DE102017204008A1 - Operating method for a motor vehicle and motor vehicle - Google Patents

Abstract

An operating method (30) for a motor vehicle (10) comprising an internal combustion engine (11) having a fuel injection device (15), a control unit (19), a manual transmission (12), a shift lever (17), a brake pedal (13) , a clutch (16) and a clutch pedal (14) are provided, during which a deactivation (31) of the fuel injection device (15) is made during a pushing operation, as long as the rotational speed of the internal combustion engine (11) is above a first speed threshold. According to the invention, maintenance (32) of the deactivation (31) of the fuel injection device (15) is operated when it is detected that the clutch pedal (14) is depressed. In addition, a motor vehicle (10) is provided for carrying out the operating method (30).

Description

The present invention relates to an operating method for a motor vehicle according to the preamble of claim 1. In addition, the present invention relates to a motor vehicle which is designed to carry out the operating method.

It is known in the prior art in motor vehicles having an internal combustion engine to deactivate the fuel injection (fuel cut-off) when the motor vehicle is in a coasting operation and the internal combustion engine does not fall below a certain speed. In overrun operation, a frictional connection between the internal combustion engine and the motor vehicle is produced and the motor vehicle tows the internal combustion engine. The deactivation is then terminated, for example, upon actuation of the clutch, whereby the traction is interrupted.

From the DE 202014000919 U1 It is known that many motor vehicles, that is to say drive systems, are provided with a control, usually with an electronic control unit (ECU) which is designed, among other functions, to perform the so-called stop-start function. With this function, the ECU automatically shuts down and restarts the internal combustion engine to reduce the amount of time that the engine spends idling, thereby reducing fuel consumption and emissions. An extended use of the stop-start function is achieved by shutting off the engine before stopping the vehicle when the vehicle speed is lower than a predetermined threshold. This reinforced stop-start function is called the sailing mode, which makes it possible to shut off the engine of a moving vehicle. DE 202014000919 U1 defines the coast down phase as a drive mode of a motor vehicle with no requested torque and with the clutch engaged (closed). As a requested torque, a torque is determined, which is requested by the driver by pressing the accelerator pedal. Sailing mode refers to a drive mode of the motor vehicle without requested torque and with disengaged (disconnected) clutch. Fuel cut-off mode (DFCO) refers to a drive mode of the motor vehicle with no requested torque, with the clutch engaged and with the fuel injection suppressed (deactivated). During the coast down phase of a motor vehicle, therefore, sailing operations occur by disconnecting the powertrain from the engine, with the engine either in idle or in the stop phase. If no coasting occurs during a coastdown phase, an overrun fuel cut occurs with the engine running with the powertrain engaged but with fuel injection suppressed.

The DE 202014000919 U1 relates to a computer program for operating a motor vehicle in sailing mode or in fuel cut-off mode. The computer program comprises a computer code adapted to carry out a method for operating a motor vehicle in either the sailing mode or the coasting shutdown mode, the motor vehicle comprising an internal combustion engine and a drive train. During a deceleration phase of the motor vehicle, the method either activates a sailing mode when a requested torque is lower than a counter torque due to the inertia of the motor vehicle, the road resistance and the grade of the road, and when the requested torque is higher than a friction torque due to the friction resistances of the engine, or activating a fuel cut-off mode when the requested torque is lower than the friction torque.

The DE 102013220517 A1 relates to a method and an arrangement for operating a motor vehicle, which has a clutch to be operated via a clutch pedal and an internal combustion engine for driving. A position of the clutch pedal is detected and it is only in response to the position of the clutch pedal causes a switching of the internal combustion engine.

The DE 102012015291 A1 relates to a motor vehicle with an internal combustion engine, a drive wheel assembly connectable therewith, a clutch for selectively connecting and disconnecting the engine and drive wheel assembly, an actuator for actuating this clutch, and control means for controlling said actuator, said control means comprising comparison means for comparing a desired magnitude and an actual size and an adjusting means which is adapted to close or open the coupling, in particular partially, on the basis of this comparison of desired size and actual size.

