DE10211461C1 - Automatic stop-start method for automobile IC engine blocks stopping of engine when air-conditioning is required - Google Patents

Abstract

The stop-start method employs a stop-start device (16) with respective AND functions used for stopping the engine (2) when the vehicle is brought to a standstill simultaneous with engine stopping conditions being met and for re-starting the engine when re-starting conditions are met. An engine stop permit state is provided by the automobile air-conditioning unit dependent on the detected air humidity and/or temperature in the passenger compartment.

Description

The invention relates to a method for automatic Abschal th and starting an internal combustion engine according to the preamble of claim 1.

A method of this kind and a corresponding motor drive stuff are known from DE 44 12 438 C1. In a first Process step is the running internal combustion engine via a electronic control device by interrupting the Brenn Material supply automatically turned off when over the duration of a given dwell certain engine stop conditions he are filled. In a second process step, the before parked combustion engine by means of the control device automatically restarted when certain engine start Conditions are met. Belongs to the engine stop conditions that the driving speed of the motor vehicle below a predetermined value, preferably 0 or at least small ner than a predetermined limit speed of z. B. 0.5 km / h is, and the engine speed with the traction drive skid closed below a predetermined value. To the Engine start conditions include at least that no gearbox gear engaged and that the clutch pedal is tapped, or that according to another embodiment, no transmission gear is set and the engine temperature above a predetermined value has risen.

A method of this kind and a corresponding start-stop Automatic device are also known from DE 44 21 512 C1. Depending on the operation of an accelerator pedal and a Clutch pedals become a fuel pump and a starter an internal combustion engine is activated or stopped. At, not  deflected accelerator pedal and not pedaled clutch pedal is the fuel pump preferably after a lapse of time switched off for three to five seconds. To further shutdown Conditions may include that the temperature of the Internal combustion engine greater than a predetermined operation temperature of preferably 40 degrees Celsius. A switched off fuel pump is then turned on again, when the accelerator pedal or the clutch pedal is deflected and the Crankshaft speed greater than zero and less than one step re speed is or if a given negative gradient the crankshaft speed is not exceeded, and the instantaneous crankshaft speed less than one before fixed speed, preferably less than 100 revolutions per minute. The starter is turned on and the Internal combustion engine started when the crankshaft speed equal to zero, the accelerator pedal deflected and the clutch pedal completely kicked.

A method of this kind and a corresponding motor vehicle are also known from DE 195 32 135 A1. It contains one Stop-start automatic to switch off and start the burn motor of a motor vehicle in dependence on Stop conditions or starting conditions. As stop conditions are mentioned zero load, shift operation, idle the drive day gregats (ie speed below a certain low Value), standstill of the motor vehicle (ie, driving speed below a certain small value of z. 4 km / h), Drive unit disengaged, no gear engaged, the Motor vehicle brake is actuated, operation of a stop scarf ters, operating temperature of the drive unit reached and / or the state of charge of a battery for another start condition sufficiently charged. Stopping the drive unit or the internal combustion engine can either immediately upon entry the stop condition (i.e., with very short reaction time) or delayed (eg with a reaction time of a few seconds) respectively. In the stop conditions can also enter into sizes,  which concern the driving history, z. B. it can neces be derlich that the vehicle since the last stop of the Internal combustion engine is driven at least once. It is too possible to detect from the previous driving characteristics whether the vehicle is in city traffic, in a stop-and- go traffic of congestion or overland traffic det. The reaction time can be adaptively variable in Dependence on individual or operating conditions or the Driving history. For example, in the case that in the near Past the motor vehicle has to stop at many traffic lights te, the reaction time can be shortened automatically or in the contrary case be extended. The stop conditions k alone or in subcombination and also in Total combination (AND function) are present. As a starting condition gene alone or in subcombination or total combination (AND function) are mentioned: actuation of the Accelerator, release the vehicle brake, actuation of the Kupp handling, touching or moving a gearshift lever, insert a corridor, pressing a start switch. Furthermore, can additional starting conditions are required, for. B. that the engine is stationary and / or previously switched off by automatic stop has been. An "emergency start" can be triggered if z. B. the temperature of the internal combustion engine below the operating temperature decreases or the state of charge of the battery under a Limit decreases, but z. B. to power the climate systems, servo drives, pumps or other auxiliary machinery is needed.

