DE102010003673A1 - Method for operating vehicle, involves providing gear recommendation with application of accelerator pedal after free-run operation between gear box and drive motor - Google Patents

Abstract

The method involves providing a gear recommendation with an application of an accelerator pedal (18) after the free-run operation between a gear box (6) and a drive motor (4). The current drive speed of the drive motor is accelerated to a recommended drive speed, where the recommended speed corresponds to the gear recommendation in a current speed situation of the vehicle (2). An independent claim is also included for an arrangement for operating a vehicle.

Description

The invention relates to a method and an arrangement for operating a vehicle.

State of the art

When performing a freewheel for a vehicle, which is referred to as a so-called sailing operation, the driveline between a transmission input and a drive motor is opened or a neutral gear used so that the vehicle can exploit the kinetic energy for rolling out. Meanwhile, the drive motor is turned off to save fuel. If the driver accelerates the vehicle from sailing again, closing the driveline without proper speed increase will result in a strong uncomfortable deceleration.

In an automatic transmission is, as from the publication DE 100 31 771 A1 It is known, during a starting process, increases the torque transmittable by the clutch and typically controlled to a predetermined value for the torque. This allows a more comfortable start of the vehicle can be realized. However, the vehicle must be at a standstill for this purpose. However, the method described in said document is not suitable for the sailing operation in an acceleration process to a higher speed.

Disclosure of the invention

Against this background, a method and an arrangement with the features of the independent claims are presented. Further embodiments of the invention will become apparent from the dependent claims and the description.

In one embodiment of the method, a gear recommendation for a manual or automatic shift of a transmission and a speed adaptation of a drive motor of the vehicle are provided during a switch-on or a starting operation of a trained as an internal combustion engine drive motor after sailing.

With the invention, a comfortable transition of a freewheeling operation, which is commonly referred to as sailing operation, in the normal operation in which a coupling between the drive motor and the transmission input is ensured.

As part of the method, a delay-free engagement is made possible in an operation of the vehicle, for which a freewheel between the transmission and drive motor and thus a sailing operation is provided. To provide the sailing operation or the freewheeling operation, a drive train between the transmission input and the drive motor is interrupted by a clutch and thus the transmission input is decoupled from the drive motor. In normal operation, the transmission input and the drive motor are connected to each other via the drive train via the clutch and thus coupled.

Upon actuation of an accelerator pedal, namely the accelerator pedal in an automatic transmission or the clutch pedal in a manual transmission, after the freewheeling operation or after a freewheeling phase in one embodiment of the invention, the first transmission to the driver and / or the arrangement or a corresponding system a gear recommendation and then the engine speed via a speed control accelerates to that speed, which corresponds to the current speed of the gear recommendation. The gear recommendation is also transmitted and displayed during the sailing phase or during the sailing operation.

In the freewheeling phases, the internal combustion engine is optimally switched off. The gear recommendation can be selected depending on the speed of the vehicle and / or the gradient of the speed and thus the local change in the speed of the vehicle.

So that the driver and / or the automatic transmission is informed about which gear after sailing operation, d. H. the freewheel between transmission input and drive motor when the internal combustion engine is switched off, either manually and / or automatically insert, this gear to be engaged with the arrangement or a corresponding system, starting from the speed situation, d. H. the speed and / or the gradient, determined and displayed to the driver in a manually switched transmission.

Subsequently, a speed matching the recommended gear is set so that the vehicle and the driver are exposed to as little inappropriate deceleration or acceleration torque as possible.

In the case of the transmission to be manually shifted, the driver also notices on the basis of the change in the rotational speed that he has possibly chosen a gear other than the recommended gear. Usually, the switching on and increasing the speed of the internal combustion engine in the case of the manual or manual transmission are triggered by the clutch pedal and thus triggered.

In the automatic transmission, the switching on and increasing the speed of the internal combustion engine are triggered by the accelerator pedal. Here too, depressing the brake pedal may cause the engine to couple to the transmission to minimize mechanical brake losses.

Depending on the speed situation, a recommended gear is determined continuously during the sailing operation and displayed to the driver in the case of the manual transmission. This gear, the driver can engage or the automatic transmission can set this recommended gear, after starting the engine by the driver via the accelerator pedal in an automatic transmission, eg. In D position, or the clutch in a manual transmission of the arrangement or The system is requested.

The invention comprises, in an embodiment, the arrangement for a vehicle for the automated actuation of a clutch in the drive train of the vehicle, which comprises the drive engine and the transmission. The arrangement comprises a control unit and an actuator controlled by the control unit for actuating the clutch. During operation of the arrangement, the torque transmittable by the clutch is increased starting from a current actual value M _k when the accelerator pedal is actuated and is typically adjusted to a setpoint value M _soll for the torque which is predetermined by the control unit and corresponds to the gear recommendation. It is provided in one embodiment that the transmittable torque of the clutch can be increased at least in the short term before reaching the speed equality between the speed of the motor and the speed of the transmission and lowered again.

