JP6071170B2 - Vehicle operation method - Google Patents

Description

  The present invention relates to a method for operating a vehicle and an apparatus therefor.

  When carrying out inertial running, also called the so-called coasting mode of the vehicle, the drive train between the transmission input side and the drive engine is dissociated or a neutral stage is used, whereby the vehicle is coasted You can use up the kinematic energy for. Meanwhile, the drive engine is shut off to save fuel. When the driver accelerates the vehicle again from this repulsive driving mode, the drive train is closed again. In this case, unintentional braking may be caused by an unintended increase in the rotational speed.

  For example, in an automatic transmission such as is known from German Offenlegungsschrift 100 31 771, the torque transmitted by the clutch is increased during the start-up process, a typical approach for this torque. Is controlled to a predetermined value. As a result, a comfortable start of the vehicle is realized. In any case, for this departure, the vehicle must be stopped. However, the method described in the above-mentioned known document is an acceleration process up to a higher speed and is not necessarily suitable for the repulsive driving mode.

German Patent Application Publication No. 100 31 771

  An object of the present invention is to make improvements in order to solve the disadvantages in the prior art as described above.

  According to the present invention, there is provided an inertia traveling mode section between the transmission and the drive engine, and when the accelerator pedal is operated after the inertia traveling mode has elapsed, a recommended shift stage is prepared and the current state of the drive engine is determined. The recommended engine speed is accelerated to the recommended engine speed, and the recommended engine speed is solved by corresponding to the recommended gear position under the current speed condition of the vehicle.

Schematic diagram of a vehicle equipped with a device according to the invention for carrying out a first embodiment of the method according to the invention Flowchart representing a second embodiment according to the present invention. The figure which showed the detail of the flowchart of FIG.

  According to the embodiment of the present invention, in the ignition switch-on process or the start process of the drive engine configured as the internal combustion engine after the inertial running mode, the recommended shift stage for the manual shift or the automatic shift of the transmission and the vehicle An adaptation of the speed of the drive engine is provided.

  According to the present invention, a comfortable transition from an inertial traveling mode, also referred to as a so-called inertial traveling mode, to a normal traveling mode in which a clutch is connected between the drive engine and the transmission input side is ensured. Become.

  Within the framework of the present invention, coasting or coasting is carried out between the transmission and the drive engine, enabling clutch connection without braking action. When providing coasting or coasting, the drive train between the transmission input side and the drive engine is interrupted by the clutch, and accordingly the transmission input side is disconnected from the drive engine. In the normal mode, the transmission input side and the drive engine are connected to each other via a drive train and a clutch, and are thereby connected.

  If the travel pedal is operated after the elapse of the coasting mode or coasting period, in particular if the accelerator pedal is operated in the case of an automatic transmission and the clutch pedal is operated in the case of a manual transmission According to the configuration of the invention, first, the recommended gear is notified to the driver and / or the device or the corresponding system, and then the engine speed is increased to the following speed through the speed control. In other words, the engine speed is accelerated to a speed corresponding to the recommended gear position under the current speed. The recommended shift speed is transmitted and displayed during the repulsive operation mode or the repulsive operation period.

  During the inertial running period, the internal combustion engine is stopped in an optimal manner. There, the recommended gear is selected depending on the speed of the vehicle and / or the gradient and local changes of the speed of the vehicle.

  After the coasting mode in which the internal combustion engine is stopped, that is, after coasting, which gear stage should be turned on by manual operation and / or automatic operation between the transmission input side and the drive engine In order to provide information to the driver and / or the automatic transmission, the relevant gear position is determined by the corresponding device or the corresponding system on the basis of the speed situation, i.e. the speed and / or its gradient, and the manual shift Displayed to the driver in the transmission to be operated.

  Subsequently, the engine speed and the recommended speed are set so that the vehicle and the driver are exposed to unpleasant braking torque or acceleration torque as little as possible.

  In the case of a manual shift transmission, the driver notices that he has selected a shift stage different from the recommended shift stage in some cases based on the change in the rotational speed. Normally, the starting of the internal combustion engine and the increase in the rotational speed are solved by triggering by a clutch pedal in the case of a manual shift transmission.

