permits a start-stop operation of the t internal combustion engine, in which a restarting of the internal combustion engine of an ignitable mixture in a cylinder of the internal combustion engine, which is currently in the power stroke takes place solely by injection and ignition 5.
  • the control unit is additionally connected to a control unit for the service brake, for example via a vehicle bus or its own wiring or the like.
  • control unit of the internal combustion engine is connected to further sensors, for example to a sensor on the parking brake.
  • the control unit of the internal combustion engine can now recognize the requirements for "engine off” from various parameters, e.g.ffygeschwindig-
  • the brake assistant is a procedure for the detection of an emergency braking, which consists of different parameters
  • a further procedural step can be provided in which the situation when starting off on a mountain can be recognized.
  • the activation of a parking brake can be used as a signal for switching off the engine. As soon as the parking brake is applied, the engine is switched off.

Abstract

The invention relates to a method for controlling an internal combustion engine of a vehicle, according to which said engine is switched off or started in an automated manner in certain operating conditions. To prevent the motor from being switched off when the latter condition is not required or is dangerous, information from the braking system is included in the determination of the operating conditions.

Description

Verfahren zur Steuerung einer BrennkraftmaschineMethod for controlling an internal combustion engine
Stand der TechnikState of the art
Die Erfindung geht aus von einem Verfahren zur Steuerung einer Brennkraftmaschine eines Fahrzeuges, bei dem die Brennkraftmaschine automatisiert in bestimmten Betriebszu- ständen des Fahrzeuges abgestellt oder angelassen wird.The invention is based on a method for controlling an internal combustion engine of a vehicle, in which the internal combustion engine is switched off or started automatically in certain operating states of the vehicle.
Ein Verfahren zum Starten einer Brennkraftmaschine eines Kraftfahrzeuges ist beispielsweise aus der DE 197 43 492 AI bekannt. In einem als Schichtbetrieb bezeichneten Betriebs- zustand des Fahrzeuges wird dabei der Motor durch ein Steuergerät bei Vorliegen bestimmter Betriebsbedingungen wie Fahrgeschwindigkeit, Wunschmoment des Fahrers und dergleichen automatisiert abgestellt und automatisiert wieder angelassen. Der Anlassvorgang erfolgt dabei dergestalt, dass Kraftstoff in einer ersten Einspritzung in denjenigen Brennraum direkt eingespritzt wird, dessen zugehöriger Kolben sich in der Arbeitsphase befindet. Durch ein derartiges Verfahren ist es möglich, einen Start-Stopp-Betrieb der Brennkraftmaschine ohne Rückgriff auf elektrische Startmittel o- der sonstige mechanische bzw. elektrische Energiespeicher durchzuführen. Der Wiederstart der Brennkraftmaschine erfolgt allein durch Zündung eines Gemisches in einem der Zylinder. Nach Stand der Technik werden Betriebsparameter wie z.B. Fahrgeschwindigkeit, Wunschmoment des Fahrers in Form einer Gaspedalstellung, neutrale Stellung des Getriebes, betätigte Betriebsbremse und dergleichen herangezogen, um eine Situation zu erkennen, in der ein Abstellen der Brennkraftmaschine erfolgen soll .A method for starting an internal combustion engine of a motor vehicle is known for example from DE 197 43 492 AI. In an operating state of the vehicle referred to as shift operation, the engine is automatically switched off by a control device in the presence of certain operating conditions, such as driving speed, the driver's desired torque and the like, and is automatically restarted. The starting process takes place in such a way that fuel is injected directly in a first injection into the combustion chamber whose associated piston is in the working phase. Such a method makes it possible to carry out a start-stop operation of the internal combustion engine without using electrical starting means or other mechanical or electrical energy stores. The internal combustion engine is restarted solely by igniting a mixture in one of the cylinders. According to the prior art, operating parameters such as driving speed, driver's desired torque in the form of an accelerator pedal position, neutral position of the transmission, actuated service brake and the like are used in order to recognize a situation in which the internal combustion engine is to be switched off.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Abstellen des Motors in Situationen, in denen das Abstellen des Motors unerwünscht oder gar gefährlich ist, zu verhindern.The present invention has for its object to prevent the engine from turning off in situations where turning off the engine is undesirable or even dangerous.