DE 101 23 037 A1 discloses a method and a device tion for controlled shutdown of an internal combustion engine by means of a torque output of an electrical machine, In particular, a starter / generator with the crankshaft the internal combustion engine cooperates, known. This will causes a quiet leakage of the internal combustion engine. The Internal combustion engine can after parking in a preferred position come to a standstill, which is a light on a restart  run the internal combustion engine guaranteed. Device and Procedures are also intended for start / stop operation.

From the generic DE 32 26 331 C3 is also a Ver drive known in the operating states of various Specified motor vehicle units to assess compliance ner conditions and an internal combustion engine automatically is switched off or restarted. The internal combustion engine will be turned off when the automatic start / stop function is activated, the engine speed is equal to or less than 850 Turns per minute, the clutch pedal is not up to a stepped position or more, none Left or right turn signal is emitted, headlight fer, wipers and fog lights are inactive, the Engine cooling water temperature in a certain temperature range from, for example, 75 degrees Celsius to 105 degrees Celsius, after the last start by the start / stop function one predetermined period of z. B. four seconds has elapsed, the vehicle is at a standstill, the burn motor is not operated at idle, the slope or the gradient a predetermined value of z. B. 2 degrees not over steps and turns off the magnetic switch of an air conditioner or is open. The internal combustion engine will automatically like the tempered when the automatic start / stop function is activated, the engine speed is below a target speed of z. B. 50 revolutions per minute or less, the genera Tor generates no electricity and the clutch pedal is full has passed through.

By the invention, the problem to be solved, burn motor drive systems and the Increase operational safety and ride comfort.

This object will be characterized according to the invention by the the features of claim 1 solved.  

Further features of the invention are ent in the dependent claims hold.

Accordingly, the invention relates to a method for automatic Shutting down and starting an internal combustion engine Motor vehicle by means of a stop-start device, by which the internal combustion engine, after the start of the Internal combustion engine by a person and driving the Motor vehicle with tempered combustion engine, the Stop the motor vehicle and the same as the AND function early presence of certain stop conditions, to which at least the actuation of a motor vehicle brake and a Vehicle standstill or a vehicle standstill approximated low vehicle speed belong automatically is switched on, and then at the same time as the AND function Presence of certain starting conditions automatically again is started, with the automatic shutdown of burning motor by a stop function and afterwards automatic start of the internal combustion engine taking place by a start function of the stop-start device, the automatic shutdown of the internal combustion engine too in addition depending on the further stop condition it is done that a stop release state of an air conditioning is present, which is used for air conditioning of the motor vehicle Personenraumes a ver with the internal combustion engine ver bound or connectable aggregate in the form of a refrigerant Compressor and / or a fan, characterized gekenn records that the presence of the stop release state of Air conditioning from a detected in the passenger compartment Humidity and / or temperature depends.

Air conditioning for the air conditioning of a force vehicle-person space, which one of a Internal combustion engine driven compressor and / or a blower are from the technical literature ("Automotive  Paperback ", 19th Edition, Robert Bosch, VDI Verlag, 1984, p. 594 ff.).

Another feature of the invention is characterized that the humidity in the passenger compartment by at least one Sensor is detected and depending on the detected Value of the stop release state of the climate control device then is satisfied when the detected value under a vorbestimm maximum value. This is the stop-start facility preferably with at least one sensor for detecting the Provided humidity in the passenger compartment of the vehicle.

Another feature of the invention is characterized that the temperature in the passenger compartment of the motor vehicle by at least one sensor is detected and depending on then the detected value of the stop release state is met is when the detected value within a predetermined Tolerance range is. This is the stop-start facility preferably with at least one temperature sensor for detek tion of the temperature in the passenger compartment of the motor vehicle fitted.

Another feature of the invention is characterized that the humidity and the temperature in the person room of the Motor vehicle detected by sensors and in dep from the detected values of the stop release state then met if the detected value for the air humidity is below a predetermined maximum value and the detected value for the temperature within a vorbestimm range of tolerance.

Another feature of the invention is characterized that one of the stop conditions, the same as AND function must be fulfilled, is that the Climate control device, which between automatic mode and Individual operation of a person is switchable on automa  tikbetrieb is set, and that when set to Indivi dual mode the stop condition is canceled, that the stop Release state must be present for the automatic shutdown of the internal combustion engine.