  In the case of an automatic transmission, the start of the internal combustion engine and the increase in the rotational speed are triggered and resolved by an accelerator pedal. Here, in order to minimize mechanical braking loss, the operation of the brake pedal also causes the coupling between the internal combustion engine and the transmission.

  During the inertial running mode, the recommended shift speed is continuously obtained according to the speed condition, and is displayed to the driver in the case of a manual transmission. If the gear is input by the driver or the automatic transmission sets the recommended gear, and the start of the internal combustion engine is an automatic transmission, the accelerator pedal is driven by the driver at the drive position (D), for example. In the case of a manual transmission, clutch operation is required by the device or system.

  The present invention, in its configuration, includes a vehicle device for automated clutch operation in a drive train of a vehicle that includes a drive engine and a transmission. This device has a control unit and an actuator for clutch operation controlled by the control unit. During operation of this device, the torque transmitted by the clutch is increased from the current actual value M under the operation of the accelerator pedal during the starting process and is typically set by the control unit. The torque target value Msoll corresponding to the recommended shift speed is controlled. According to an advantageous embodiment in this case, the torque that can be transmitted by the clutch can be increased and reduced again for at least a short period before the coincidence between the engine speed and the transmission speed is achieved. .

  According to the present invention, the recommended shift speed and the rotational speed coincidence are provided in the ignition switch-on process after elapse of the repulsive driving mode of the drive engine configured as a normal internal combustion engine.

The recommended shift stage (G) or the recommended shift change is usually a function depending on the speed (v) and the speed gradient (v ′) as follows:
G = F (v, v ′)
It is represented by

  From the speed gradient, a reference for the end of the repulsive travel mode is determined by the device. This may be the case as follows, for example. That is, when the vehicle reaches a hill or a gradient is generated. This results in a spatial or local change in velocity that can be represented by a velocity gradient.

The recommended shift speed “Gx” (x is a numerical value of each shift speed in this case) or the recommended shift speed is changed depending on the vehicle and the transmission. Thus, for example, depending on the speed v, the following gear stage “Gx” is proposed:
When 0 km / h <v <15 km / h, gear G1
In case of 15 km / h <v <40 km / h, gear stage G2
For 40 km / h <v <65 km / h, shift stage G3
In the case of 65 km / h <v <90 km / h, gear stage G4
In the case of 90 km / h <v, the gear stage G5.

  If the speed gradient v 'is much smaller than the rolling speed value at which the vehicle gradually stops depending on the speed, a lower gear is recommended. This is because the vehicle is in a desired braking situation, and higher engine torque can be effectively utilized for further braking.

  If this speed gradient v 'is much larger than the rolling speed value at which the vehicle gradually stops depending on the speed, a lower gear position is selected. This lower gear allows acceleration with greater torque.

  In the case of a manual-shifted transmission or an automatic transmission, the rotational speed (nmot) of the drive engine with respect to the recommended shift speed is determined. In this case, it is set before the clutch is engaged by operating the accelerator pedal.

For example, if the speed is v = 60 km / h, the gear stage G = 3, and i × R (that is, the gear ratio × the tire circumferential surface length) = 0.4 m,
Number of revolutions nmot = v / (i × R) = 60 km / h (60 min × 0.4 m) = 2500 1 / min
Is obtained.

  According to the present invention, rotation speed adaptation or rotation speed adaptation can be obtained for the shift process from the repulsive driving mode. The braking action normally occurring in the process of starting the manual transmission in the prior art is now eliminated or at least reduced.

  For a CVT (Continuously Variable Transmission) transmission or a continuously variable transmission, the method described above can be modified as follows. That is, first, before the friction coupling between the drive engine and the transmission input side, a gear ratio as large as possible is set in the transmission, after which the speed v and the speed gradient v ′ and usually travel configured as an accelerator pedal. It is changed to be adjusted depending on the position of the pedal.

  The device according to the invention is configured such that all of the method according to the invention can be carried out. The individual steps of the method according to the invention can then also be carried out by the individual components of the device according to the invention. Furthermore, the function of the device or the function of the individual components of the device may be replaced as a step of the method according to the invention. In addition, the steps of the method according to the present invention may be realized as a function of at least one component of the apparatus, or may be realized as a function of the entire apparatus.

  Further advantages and embodiments of the present invention will become apparent from the following specification and any drawings.