Vorteile der ErfindungAdvantages of the invention
Das zuvor genannte Problem wird durch ein Verfahren zur Steuerung einer Brennkraftmaschine eines Fahrzeuges, bei dem die Brennkraftmaschine automatisiert in bestimmten Betriebszuständen des Fahrzeuges abgestellt oder angelassen wird, dadurch gekennzeichnet, dass in die Bestimmung der Betriebszustände Informationen des Bremssystems eingehen, gelöst. In einer Ausgestaltung des erfindungsgemäßen Verfahrens ist vorgesehen, dass dieses Schritte u fasst, die eine Notbremsung erkennen können. Dabei ist es vorteilhaft, wenn die Brennkraftmaschine bei der Notbremsung auch nach Stillstand des Fahrzeuges nicht abgestellt wird. In einer Gefahrensituation kann es nämlich wichtig sein, dass das Fahrzeug danach wieder schnell beschleunigt werden kann. Ein notwendiger Motorstart würde dabei zu einer nicht gewünschten Verzögerung führen. Die Informationen des Bremssystems können bevorzugt aus einem sogenannten Bremsassistenten übernommen werden. Bei modernen Bremssystemen (ABS, ESP, EHB, Bremsassistent) gibt es keine direkte mechanische Kopplung zwischen der Fahrerreaktion und der Reaktion des Bremssystems. Bei- spiele dafür sind eine Notbremsung bzw. eine Bremsung in Gefahrensituation mittels Bremsassistenten. Eine solche Situation wird aus der Fußbewegung erkannt, somit also aus dem negativen Gradienten des Gaspedals und dem Gradienten des 5 Bremsdruckes jeweils über die Zeit gemessen. Es wird also die abwechselnde Betätigung von Gaspedal und Bremspedal in zügiger Abfolge mit entsprechend starkem Druck auf das Bremspedal als Parameter, aus dem eine Notbremsung erkannt werden kann, genutzt. Es kann dabei beispielsweise vorko - L0 men, dass der Fahrer nur 50% der möglichen Bremsverzögerung anfordert, das System aber 100% verzögert.The aforementioned problem is solved by a method for controlling an internal combustion engine of a vehicle, in which the internal combustion engine is automatically switched off or started in certain operating states of the vehicle, characterized in that information from the braking system is included in the determination of the operating states. In one embodiment of the method according to the invention, it is provided that it takes steps u that can recognize emergency braking. It is advantageous if the internal combustion engine is not switched off during emergency braking even after the vehicle has come to a standstill. In a dangerous situation it can be important that the vehicle can be accelerated again quickly afterwards. A necessary engine start would lead to an undesired deceleration. The information from the brake system can preferably be taken from a so-called brake assistant. With modern brake systems (ABS, ESP, EHB, brake assistant) there is no direct mechanical coupling between the driver's reaction and the reaction of the brake system. examples Games for this are emergency braking or braking in dangerous situations using brake assistants. Such a situation is recognized from the movement of the foot, thus measured from the negative gradient of the accelerator pedal and the gradient of the brake pressure in each case over time. The alternating actuation of accelerator pedal and brake pedal in rapid succession with correspondingly strong pressure on the brake pedal is used as a parameter from which emergency braking can be recognized. It can happen, for example, that the driver requests only 50% of the possible braking deceleration, but the system decelerates 100%.