The DE 102013217724 A1 relates to a method for operating a multi-cylinder internal combustion engine, wherein one of the cylinders is in a combustion stroke in which a fuel mixture / air mixture is ignited in a combustion chamber of the first cylinder, while another of the cylinders is in a compression stroke in which a Compression of air in the further cylinder takes place, wherein an inlet valve and / or an outlet valve of the cylinder located in the compression stroke are controlled so that they are open during a period of time from the beginning of the compression stroke.

The DE 102010062756 A1 relates to a motor vehicle having an evaluation unit, by means of which a braking request of the driver is already recognizable prior to a brake pedal actuation, and to a control unit, by means of which a command for activating a sailing operation or overrun operation can be output as a function of the driver's braking request.

The present invention has for its object to provide an operating method with which a motor vehicle can be operated to save fuel.

This object is achieved with an operating method according to claim 1 and a motor vehicle according to claim 10. Advantageous developments of the invention are specified in the dependent claims.

In the method of operation of the invention for a motor vehicle having an internal combustion engine having a fuel injection device, a control unit, a manual transmission, a shift lever, a brake pedal, a clutch and a clutch pedal, a deactivation of the fuel injection device is made during a coasting operation, as long as the speed of the internal combustion engine first speed threshold. According to the invention, maintenance of deactivation of the fuel injection device is operated when it is detected that the clutch pedal is depressed. In particular, the deactivation is made on condition that a coolant of the internal combustion engine does not fall below a certain temperature threshold value.

As a result, the time is extended beyond the phase of the overrun operation, in which the internal combustion engine is not unnecessarily supplied with fuel. The operating method according to the invention thus saves fuel and reduces emissions.

In an advantageous embodiment of the operating method according to the invention, the maintenance of deactivation is operated on condition that it is detected that the brake pedal is depressed.

The depressed brake pedal is thus used as an easily determinable indicator of sustained deceleration.

In an advantageous embodiment of the operating method according to the invention a shutdown of the engine is made under the condition that it is recognized during the maintenance of the deactivation that the clutch pedal is below a lower actuation limit position, in particular in its end position.

Deactivation of the internal combustion engine can thus take place before the motor vehicle is at a standstill. The stopping process is made more comfortable for the driver.

In an advantageous embodiment of the operating method according to the invention, a restart of the internal combustion engine is made after the shutdown of the internal combustion engine on the condition that it is detected that the brake pedal is released.

The released brake pedal is used here as an easily determinable indicator of an impending acceleration request.

In an advantageous embodiment of the operating method according to the invention, as an alternative to the restart after the shutdown of the internal combustion engine on the condition that it is detected that the clutch pedal is located above a lower actuation limit position, a maintenance of the shutdown operated.

The shutdown is thus maintained as long as possible.

In an advantageous embodiment of the operating method according to the invention, a restart is made after the maintenance of the shutdown, provided that it is detected that the clutch pedal is again below the lower actuation limit position, in particular that the clutch pedal is again in its end position.

The end position of the clutch pedal is used here as an easily determined indicator that signals the intention of the driver to make a shift to accelerate the vehicle.

In an advantageous embodiment of the operating method according to the invention, a restart is made after the maintenance of the shutdown under the alternative condition that it is detected that the shift lever is moved and a gear is engaged. The inserted gear is in particular a starting gear, such as a first gear or a reverse gear.

Here, the position of the shift lever is used as an easily determined indicator for an intended acceleration process.

The motor vehicle according to the invention has a A fuel injection device having an internal combustion engine, a control unit, a manual transmission, a shift lever, a brake pedal, a clutch and a clutch pedal. The motor vehicle according to the invention is designed to carry out the operating method according to one of the preceding claims.

The motor vehicle can make use of the advantages of the operating method according to the invention.