Another feature of the invention is characterized that the air conditioning of a person in the passenger compartment is switchable while the internal combustion engine is in automatic shut off state, and then at least during the total automatic switch-off of the internal combustion engine remains switched on. For this purpose contains the air conditioning preferably a priority control circuit, by which the Air conditioning from a person in the passenger compartment is switchable while the internal combustion engine is in automatic switched off state, then at least during the total automatic shutdown of the engine Air conditioning device remains switched on.

Another feature of the invention is characterized that the function of the automatic shutdown and / or the automatic starting of the internal combustion engine depending on from the respective operating state of a hood takes place.

Another feature of the invention is characterized that at least the driver's door, or several or all motor driving Doors are monitored by the stop-start facility whether they are closed or open, and that the automatic Ab switching and / or the automatic start of the Internal combustion engine depending on whether the relevant motor vehicle door or motor vehicle door concerned are closed or at least a motor vehicle door is open.

Another feature of the invention is characterized that the automatic shutdown of the engine by the stop function of the stop-start device in dependence  from the operating state of an oil system of a traction drive as an additional stop condition that takes place as an AND function be met simultaneously with all other stop conditions must, with the automatic shutdown of the engine is omitted, although all other stop conditions, however not this additional stop condition is met, and the Oil system at least one oil pump and / or sufficient contains dimensioned pressure accumulator.

The invention will be described below with reference to the drawings based on preferred embodiments as examples be wrote. In the drawings show

Fig. 1 Details of a motor vehicle according to the invention,

Fig. 2 is a side view of a motor vehicle after the dung OF INVENTION,

Fig. 3 is a diagram of a method according to the invention,

Fig. 4 is a diagram of another method according to the dung OF INVENTION,

Fig. 5 is a diagram of another method according to the invention.

Fig. 1 shows an internal combustion engine 2 via a clutch 4 and a switchable manually or automatically shiftable or automatic traction drive transmission 6 and a differential gear 8 vehicle wheels 10 and 12 drives. An electronic control device 14 for the internal combustion engine 2 is connected to it, and preferably also to the transmission 6, depending on the control, in particular if it is a shiftable transmission 6 or an automatic transmission. Furthermore, it is preferably also connected to the switchable clutch 4 in terms of control. The electronic controller 14 also includes a stop-start device 16 of the type described herein for automatically shutting down and starting the engine 2 in response to the stop conditions and start conditions described herein.

FIG. 1 also shows an electric machine 18 , which can be activated by the electronic control device 14 in order to start the combustion engine 2 as an electric motor. Preferably, the electric machine 18 is also operable as a generator for generating power for an on-board battery 20 and electrical consumers in the vehicle. This is used to supply power to the electric machine 18 at the start of the engine 2 and to power auxiliary equipment such as an air conditioner 22 for the vehicle interior and at least one pump 24 for generating hydraulic pressures for actuating the traction drive clutch 4 and / or for the operation of clutches in the transmission. 6 and / or for the circulation of cooling fluid or lubricating fluid of the transmission 6 .

According to a further feature of the invention, the automatic shutdown and / or the automatic starting of the internal combustion engine 2 takes place as a function of the respective operating state of an engine hood 26 . Among the starting conditions for an automatic start of the internal combustion engine 2 is that at the same time the hood must be in the closed position as an AND function, or, according to another embodiment, must be in a locking position.

According to a particular embodiment, the bonnet 26 may have two locking steps 28 and 30 , of which the first locking step 28 locks the bonnet 26 in its fully closed closed position and is operable from the passenger compartment 32 , and the second locking step 30 opens the bonnet 26 in a slightly open one , the fully closed closed position locked as close to partially open position that the hand of an adult person can not get through the opening gap in the engine compartment. Among the starting conditions for automatic starting of the internal combustion engine 2 , which must be present as an AND function simultaneously, heard that the hood 26 is in the full closed position or at least in the partial open position and simultaneously locked by at least one of the two locking stages 28 , 30 is.

Furthermore, the invention shows an accelerator pedal 34 for the internal combustion engine 2 and a brake pedal 36 for the vehicle brake 38 .

According to a further embodiment of the invention, all motor vehicle doors 40 , in particular the driver's door, are monitored by the stop-start device 16 , whether they are closed or open. The automatic shutdown and / or the automatic starting of the internal combustion engine 2 takes place in dependence on whether all motor vehicle doors are closed or at least one motor vehicle door is open. The starting conditions, which must be met simultaneously as an AND function, preferably includes that all motor vehicle doors 40 are closed, so that an automatic starting of the internal combustion engine is omitted if at least one motor vehicle door is open.