Ebenso kann es sinnvoll sein, beim Erkennen einer Gefahrensituation, beispielsweise aus dem Gradienten des Gaspedals,It can also make sense to recognize a dangerous situation, for example from the gradient of the accelerator pedal,
.5 frühzeitig das Bremssystem zu aktivieren, zum Beispiel durch einen entsprechenden Druckaufbau. Der Druckaufbau führt dann bei einem nachfolgenden Bremseingriff zu einer schnelleren Reaktion. Beim Anhalten am Berg kann es beispielsweise zu einem ungewollten Rückrollen des Fahrzeuges kommen. Dieses.5 to activate the brake system early, for example by building up pressure accordingly. The pressure build-up then leads to a faster response in the event of a subsequent brake intervention. When stopping on the mountain, for example, the vehicle may roll back unintentionally. This
0 Rückrollen wird durch einen automatisierten Bremseingri f (sogenannte hill holder Funktion) verhindert. Zusätzlich kann die Fahrzeugfeststellbremse bzw. Handbremse automatisch, beispielsweise durch das ABS-Steuergerät , betätigt werden, beispielsweise wenn der Fahrer das Fahrzeug ab-0 Rolling back is prevented by an automated brake intervention (so-called hill holder function). In addition, the vehicle parking brake or handbrake can be actuated automatically, for example by the ABS control unit, for example when the driver switches off the vehicle.
5 stellt.5 places.
In einer weiteren Ausgestaltung des Verfahrens ist vorgesehen, dass dieses Verfahren Schritte umfasst, die einen Halt an einem Berg erkennen können. Dabei ist es vorteilhaft, 0 wenn die Brennkraftmaschine bei dem Halt nicht abgestellt wird. Diese Bergsituation kann beispielsweise durch einen eigenständigen Lagesensor des Fahrzeuges oder beispielsweise durch Bestimmung des Bremshaltemomentes oder dergleichen ermittelt werden. In einer weiteren Ausgestaltung des Verfahrens ist vorgesehen, dass die Brennkraftmaschine bei Betätigung einer Feststellbremse des Fahrzeuges abgestellt wird. Die Betätigung der Feststellbremse geschieht üblicherweise nur, wenn das Fahrzeug für einen längeren Zeitraum zum Stillstand gebracht werden soll .In a further embodiment of the method, it is provided that this method comprises steps that can recognize a stop on a mountain. It is advantageous if the internal combustion engine is not switched off during the stop. This mountain situation can be determined, for example, by an independent position sensor of the vehicle or, for example, by determining the braking holding torque or the like. In a further embodiment of the method it is provided that the internal combustion engine is switched off when a parking brake of the vehicle is actuated. The parking brake is usually only applied when the vehicle is to be stopped for a longer period of time.
In einer weiteren Ausgestaltung des Verfahrens ist vorgesehen, dass die Informationen des Bremssystems den angeforderten Bremsdruck beinhalten. Zusätzlich können die Informationen des Bremssystems den zeitlichen Gradienten des angeforderten Bremsdruckes beinhalten. Aus dem Bremsdruck und dessen Gradienten lässt sich eine Notbremsung ableiten. Bei einer Notbremsung wird die Brennkraftmasc ine vorteilhaft auch nach Erreichen des Fahrzeugstillstandes nicht abgestellt, um eine unverzügliche Reaktion des Fahrers auf die sich ändernde Situation zu ermöglichen.In a further embodiment of the method it is provided that the information from the brake system contains the requested brake pressure. In addition, the information from the brake system can include the time gradient of the requested brake pressure. Emergency braking can be derived from the brake pressure and its gradient. In the event of emergency braking, the internal combustion engine is advantageously not switched off even after the vehicle has come to a standstill, in order to enable the driver to react immediately to the changing situation.
Das eingangs genannte System wird auch durch ein Kraftfahrzeug mit einer Brennkraftmaschine, einer Betriebsbremse und einem Steuergerät zur Steuerung der Brennkraftmaschine, wobei das Steuergerät derart ausgebildet ist, dass es ein Verfahren nach einem der vorhergehenden Ansprüche ausführen kann sowie durch ein Speichermedium, auf dem ein Computerprogramm abgespeichert ist, das auf einem Steuergerät insbesondere für eine Brennkraftmaschine ablauffähig ist, wobei das Computerprogramm bei seiner Ausführung eines der zuvor genannten Verfahren steuern kann, gelöst.The system mentioned at the outset is also implemented by a motor vehicle with an internal combustion engine, a service brake and a control device for controlling the internal combustion engine, the control device being designed in such a way that it can carry out a method according to one of the preceding claims and by a storage medium on which a computer program is stored, which is executable on a control device, in particular for an internal combustion engine, wherein the computer program can control one of the aforementioned methods when it is executed.