Further advantages of the present invention will be apparent from the detailed description and the drawings. The invention will be explained in more detail with reference to the drawings and the description below. Show it:

1 an inventive motor vehicle in an exemplary embodiment; and

2 an inventive operating method in an exemplary embodiment.

In the 1 is the motor vehicle according to the invention 10 shown schematically in an exemplary embodiment. The car 10 includes an internal combustion engine 11 with a fuel injection device 15 , a control unit 19 , a manual transmission 12 , a shift lever 17 for switching the gearbox 12 , a brake pedal 13 , a clutch 16 and a clutch pedal 14 for actuating the clutch 16 ,

The fuel injection device 15 is formed, the internal combustion engine 11 To supply fuel. The fuel injection device 15 is an electronic injector and is from the control unit 19 controllable.

The internal combustion engine 11 In particular, has a liquid cooling, which is formed, the internal combustion engine 11 to extract heat by means of a coolant.

The gear 12 is in the usual way via the means of the clutch pedal 14 to be operated clutch 16 with the internal combustion engine 11 in active connection. Is the clutch pedal 14 in a rest position, so it is not actuated, then is through the clutch 16 a frictional connection between internal combustion engine 11 and gear 12 produced. When the clutch pedal is pressed 14 disconnects the clutch 16 this adhesion.

The gear 12 has several courses, in the usual way depending on the position of the motor vehicle 10 arranged shift lever 17 are inserted. A first gear is as a starting gear in the forward direction and a reverse gear is designed as a starting gear in the reverse direction. Next to it, the gearbox 12 further forward gears on.

Next to the clutch pedal 14 and the brake pedal 13 includes the motor vehicle 10 an accelerator pedal 18 for influencing the power output of the internal combustion engine 11 , The pedals 13 . 14 . 18 are in the usual way in the motor vehicle 10 arranged and each include a sensor for detecting the pedal position. The pedals are inactive 13 . 14 . 18 in each case a rest position.

The controls, brake pedal 13 , Clutch pedal 14 , Accelerator pedal 18 and shifter 17 are as well as the fuel injection device 15 and the internal combustion engine 11 data transmitting with the control unit 19 connected.

In the 2 is the operating method according to the invention 30 shown schematically in an exemplary embodiment. The motor vehicle according to the invention 10 is trained, the operating procedure 30 perform.

In the operating procedure 30 becomes a deactivation 31 the fuel injection device 15 , also known as overrun cutoff, overrun cutoff mode or DFCO, during a coasting operation of the motor vehicle 10 performed. In overrun mode, the motor vehicle 10 a speed greater than zero on and between the internal combustion engine 11 and the motor vehicle 10 is a traction made, so that the motor vehicle 10 the internal combustion engine 11 drags. In the deactivated state, ie during deactivation 31 , supplies the fuel injection device 15 the internal combustion engine 11 not with fuel. The deactivation 31 is made on condition that the internal combustion engine 11 has a minimum speed, ie the speed is above a lower speed threshold. Another requirement may be that the coolant of the internal combustion engine 11 does not fall below a certain temperature threshold, ie has a minimum temperature.

According to the invention, a maintenance 32 deactivation 31 exercised when it is determined that the clutch pedal 14 is pressed. This is the clutch pedal 14 not in its rest position but in an operating position. Any position other than the rest position is an operating position. In particular, the clutch pedal is located 14 between an upper actuation limit position and a lower actuation limit position. The upper actuation limit position is below the rest position and the lower actuation limit position is above an end position of the clutch pedal 14 and below the upper actuation limit position. In the rest position is the clutch pedal 14 accordingly unconfirmed, it is in a usual installation situation in the highest possible position. In the end position is the clutch pedal 14 completely pressed / kicked, it is in the usual installation position in the lowest possible position. The term below therefore means in the sense of this document in the direction of the end position. The term above therefore means in the sense of this document in the direction of rest.