A trunk door or decklid 42 is preferably equally included in the stop conditions and / or launch conditions as the vehicle doors 40 . According to a further embodiment of the invention, the automatic shutdown of the internal combustion engine 2 is dependent on the further stop condition that a stop release of an air conditioning device 22 is present, which for the air conditioning of the motor vehicle passenger compartment 32 an example connected to the internal combustion engine or connectable unit in the form of a refrigerant compressor 44 and / or a blower 46 . If the air-conditioning device 22 has only one fan 46 , this only serves to convey fresh air from the outside atmosphere into the passenger space 32 . However, it is used depending on the climate setting for the promotion of fresh air, cooling air or hot air when the air conditioning 22 is an air conditioner and the refrigerant compressor 44 is provided.

A temperature sensor 48 of the stop-start device 16 detects in the passenger compartment 32, the temperature for maintaining a comfortable for the driver and possibly also for passengers temperature. A humidity sensor 50 of the stop-start device 16 detects in the passenger compartment 32, the humidity for maintaining a humidity in which the vehicle windows 52 , in particular the windshield, can not mist. Windshield fogging would be a dangerous driving condition when the engine starts automatically.

According to a further embodiment, the automatic shutdown of the internal combustion engine 2 by the stop-start device 16 also takes place as a function of the operating state of an oil system 56 for the transmission 6 (switching element actuation and / or cooling oil) and / or for a steering system 58 of the motor vehicle as Another stop condition, which must be fulfilled as an AND function simultaneously with all other stop conditions. The automatic shutdown of the internal combustion engine 2 is omitted, although all other stop conditions, but not this additional stop condition is met. The oil system includes at least one oil pump 24 and / or a pressure accumulator.

Fig. 3 shows on the horizontal axis the time and on the vertical axis different starting conditions for an automatic starting of the internal combustion engine after an automatic shutdown of the internal combustion engine by the stop-start device. At time t0, the internal combustion engine is in the automatically switched-off state or is switched off automatically. At time t1, at least one motor vehicle door is open, which is represented by a diagram line "S1". Simultaneously with the opening of the door, a start prohibit function is performed at time t1, which is shown by a diagram line "S2" and results in blocking the start function of the stop-start device at t1. At time t2, all doors are closed again, which also eliminates the start ban. Thereafter, at time t3, a start request is made by a driver of the motor vehicle, which is represented by a diagram line "S3". The start request may be communicated to the stop-start device 16 by the driver, for example, by releasing the vehicle brake and / or accelerating and / or by touching or actuating a gear selector element or another starting element, depending on the respective embodiment of the motor vehicle and the controller 14 . If all other start conditions provided are met, the automatic starting of the internal combustion engine by the stop-start device 16 takes place at the time t3 either simultaneously or with a delay, depending on the embodiment.

The embodiment of Fig. 3 has the advantage that the engine does not start automatically when the driver notifies his start request as a start condition of the stop-start device, although a vehicle door is open, e.g. When a child gets out.

Fig. 4 shows again t a horizontal time axis and a vertical axis situation or signal axis S.

At the time t1, a vehicle door is opened, which is shown by a diagram line "S1". Thus, a start prohibition is generated, which is represented by a diagram line "S2" and z. B. by a start prohibition signal can be realized, which causes a blocking of the start function or switching off the stop-start device. Thereafter, at the time t3, a start request of the driver, which is represented by a diagram line "S3", at a time at which the start prohibition "S2" still exists, since at least one motor vehicle door is open according to the diagram line "S1". The stop-start device is designed such that in this case (unlike in FIG. 3) the closing of all doors does not cancel the start prohibition "S2". Thus, since this start condition is not satisfied, the engine is not automatically started by the stop-start device, although the start request "S3" is still present. The stop-start device is designed in such a way that in this case it can no longer automatically start the internal combustion engine, even if all starting conditions are met. The internal combustion engine can now only be restarted and started so that the driver performs a complete restart of the internal combustion engine by restarting the internal combustion engine with the ignition key or another ignition element at time t4 according to the diagram line S4.