Nachfolgend wird ein Ausführungsbeispiel der vorliegenden Erfindung beschrieben. Bei einem Kraftfahrzeug mit einer Brennkraftmaschine ist ein Verfahren zum Starten der Brenn- kraftmaschine in einem Steuergerät der Brennkraftmaschine abgelegt. Dieses Verfahren ermöglicht einen Start-Stopp- Betrieb der t Brennkraftmaschine, bei der ein Wiederstarten der Brennkraftmaschine allein durch Einspritzung und Zündung 5 eines zündfähigen Gemisches in einem Zylinder der Brennkraftmaschine, der sich gerade im Arbeitstakt befindet, erfolgt. Das Steuergerät ist zusätzlich, beispielsweise über einen Fahrzeugbus oder eine eigene Verkabelung oder dergleichen, mit einem Steuergerät für die Betriebsbremse verbun-An exemplary embodiment of the present invention is described below. In a motor vehicle with an internal combustion engine, a method for starting the internal combustion engine is Engine stored in a control unit of the internal combustion engine. This method permits a start-stop operation of the t internal combustion engine, in which a restarting of the internal combustion engine of an ignitable mixture in a cylinder of the internal combustion engine, which is currently in the power stroke takes place solely by injection and ignition 5. The control unit is additionally connected to a control unit for the service brake, for example via a vehicle bus or its own wiring or the like.
L0 den. Zusätzlich ist das Steuergerät der Brennkraftmaschine mit weiteren Sensoren verbunden, beispielsweise mit einem Sensor an der Feststellbremse. Das Steuergerät der Brennkraftmaschine kann nun an diversen Parametern die Anforderungen für "Motor aus" erkennen, z.B. Fahrzeuggeschwindig-L0 den. In addition, the control unit of the internal combustion engine is connected to further sensors, for example to a sensor on the parking brake. The control unit of the internal combustion engine can now recognize the requirements for "engine off" from various parameters, e.g. Fahrzeuggeschwindig-
.5 keit = 0km/h, Fahrzeug ist im Leerlauf oder dergleichen. Ist dies der Fall, so wird in einem weiteren Schritt überprüft, ob durch einen Bremsassistenten eine Notbremsung erkannt worden ist. Der Bremsassistent ist ein Verfahren zur Erkennung einer Notbremsung, bei der aus verschiedenen Parametern.5 speed = 0km / h, vehicle is idling or the like. If this is the case, it is checked in a further step whether an emergency braking operation has been recognized by a brake assistant. The brake assistant is a procedure for the detection of an emergency braking, which consists of different parameters
10 der Bremsbetätigung und der Gaspedalbetätigung auf das Vorliegen einer Notbremssituation geschlossen wird. Übliche dazu verwendete Parameter sind der Gradient der Gaspedalbetätigung sowie der Gradient der Bremspedalbetätigung. Erkennt der Bremsassistent keine Notbremsung, so wird der Motor ab-10 of the brake actuation and the accelerator pedal actuation is concluded that there is an emergency braking situation. Common parameters used for this are the gradient of the accelerator pedal actuation and the gradient of the brake pedal actuation. If the brake assistant does not detect emergency braking, the engine is switched off.
5 gestellt. Wird eine Notbremsung erkannt, so wird der Motor nicht abgestellt.5 posed. If emergency braking is detected, the engine is not switched off.