In the context of the invention, a gear recommendation and a speed adaptation are provided during a switch-on process of a drive motor, which is usually designed as an internal combustion engine, after the sail operation.

The gear recommendation (G) or gear shift recommendation is usually a function that depends on the speed (v) and the gradient of the speed (v '): G = F (v, v ').

From the gradient of the speed of the arrangement of the reason for the termination of the sailing operation can be determined. This can be z. B. then be the case when the vehicle reaches a slope or comes from a slope. Thus, there is a spatial change of the velocity represented by the gradient of the velocity.

Depending on the vehicle and transmission, the gear recommendations or a recommendation for a gear "Gx" vary, where x stands for the number of a particular gear or gear ratio. Thus, depending on the speed v, for example, the following courses "Gx" can be proposed:
G1, if 0 km / h <v <15 km / h,
G2, if 15 km / h <v <40 km / h,
G3, if 40 km / h <v <65 km / h,
G4, if 65 km / h <v <90 km / h,
G5 if 90 km / h <v.

In the event that the gradient of the speed v 'is much smaller than a normal coasting value of the vehicle depending on speed, a gear ratio is less recommended, since the vehicle is in a desired deceleration situation and the higher torque of the engine used for further deceleration can be.

If this gradient v 'is much larger than a normal coasting value of the vehicle depending on the speed, one gear step should be made smaller so that the smaller gear step with a higher torque can be further accelerated.

In a manual gearbox or an automatic transmission, the gear speed (nmot) of the drive motor is now set to this gear recommendation when pedaling the clutch, in the manual transmission, or when activating the accelerator pedal, in the automatic transmission, before the clutch is closed.

In one example, the speed v = 60 km / h, so z. For G = 3 and i * R = 0.4 m, d. H. Transmission ratio · tire circumference, a speed nmot = v / (i · R) = 60 km / (60 min · 0.4 m) = 2506 1 / min

With the invention, a speed or torque adjustment can be achieved for a switching operation from the sailing operation in order to prevent or at least reduce an otherwise usual delay in a starting process in the manual transmission, for example in the manual transmission.

For a CVT transmission (Continuously Variable Transmission) or for a continuously variable transmission, the above method can be varied in such a way that first as large a gear ratio before the adhesion between the drive motor and the transmission input and thus the transmission is switched and then dependent from the velocity v, the gradient v 'of the velocity and the position of the usually designed as an accelerator pedal accelerator pedal is adjusted continuously.

The arrangement according to the invention is designed to carry out all the steps of the presented method. In this case, individual steps of this method can also be carried out by individual components of the arrangement. Furthermore, functions of the arrangement or functions of individual components of the arrangement can be implemented as steps of the method. In addition, it is possible for steps of the method to be realized as functions of at least one component of the arrangement or of the entire arrangement.

Further advantages and embodiments of the invention will become apparent from the description and the accompanying drawings.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination indicated, but also in other combinations or in isolation, without departing from the scope of the present invention.

Brief description of the drawings

1 shows a schematic representation of a vehicle with an embodiment of the inventive arrangement in carrying out a first embodiment of the method according to the invention.

2 shows a flowchart to a second embodiment of the method according to the invention.

3 shows a detail of the flowchart 2 ,

Embodiments of the invention

The invention is schematically illustrated by means of embodiments in the drawings and will be described in detail below with reference to the drawings.

The figures are described in a coherent and comprehensive manner, like reference numerals designate like components.

1 shows a schematic representation of a vehicle designed as a motor vehicle 2 with a drive motor designed as an internal combustion engine 4 , a gearbox 6 and a drive wheel 8th , Here is a motor shaft 10 of the drive motor 4 and a transmission input 12 of the transmission 6 , which can also be referred to as a drive train, via a clutch 14 connectable with each other. Furthermore, the transmission 6 and the drive wheel 8th via a drive shaft 16 connected with each other.

The vehicle 2 also includes one from a driver of the vehicle 2 to be operated accelerator pedal 18 , In the context of possible embodiments of the invention is used as an accelerator pedal 18 either a clutch pedal if the vehicle 2 a manual transmission to be switched 6 has, or an accelerator pedal, if the vehicle 2 an automatic transmission to be switched 6 has used.

1 further shows an embodiment of an arrangement according to the invention 20 that are inside the vehicle 2 is arranged. This arrangement 20 includes as components a control unit 22 , a sensor 24 , a first actuator 26 , which is designed to be the drive motor 4 to act on, as well as a second actuator 28 which is designed to handle the clutch 14 to act on.