Example of FIG. 4: The driver stops the motor vehicle, which actuates the brake. The child gets out and leaves the door open. The driver leans to one side or turns back to close the vehicle door. He accidentally goes off the brake. Now, in the case of Fig. 3, the engine would be automatically started and started by the stop-start device as soon as the vehicle door is closed. Thus, the motor vehicle would start unintentionally in an automatic transmission, which could lead to an accident, for example at an intersection. The same situation according to FIG. 4 also occurs when the child closes the vehicle door himself, but the driver has previously accidentally released the vehicle brake. The term "brake" is used here generally for the normal vehicle brake as well as for a manually or by foot control detectable brake.

Fig. 5 shows a diagram for a method or a motor vehicle according to the invention, in which it was at the time t0 of the internal combustion engine by the stop-start device automatically switched off sixteenth At time t1, the driver's door is opened corresponding to the line S1, thereby automatically setting a start prohibit signal according to line S2 at the same time. Thus, the automatic stop-start function is overridden beyond the time t2 at which the driver's door is closed again, so that the engine is not automatically started at the further time t3, although at this time corresponding to the line S3, a driver's request is present for starting and thus with the exception of the start condition for the driver's door all other starting conditions are met. The internal combustion engine can not be restarted automatically in this situation, but only by a person according to the line S4 manually using ignition key or radio without the function of the stop-start device. This avoids that, after the driver has dropped out of the vehicle, children unintentionally, for example, by releasing the brake or pressing the accelerator pedal 34 , start the engine. This shows that embodiments of the invention are possible in which not all vehicle doors, but only the driver's door is monitored and their condition is considered as a start condition and / or as a stop condition.

In order to reduce unnecessary fuel consumption at intermediate stops, when the motor vehicle is, an automatic stop-start operation of the internal combustion engine 2 is controlled by the electronic control device 14 and the stop-start device 16 . The function is performed on the basis of a priority list. The highest priority is safety, followed by comfort and maximum fuel economy.

When deciding on an "automatic shutdown" of the internal combustion engine, at least one, preferably several, of the stop conditions mentioned in the patent application, optimally all stop conditions, in each case in AND operation, must be fulfilled simultaneously, for example:

• 1. Hood closed.
• 2. Motor vehicle is standing, the vehicle speed equals zero or zero, for example is less than or equal to 0.5 km / h.
• 3. Accelerator not actuated.
• 4. brake element, z. B. brake pedal or manual lockable brake or foot parking brake actuated.
• 5. All vehicle doors and preferably also a trunk door or a trunk lid, or at least the driver's door, are closed.
• 6. In the case of an automatic transmission, the selector lever is on a driving position, z. B. D, or on one Neutral position, z. B. N.
• 7. The temperature of the exhaust system (eg Catalyst temperature) has reached its operating value.
• 8. The internal combustion engine (oil temperature and Cooling water temperature) has its operating temperature reached.
• 9. The transmission or transmission oil has operating temperature reached and the pressure supply and thus the Switchability of the transmission and the avoidance of a  Overheating in the gearbox is also with the engine off ensured.
• 10. From the climate control of an air conditioning, z. B. Cooling fan and / or air conditioning of the motor vehicle is located a release, by which it is ensured that for example, the humidity in the motor vehicle in Order is that the vehicle windows can not fog up, and the temperature inside the vehicle within a acceptable tolerance range.
• 11. There is a release by a battery Control device, by which, for example it is ensured that the state of charge of Vehicle battery is good enough to one automatic or manual restart of the Ensuring internal combustion engine and also good enough is to any existing other power consumers of the motor vehicle during the stophase sufficiently with Supply electricity.
• 12. Any appropriate, and, where appropriate variable, delay time before activating the MotorStops (switching off the internal combustion engine) is expired, without the driver a start request to the Drive device has communicated, for. B. by loosening the Brake and / or accelerator and / or touch or press a gear selector element. A scheduled delay time for switching off the internal combustion engine is used For example, as Rangierschutz, z. B. before inserting a reverse gear, so that the engine is not automatically shut off when the vehicle is not on a traffic light or in a city traffic, but stopped for maneuvering or reversing has been. By being able to increase the delay time shorten or skip by the driver of the Motor vehicle his driving desire of the drive device communicates, for example, by touching a transmission Selector lever or another element, is also a  speedy recovery in short stops, z. For example Turn off while oncoming traffic allows.
• 13. An on-off switch for optional manual switch-on and switching off the stop-start function is on the power-on Condition, not in the off state.