  It should be noted that the features described above and described in detail in the following specification are not only used in any particular combination, but also can be used alone without departing from the scope of the present invention. I want you to understand.

  The invention is explained in detail in the following specification based on embodiments shown schematically in the drawings. The description will be continued below based on the reference numerals attached to the drawings.

  The drawings are shown in an integrated and comprehensive manner, and like components are given like reference numerals.

  In FIG. 1, a vehicle 2 configured as an automobile is depicted together with a drive engine 4 configured as an internal combustion engine, a transmission 6, and drive wheels 8. Here, the engine shaft 10 of the drive engine 4 and the transmission input side 12 of the transmission 6 can be connected to each other via a clutch 14 (also referred to as a drive train). Further, the transmission 6 and the drive wheel 8 are connected to each other via a drive shaft 16.

  The vehicle 2 further includes a traveling pedal 18 that is operated by the driver of the vehicle 2. According to a possible embodiment of the present invention, a clutch pedal is used as the travel pedal 18 when the vehicle 2 has a transmission 6 that can be manually shifted, and the vehicle 2 can be automatically shifted. When the transmission 6 is provided, an accelerator pedal is used.

  Furthermore, FIG. 1 shows an embodiment of a device 20 according to the invention, which device 20 is here arranged inside the vehicle 2. The device 20 includes a control unit 22, a sensor 24, a first actuator 26, and a second actuator 28 as its components. The first actuator 26 is configured to supply a load to the drive engine 4, and the second actuator 28 is configured to supply a load to the clutch 14.

  Here, it is assumed that the vehicle 2 is operated in the inertia running mode, in which the drive engine 4 is disconnected from the transmission 6. In contrast, the clutch 14 is opened so that no frictional coupling occurs between the drive engine 4 and the transmission 6. Furthermore, in such a repulsive driving mode, it is also assumed that the drive engine 4 is shut off or stopped. The coasting mode described above is also referred to as a coasting mode or a coasting mode.

  Furthermore, in the above-described first embodiment of the method according to the present invention, it is assumed that the operation is started by the operation of the traveling pedal 18 by the driver. After the operation of the travel pedal 18, the speed condition of the vehicle 2 is determined by the sensor 24. The current kinematic parameters of the vehicle 2 are obtained using this speed situation.

  The first kinematic parameter of this kind is the current speed of the vehicle 2. The second kinematic parameter is the velocity gradient and is the local derivative of velocity. By using the speed gradient, it is possible to determine what altitude course the road on which the vehicle 2 is currently traveling has. By detecting the speed gradient, it is determined whether the vehicle 2 is going up an uphill or a slope, whether it is traveling on a straight road or a flat road with no change in altitude, or downhill or down a slope.

  Parameters for the current speed situation are transmitted from the sensor 24 to the control unit 22. Under consideration of the speed situation, i.e. in consideration of speed and speed gradient, after the elapse of the inertial running mode or inertial running period, the control unit 22 for the continuous running of the vehicle 2 driven by the engine Recommended gears are provided. At this time, the control unit 22 automatically determines at which gear stage the engine-driven running is to be continued.

  If the vehicle 2 has the manual transmission 6, the recommended shift speed is visually and / or audibly displayed for the triver. As a result, the driver can clutch the recommended gear position.

  If the vehicle 2 has the automatic transmission 6, the second actuator 28 is driven and controlled by the control unit 22, and the second gear 28 is notified of the recommended shift stage to be provided. As a result, the recommended shift speed is applied by the clutch 14 that is driven and controlled by the second actuator 28.

  In addition to the recommendation of the gear position, the first actuator 26 associated with the drive engine 4 is driven and controlled (this may be a control device for the drive engine 4). In consideration of the recommended speed, the current speed of the drive engine 4 is accelerated to a recommended speed corresponding to the normal speed of the recommended speed.

  By means implemented within the framework of the method according to the invention, it is possible to restart the vehicle 2 without a shock and / or without a braking action after the end of the coasting mode.

  According to the device 20 for operating the vehicle 2 described above, a recommended shift stage or a recommended shift change is provided under the operation of the traveling pedal 8 after the inertial traveling mode or the coasting traveling mode has elapsed, and the drive engine 4 The current rotation speed is accelerated to the recommended rotation speed. This recommended rotational speed corresponds to the recommended gear position under the current speed condition of the vehicle 2.