It is intended that the vehicle 2 is operated in a freewheeling operation, wherein the drive motor 4 from the transmission 6 is decoupled. This is the coupling 14 open so that between the drive motor 4 and the transmission 6 no power transmission takes place. Furthermore, it is provided that in this freewheeling operation of the drive motor 4 is switched off. The described freewheeling operation can also be referred to as so-called sailing operation.

Furthermore, it is provided that the described first embodiment of the method according to the invention by actuation of the accelerator pedal 18 is started by the driver. After pressing the accelerator pedal 18 is through the sensor 24 a speed situation of the vehicle 2 certainly. With the speed situation become current kinematic parameters of the vehicle 2 determined.

In this case, a first such kinematic parameter is the current speed of the vehicle 2 , As a second kinematic parameter, a gradient of the velocity and thus a local derivative of the velocity is provided. Among other things, the gradient of the speed can be used to determine which course of elevation a road is that of the vehicle 2 currently has. By detecting the gradient of the speed, it is thus possible to determine whether the vehicle 2 uphill or up a slope, on a straight road without altitude change or downhill and thus descending a slope.

The parameters for the current speed situation are from the sensor 24 to the control unit 22 transmitted. Considering the speed situation, ie taking into account the speed and the gradient of the speed, is after the freewheeling phase or the freewheeling operation of the control unit 22 a gear recommendation for the motor driven driving of the vehicle 2 provided. It is from the control unit 22 automatically decide with which gear the motor-driven drive is continued.

If the vehicle 2 a manual transmission 6 the gear recommendation is visually and / or acoustically displayed to the driver, so that the driver can engage the recommended gear.

If the vehicle 2 an automatic transmission 6 has, becomes the second actuator 28 from the control unit 22 controlled and thus the second actuator 28 communicated the recommended, recommended gear, so that by the second actuator 28 controlled clutch 14 the recommended gear is engaged.

In addition to the gear recommendation will continue to the drive motor 4 associated first actuator 26 , which is also a control unit of the drive motor 4 can act, driven. Taking into account the recommended gear is a current speed of the drive motor 4 accelerates to a recommended speed corresponding to a common speed of the recommended gear.

By measures provided in the context of the method according to the invention, a smooth and / or delay-free restart of the vehicle after completion of the freewheeling operation 2 allows.

With the described arrangement 20 to operate the vehicle 2 , is activated when the accelerator pedal is pressed 8th after the freewheeling phase or after the freewheeling operation, the gear recommendation or gear shift recommendation provided and the current speed of the drive motor 4 accelerated to the recommended speed, which at the current speed situation of the vehicle 2 the gear recommendation corresponds.

2 shows a flowchart for a second embodiment of the method according to the invention, this flowchart in an upper first sub-diagram 40 and a lower second subdiagram 42 is divided. Both partial diagrams 40 . 42 is an abscissa for the time 44 assigned.

The upper first part diagram 40 are also five ordinates 46 . 48 . 50 . 52 . 54 Here are along a first ordinate 46 Speeds "nmot_w" of the drive motor are applied per minute. These speeds "nmot_w" are within the first subdiagram 40 through the first bend 56 represents. Along a second ordinate 48 a speed "vfzg_w" of the vehicle is plotted in kilometers per hour. Furthermore, this speed is through a second curve 58 within the first subdiagram 40 represents. Along a third ordinate 50 are percentage values "wped_w" for how much an accelerator pedal of the vehicle is depressed. Values for this are the third curve 60 of the first subdiagram 40 out 1 shown. Along a fourth ordinate 52 Values for a gear of a transmission of the vehicle are displayed. This is shown by a fourth curve 62 within the first subdiagram 40 a gear recommendation "gangsolstrt" and a fifth curve 64 a currently engaged gear "gangi". Along a fifth ordinate 54 is indicated whether a selector lever is in a neutral position "Gbx_stNPos", which is in the first partial diagram 40 based on the sixth curve 66 is shown.

In the lower part diagram 42 are a seventh turn on top of each other 68 for a "B_brems" bit and thus for a brake pedal position, an eighth turn 70 for a "B_kuppl" bit indicating the position of the clutch and a ninth turn 72 for a "B_II" idle bit whose value is 1 if the speed is below a threshold and whose value is otherwise 0. Accordingly, the ninth curve shows 72 the condition for idling from the driver's perspective. In this case, the "B_II" bit is 1 or "TRUE" if the gas pedal is not actuated.

A tenth turn 74 stands for a "B_staanf" bit of a start request, an eleventh turn 76 for a "b_stoanf" bit for a stop request and a twelfth curve 78 B_stend bit for a start. If the start is completed and the engine speed is above a defined threshold, the value of the "B_stend" bit is 1, otherwise 0.