advantages

By the functions of the numbers 1 to 6 and 12 , the necessary security (protection against incorrect operation) and a comfortable, simple and intuitive operation of the motor vehicle or its functions is guaranteed. Number 12 optimizes the function according to the driver's request, the driving style, the desired speed profile and the route. By the numbers 7 , 8 and 9 unnecessary cold starts and thus consumption, exhaust and wear disadvantages are prevented. By 11 deterioration of the availability and reliability of the starting process of the motor vehicle is prevented. By 10 prevents an unpleasant high humidity in the passenger compartment of the vehicle is produced and / or dampen the vehicle windows damp and thereby the driver loses sight.

The said delay time for the automatic shutdown of the internal combustion engine in a vehicle stop is preferably variable and is preferably influenced by the following parameters, wherein a short delay time means an early shutdown of the internal combustion engine, and a long delay time a later shutdown of the internal combustion engine means:

• 1. Due to the selection of an operating mode by the driver, z. B. via an economy selector switch or selector switch. In this case, an activation on the economy dial a small delay time and deactivation on economy Dialing cause a large delay time, the Delay time to be infinitely adjustable can.  
• 2. Due to the previous driving: Sporty driver with large pedal gradients (large and / or frequent Pedal movements of the accelerator pedal and / or the brake pedal per Time unit) give a large delay time, and economical drivers with small pedal gradients result in one small delay time.
• 3. Due to the speed profile covered: High Speeds, z. B. greater than 100 km / h, highway or Highway, resulting in a large delay time; small Speeds, z. B. less than 60 km / h, z. In the City traffic or stagnant traffic, make a small Delay Time; in between can mean Delay times are.
• 4. Based on navigation data of a navigation system or a traffic control system or digital road maps, for example, traffic jams a small Delay time can result. When the traffic flow is blocked, the internal combustion engine, provided the remaining driving conditions are fulfilled, immediately be switched off. In turn situations and Junction situations can have big delay times Be set to a disturbing shutdown in one Turning situation or crossing situation to prevent.
• 5. Brake Pedal Angle: Small pedal actuation angle by the Brake pedal is slightly down, can be used for adjustment a large delay time can be used; size Brake pedal operating angle by the brake pedal strong is stepped, can a small delay time cause. However, the driver can over the brake pedal the Intuitively influence and control the function. The "Brake pedal" is just one example of each type of Vehicle brake elements and vehicle Parkblockiereinrichtungen, such as a manual Vehicle parking brake or a foot parking brake.

When deciding to automatically start the internal combustion engine after an automatic stop, at least one or preferably more than one of the starting conditions mentioned in the sub-combination or preferably all of the patent applications must be fulfilled simultaneously as an AND function:

• 1. Hood closed: protection during maintenance or Workshop activities. Example: The driver drives his vehicle in the workshop or garage, stop, open the Hood lock, and while the mechanic is straight engages in the engine compartment, the driver leaves the brake pedal What is normally a signal for the automatic Start and thus the automatic restart of the Internal combustion engine is. In this case, it may not be too come an engine restart.
• 2. brake actuator, z. B. Brake pedal: When the vehicle brake (foot brake, handbrake, manual or foot-operated parking brake) is activated in the stop phase, the combustion engine is started independently of the brake pedal position when the accelerator pedal is depressed or when the vehicle brake is released. If the vehicle brake has not been actuated during the stophase, the following point 3 applies.
• 3. Brake pedal not actuated (released) or Vehicle speed exceeds a threshold, z. B. 5 km / h. This second case may still occur actuated brake pedal and idling the motor vehicle due to a heavy road gradient.
• 4. All vehicle doors must be closed, preferably also a trunk door or a boot lid, or at least the driver's door.
• 5. For an automatic transmission, the selector lever position must ever according to embodiment of the motor vehicle in one Forward driving position, z. B. D, or to neutral position, for. B. N, or parked, z. B. P, be.
• 6. Driver's seatbelt is worn and / or the buckle is closed: To rule out that the driver a unwanted engine start triggers unintentionally the Vehicle brake releases and / or presses the accelerator pedal, for example, by the driver in the vehicle on the  Passenger seat slipped over to z. B. another driver To make room and thereby the brake is off, or the on driver sitting in the driver's seat turns around and backwards Look, for example, to get something from a backseat or busy there with a child. In such Cases an automatic engine start only at Actuation of the accelerator pedal is triggered, even if the Driver did not put on the seatbelt or that Belt buckle has not closed.