  FIG. 2 shows a flowchart of a second embodiment of the method according to the invention. In this case, the flowchart is divided into an upper first partial diagram 40 and a lower second partial diagram 42. A horizontal axis corresponding to the time axis 44 is assigned to these two partial diagrams 40 and 42.

  In the upper first partial diagram 40, five further ordinates 46, 48, 50, 52, 54 are assigned. In this case, the rotational speed “nmot_w” of the drive engine per minute is plotted along the first ordinate 46. This rotational speed “nmot_w” is represented by a first curve 56 in the first partial diagram 40. Along the second ordinate 48, the vehicle speed “vfzg_w” is plotted in hourly travel kilometers. This speed is further represented by a second characteristic curve 58 within the first partial diagram 40. Along the third ordinate 50, the percentage value “wped_w” is represented, which represents how much the travel pedal of the vehicle is depressed. The value for this is represented by the third characteristic curve 60 in the first partial diagram 40 of FIG. A value for the gear stage of the vehicle transmission is shown along the fourth ordinate 52. In this regard, in the first partial diagram 40, the fourth characteristic curve 62 indicates the recommended gear stage "gangsolstrt", and the fifth characteristic curve 64 indicates the gear stage "gangi" that is currently input. It is indicated along the fifth ordinate 54 whether the select lever is in the neutral position “Gbx_stNPos”. This is shown in the first partial diagram 40 on the basis of the sixth characteristic curve 66.

  The lower partial diagram 42 shows the seventh characteristic curve 68 "B_brems" -Bit = this indicates the brake pedal position from the top to the bottom, and the eighth characteristic curve 70 "B_kuppt" -Bit = this indicates the clutch position. Ninth characteristic curve 72 "B_II" -Bit = This represents an idling state. In the ninth characteristic curve 72, when the rotational speed is equal to or less than the threshold value, the value 1 is Otherwise, the value 0 is returned. Accordingly, the ninth characteristic curve 72 represents a condition for idling from the viewpoint of the driver. In this case, when the accelerator pedal is not operated, “B_II” −Bit 1 to “TRUE”.

  The tenth characteristic curve 74 "B_stanf" -Bit is formed for the start request, the eleventh characteristic curve 76 "B_stoanf" -Bit is formed for the stop request, and the twelfth characteristic curve 78 "B_send". -Bit is formed for start-up end. When the starting process is completed and the engine speed is equal to or higher than a predetermined threshold value, the “B_send” -Bit returns a value of 1, otherwise returns a value of 0.

  A bi-directional arrow 80 represents a time interval of 10 seconds with respect to the partial diagrams 40 and 42. The diagram segment indicated by the dotted curly braces 82 is for enlarging and detailing the flowchart segment from FIG. 2 in FIG.

  The flowchart of FIG. 3 shows details of the diagram section of FIG. 2 picked up by the braces 82. The upper partial diagram 86 of FIG. 3 shows details of the first partial diagram 40 from the upper side of FIG. 2, and the lower partial diagram 88 of the second partial diagram from the lower side of FIG. 42 details are shown. As a scale representing the scale of FIG. 3, a double arrow 84 represents a time interval of 1 second.

The flow chart of FIGS. 2 and 3 has a rotational speed n_mot = 0 driving engine is first constructed as an internal combustion engine. Subsequently, after starting, the rotational speed is set for the recommended third shift speed. When the speed is 50 km / h or less, the recommended fourth shift speed is set.

  This method is carried out for a predetermined period only after the inertial running mode has elapsed, and is performed under a normal shift process, for example, under acceleration from the normal third shift speed to the fourth shift speed. I will not.

  Within the framework of the invention it is also possible to provide further extended functionality. Thereby, for example, when the gear position is switched to neutral N, the clutch pedal is disengaged, and the vehicle speed is below the threshold of about 100 km / h, a stop request is generated. The start request is generated when a travel pedal configured as a clutch pedal is newly depressed (this corresponds to a case where the clutch pedal is normally depressed to about 10%). The speed change recommendation and the speed increase of the internal combustion engine depending on the speed are performed after the restart from the coasting mode.