Neben einem Verf hrensschritt, bei dem ein Bremsassistent eine Notbremsung erkennen kann, kann ein weiterer Verfahrensschritt vorgesehen sein, bei dem die Situation eines An- 0 fahrens am Berg erkannt werden kann. Die Betätigung einer Feststellbremse kann dagegen als Signal für das Ausschalten des Motor benutzt werden. Sobald die Feststellbremse betätigt wird, wird der Motor abgestellt. In addition to a procedural step in which a brake assistant can recognize emergency braking, a further procedural step can be provided in which the situation when starting off on a mountain can be recognized. The activation of a parking brake, on the other hand, can be used as a signal for switching off the engine. As soon as the parking brake is applied, the engine is switched off.

Claims

AnsprücheExpectations
I.Verfahren zur Steuerung einer Brennkraftmaschine eines Fahrzeuges, bei dem die Brennkraftmaschine automatisiert in bestimmten Betriebszuständen des Fahrzeuges abgestellt oder angelassen wird, dadurch gekennzeichnet, dass in die Bestimmung der Betriebszustände Informationen des Bremssystems eingehen.I. Method for controlling an internal combustion engine of a vehicle, in which the internal combustion engine is automatically switched off or started in certain operating states of the vehicle, characterized in that information from the braking system is included in the determination of the operating states.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass dieses Verfahrensschritte umfasst, die eine Notbremsung erkennen können.2. The method according to claim 1, characterized in that it comprises method steps that can detect emergency braking.
3. Verfahren einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Brennkraftmaschine bei der Notbremsung auch nach Stillstand des Fahrzeuges nicht abgestellt wird.3. The method according to any one of the preceding claims, characterized in that the internal combustion engine is not switched off during emergency braking even after the vehicle has come to a standstill.
4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass dieses Verfahrensschritte umfasst, die einen Halt an einem Berg erkennen können.4. The method according to claim 1, characterized in that it comprises method steps that can recognize a stop on a mountain.
5. Verfahren dem vorstehenden Anspruch, dadurch gekennzeichnet, dass die Brennkraftmaschine bei dem Halt nicht abgestellt wird.5. The method of the preceding claim, characterized in that the internal combustion engine is not turned off during the stop.
6. Verfahren einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Brennkraftmaschine bei Betätigung einer Feststellbremse des Fahrzeuges abgestellt wird. 6. The method according to any one of the preceding claims, characterized in that the internal combustion engine is switched off when a parking brake of the vehicle is actuated.
7. Verfahren einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Informationen des Bremssystem den angeforderten Bremsdruck beinhalten.7. The method according to any one of the preceding claims, characterized in that the information from the brake system includes the requested brake pressure.
8. Verfahren einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Informationen des Bremssystem den zeitlichen Gradienten des angeforderten Bremsdruckes beinhalten.8. The method as claimed in one of the preceding claims, characterized in that the information from the brake system includes the time gradient of the requested brake pressure.
9. Kraftfahrzeug mit einer Brennkraftmaschine, einer Betriebsbremse und einem Steuergerät zur Steuerung der Brennkraftmaschine, dadurch gekennzeichnet, dass das Steuergerät derart ausgebildet ist, dass es ein Verfahren nach einem der vorhergehenden Ansprüche ausführen kann.9. Motor vehicle with an internal combustion engine, a service brake and a control device for controlling the internal combustion engine, characterized in that the control device is designed such that it can carry out a method according to one of the preceding claims.
10. Speichermedium, auf dem ein Computerprogramm abgespeichert ist, das auf einem Steuergerät insbesondere für eine Brennkraftmaschine ablauffähig ist, wobei das Computerprogramm bei seiner Ausführung ein Verfahren nach einem der Ansprüche 1 bis 8 steuern kann. 10. Storage medium on which a computer program is stored, which is executable on a control device, in particular for an internal combustion engine, the computer program being able to control a method according to one of claims 1 to 8 when it is executed.
PCT/DE2004/000088 2003-03-20 2004-01-22 Method for controlling an internal combustion engine WO2004083627A1 (en)

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