By the double arrow 80 is for the part diagrams 40 . 42 given a time interval of 10 seconds. A through the brace 82 indicated portion of the flowchart refers to a detail of the flowchart 2 that in the following 3 is shown enlarged.

The flowchart off 3 put that through the brace 82 indicated detail of the flowchart 2 This is shown by an upper partial diagram 86 out 3 a detail of the first upper subdiagram 40 out 2 , A second lower part diagram 88 in 3 shows a section of the second lower subdiagram 42 out 2 , In the 3 is as a scale by a double arrow 84 a time interval of one second is displayed.

The flowcharts from the 2 and 3 show that the engine designed as a drive motor initially has a speed n_mot = 0. Then, the speed after starting is set to the recommended third gear. At a speed> 50 km / h, the recommended fourth gear is set.

This embodiment of the method takes place only after the sailing operation has been used a defined time and not in normal switching operations, eg. B. in a conventional acceleration from the third to the fourth gear.

Within the scope of the invention, an extended functionality can also be provided. Thus, a stop request is made when a gear N is engaged, the clutch pedal is released, and the vehicle speed is less than a threshold of about 100 km / h. A start request takes place when a trained as a clutch pedal accelerator pedal is stepped again, which is usually the case when the clutch pedal has already passed through to about 10%. A gear recommendation and a speed-dependent speed increase of the internal combustion engine takes place after the restart from the sailing operation.

Transmissions of modern vehicles are constructed such that a transmission of such a vehicle has an automatic part and a manual part, and can be switched back and forth between the automatic part and the manual part according to the preference of the driver. Thus, it is possible to switch the gears of such a vehicle alternately either manually or automatically and thus to operate alternately with either an automatic transmission or a manual transmission. Depending on the type of shift, the procedure for this vehicle can be triggered by operating the clutch pedal or the accelerator pedal.

In a further embodiment, it can be provided that not only the depression of the accelerator pedal but also the tapping of the brake, usually at a previously positive gradient of the speed, can end the sailing operation (freewheeling). Also in this case, the drive motor is accelerated by increasing the speed until it is synchronized.

This option is, for example, for vehicles with automatic transmission u. a. provided in case, if the vehicle in sailing operation (freewheeling) approaches a steep gradient and the driver requires a fuel cut and does not want to accelerate.

How a driver reacts to a red traffic light depends on the speed of the vehicle.

In a manual transmission, the clutch is operated by the driver, whereby the drive motor is automatically switched on. Only at high speeds, the drive train is switched on.

The gear selection when pressing the brake and when connecting the drive train can be selected differently than when pressing the accelerator pedal. This can usually be done by switching a lower gear to activate the engine brake.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 10031771 A1 [0003]

Claims (10)

Method for operating a vehicle ( 2 ), for which a freewheeling operation between a transmission ( 6 ) and a drive motor ( 4 ) is provided, in which when pressing an accelerator pedal ( 18 ) provided a gear recommendation after the freewheeling operation and a current rotational speed of the drive motor ( 4 ) is accelerated to a recommended speed, which at a current speed situation of the vehicle ( 2 ) corresponds to the gear recommendation. The method of claim 1, wherein initially provided the gear recommendation and subsequently the current speed is accelerated to the recommended speed. Method according to Claim 1 or 2, in which the speed situation causes a speed of the vehicle ( 2 ) is taken into account. Method according to one of the preceding claims, in which the speed situation causes a gradient of the speed of the vehicle ( 2 ) is taken into account. Method according to one of the preceding claims, wherein in the event that the vehicle is equipped with a manual transmission ( 6 ), a provision of the gear recommendation with a trained as a clutch pedal accelerator pedal ( 18 ) and a recommended gear is displayed to a driver. Method according to one of the preceding claims, in which, in the event that the vehicle is equipped with an automatic transmission ( 6 ), a provision of the gear recommendation with an accelerator pedal designed as an accelerator pedal ( 18 ) and the automatic transmission ( 6 ) is driven to implement a switching operation in a recommended gear. Method according to one of the preceding claims, in which the drive motor ( 4 ) is turned off in a freewheeling phase and restarted by adjusting the speed. Method according to one of the preceding claims, which is for a vehicle ( 2 ) with a drive motor designed as an internal combustion engine ( 4 ) is carried out. Method according to one of the preceding claims, in which, during the freewheeling operation, a gear to be recommended by the gear recommendation is determined continuously. Arrangement for operating a vehicle ( 2 ), for which a freewheeling operation between a transmission and a drive motor ( 4 ), in which the arrangement ( 20 ) is designed, when operating an accelerator pedal ( 18 ) provide a gear recommendation after the freewheeling operation and a current rotational speed of the drive motor ( 4 ) to accelerate to a recommended speed, which at a current speed situation of the vehicle ( 2 ) corresponds to the gear recommendation.

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