expansion options

Triggering a motor stop already in deceleration phases or Coasting phases of the motor vehicle to fuel consumption to reduce. However, the prerequisite for this is that the Brake and steering unrestricted with the engine off remain functional. If this is not possible, then may according to another embodiment, an intermediate solution be provided, in which not only the full Vehicle stop, but already while rolling out the Motor vehicle is an automatic engine stop, however with subsequent actuation of the brake or the steering during the motor vehicle coasting an immediate Engine restart automatically done. Furthermore, it can be provided automatically stop the engine only when the hill- hold function to roll back the To prevent motor vehicle. Furthermore, according to a be provided further embodiment that a automatic restart of the automatically switched off Internal combustion engine only when the accelerator pedal or another gas actuator takes place independently of which, whether manually (handbrake) or by foot control actuated vehicle brake, z. B. parking brake, in Braking condition is or not. The advantage here: the normal Vehicle brake, which is not for the determination of Motor vehicle serves, does not have constantly by the foot one Driver be kept pressed.

Claims (7)

1. A method for automatically switching off and starting an internal combustion engine ( 2 ) of a motor vehicle by means of a stop-start device ( 16 ) through which the internal combustion engine ( 2 ), after starting the internal combustion engine ( 2 ) by a person and driving the Motor vehicle with annealed internal combustion engine ( 2 ), stopping the motor vehicle and the simultaneous presence of certain stop conditions as AND function, to which at least the actuation of a motor vehicle brake ( 38 ), a vehicle standstill or a vehicle standstill nahte hete low vehicle speed and the presence of a Stop-release state of an air conditioner ( 22 ), is automatically switched off, and then automatically restarted as UND-function simultaneous existence of certain starting conditions, the automatic shutdown of the internal combustion engine ( 2 ) by a stop function and the after taking place au to matic tempering of the internal combustion engine ( 2 ) by a start function of the stop-start device ( 16 ), characterized in that the presence of the stop-release state of the air conditioning device ( 22 ) from a detected in the passenger compartment humidity and / or temperature depends. 2. The method according to claim 1, characterized, that the humidity in the passenger compartment by at least a sensor is detected and depending on the detek value of the stop release state Climate control device is then met when the detek value is below a predetermined maximum value, and / or that the temperature in the passenger compartment of the motor tool is detected by at least one sensor and in  Depending on the detected value of the stop release Condition is satisfied when the detected value is inside is half a predetermined tolerance range. 3. The method according to claim 1 or 2, characterized, that one of the stop conditions, equal to the AND function must be fulfilled in time, is that the Climate control device, which between automatic mode and individual operation of a person is switchable to Automatic mode is set, and that when setting on individual operation the stop condition is canceled, that the stop release state must be present for the automa shutdown of the internal combustion engine. 4. The method according to at least one of the preceding Ansprü che, characterized, that the air conditioning of a person in Perso is switched on, while the internal combustion engine in the automatically shut off, and then at least during the entire automatic shutdown of the Internal combustion engine remains switched on. 5. The method according to at least one of the preceding Ansprü surface, characterized in that the function of the automatic shutdown and / or the automatic starting of the internal combustion engine ( 2 ) of the wei direct as a function of the respective operating state of a hood ( 26 ). 6. The method according to at least one of the preceding Ansprü che, characterized in that at least the driver's door (40), or several or all vehicle doors (40) of the stop-start device (16) are monitored as to whether they are closed or open, and that the automatic shutdown and / or the automatic Anlasse the internal combustion engine ( 2 ) further in depen dence of whether the respective motor vehicle door or relevant motor vehicle doors are closed or at least one vehicle door is open. 7. The method according to at least one of the preceding Ansprü surface, characterized in that the automatic shutdown of the internal combustion engine ( 2 ) by the stop function of the stop-start device ( 16 ) further depending on the operating state of a Ölsys system ( 56 ) of a Fahrantriebsgetriebes ( 6 ) takes place as another stop condition, which must be met as AND function simultaneously with all other stop conditions, the automatic shutdown of the engine ( 2 ) un survives, although all other stop conditions, but not this further stop condition is met.