  With regard to the latest vehicle transmissions, this type of vehicle transmission is configured to have both an automated part and a manual part, so depending on the driver's preference, between the automated part and the manual part. The reciprocating switching is performed. As a result, the shift stage of this type of vehicle can alternately perform manual shift and automatic shift, and can be operated as an automatic transmission or a manual transmission accordingly. The method is triggered for this type of vehicle by clutch pedal operation or accelerator pedal operation, depending on the type of shift change.

  According to yet another advantageous embodiment, the coasting mode can be terminated not only by depression of the accelerator pedal but also by light depression of the brake pedal (usually occurring under a positive speed gradient). In such a case, the rotational speed of the drive engine may be increased until the rotational speed is synchronized with a desired value.

  For example, in the case of a vehicle equipped with an automatic transmission, this option may be used in the following cases, that is, the vehicle in coasting mode approaches a steep downhill, and the driver avoids the operation of the accelerator pedal and desires engine braking. It can also be applied to other cases.

  In the case of reacting to a sudden red signal when starting near an intersection, it usually depends on the speed of the vehicle.

  In the case of a manual transmission, the clutch is operated by the driver, whereby the drive engine is automatically switched on and the drive train is connected only when the speed is high.

  The shift change when the brake is depressed and the shift change when the drive train is connected can be selected differently from when the accelerator pedal is depressed. This can be done by switching to a lower gear to activate the engine brake.

2 Vehicle 4 Drive Engine 6 Transmission 8 Drive Wheel 10 Engine Shaft 12 Transmission Input Side 14 Clutch 16 Drive Shaft 18 Traveling Pedal 20 Device 22 Control Unit 24 Sensor 26 First Actuator 28 Second Actuator

Claims (11)

A method for operating a vehicle (2), comprising:
An inertia running mode is implemented between the transmission (6) and the drive engine (4),
When the travel pedal (18) is operated after the inertial travel mode,
A recommended shift stage is provided depending on the speed of the vehicle (2) and the speed gradient of the vehicle (2), and the current rotational speed of the drive engine (4) is determined based on the current traveling state of the vehicle (2). The method is characterized in that the vehicle is accelerated to a recommended rotational speed corresponding to the recommended shift speed.   The method of claim 1, wherein the recommended speed is provided first, and then the current speed is accelerated to the recommended speed.   The method according to claim 1 or 2, wherein the speed of the vehicle (2) and / or the speed gradient of the vehicle (2) are used as parameters that take into account the driving situation. If the transmission (6) is a manual transmission, the provision of the recommended gear is triggered by the travel pedal (18) configured as a clutch pedal and the recommended gear is displayed to the driver. The method according to any one of 1 to 3 . If the transmission (6) is an automatic transmission (6), the provision of the recommended shift stage is triggered by the travel pedal (18) configured as an accelerator pedal, and the automatic transmission (6) recommended shift process control drive for shifting to the speed change stage, the method according to any one of claims 1 3. The method according to any one of claims 1 to 5 , wherein the drive engine (4) is stopped during the coasting mode and restarted by setting the rotational speed of the drive engine (4). It said method which is carried, The method of claim 1 to 6 any one for a vehicle comprises a configured drive engine (4) as an internal combustion engine (2). The method according to any one of claims 1 to 7 , wherein the shift speed recommended by the shift speed recommendation is obtained continuously in time during the inertia running mode. A device for operating a vehicle (2),
An inertia running mode is implemented between the transmission (6) and the drive engine (4),
Furthermore, a device (20) is provided, the device (20)
When the travel pedal (18) is operated after the inertial travel mode,
A recommended shift stage is provided based on the speed of the vehicle (2) and the speed gradient of the vehicle (2), and the current rotational speed of the drive engine (4) is determined according to the current running condition of the vehicle (2). And an apparatus configured to accelerate to a recommended rotational speed corresponding to the recommended shift speed. If the transmission (6) is a manual transmission, the provision of the recommended gear is triggered by the travel pedal (18) configured as a clutch pedal and the recommended gear is displayed to the driver. 9. The apparatus according to 9 . If the transmission (6) is an automatic transmission (6), the provision of the recommended shift stage is triggered by the travel pedal (18) configured as an accelerator pedal, and the automatic transmission (6) The apparatus according to claim 9 , wherein the apparatus controls the shift process for shifting to the recommended shift stage.

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