A prerequisite for the exercise of maintenance 32 is in particular the position of the brake pedal 13 so that the maintenance 32 is only exercised when the brake pedal 13 is pressed, so it is not in its rest position. Another requirement for the exercise of maintenance 32 is in particular the speed of the internal combustion engine 11 which should not only be above the lower speed threshold, but should also be below an upper speed threshold. The speed of the internal combustion engine 11 lies in a predefined speed setpoint range.

After the maintenance 32 deactivation 31 is in the operating procedure 30 in particular a first examination 33 carried out. In the first exam 33 Several prerequisites are checked. It checks if the speed of the internal combustion engine 11 remains above the lower speed threshold and whether at the same time the brake pedal 13 continues to be pressed and whether at the same time the clutch pedal 14 is located below the lower actuation limit position, in particular in its end position.

Returns the first exam 33 that not all prerequisites are fulfilled becomes an activation 34 the fuel injection device 15 executed and the internal combustion engine 11 is operated normally. The internal combustion engine 11 is then again supplied with fuel, since it can be assumed that the driver has the intention of the motor vehicle 10 now to accelerate again.

Returns the first exam 33 that all prerequisites are fulfilled, the maintenance remains 32 deactivation 31 unchanged and a shutdown 35 of the internal combustion engine 11 , also called engine stop or stop-phase, is brought about.

After the shutdown 35 is in the operating procedure 30 in particular a second test 36 carried out. In the second exam 36 Two prerequisites are checked. It will check if the clutch pedal 14 continues to be below the lower actuation limit position, in particular in the end position, and whether at the same time the brake pedal 13 is solved.

Returns the second exam 36 that both conditions are not met will be a reboot 37 of the internal combustion engine 11 performed since it can be assumed that the driver has the intention of the motor vehicle 10 now to accelerate again.

Returns the second exam 36 that both conditions are fulfilled, in particular a third test 38 in which it is checked whether the position of the clutch pedal 14 changed by checking if the clutch pedal 14 now located in a position above the lower actuation limit position.

Is the clutch pedal 14 not above the lower actuation limit position is again the second test 36 carried out.

Returns the third exam 38 that is the clutch pedal 14 is above the lower actuation limit position, so that the clutch pedal 14 is moved in the direction of rest, is a maintenance 39 the shutdown 35 operated, since it can be assumed that the driver of the motor vehicle 10 initially does not intend the motor vehicle 10 to accelerate.

After the maintenance 39 the shutdown 35 in particular, a fourth exam 40 carried out, in which is checked whether the clutch pedal 14 was moved back towards the end position and the clutch pedal 14 now again below the lower actuation limit position, in particular again in its end position.

Is the clutch pedal 14 not below the lower actuation limit position, in particular not in its end position, will continue to maintain 39 the shutdown 35 operated, since it can be assumed that the driver of the motor vehicle 10 initially does not intend the motor vehicle 10 to accelerate.

Is the clutch pedal 14 below the lower actuation limit position, in particular in its end position, the restart is 37 of the internal combustion engine 11 made since it can be assumed that the driver has the intention of the motor vehicle 10 now to accelerate again.

After the shutdown 35 of the internal combustion engine 11 can additionally the shift lever 17 be monitored to see whether a gear, in particular a starting gear has been inserted. Recognition of an engaged gear may be after maintenance 39 the shutdown 35 the prerequisite for the restart 37 of the internal combustion engine 11 because it can be presumed that the driver has the intention of the motor vehicle 10 now to accelerate again.

LIST OF REFERENCE NUMBERS

10

 motor vehicle

11

 internal combustion engine

12

 transmission

13

 brake pedal

14

 clutch pedal

15

 Fuel injection device

16

 clutch

17

 gear lever

18

 accelerator

19

 control unit

30

 operating procedures

31

 deactivation

32

 Maintaining deactivation

33

 First test

34

 activation

35

 shutdown

36

 Second exam

37

 restart

38

 Third exam

39

 Maintaining the shutdown

40

 Fourth exam

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 202014000919 U1 [0003, 0003, 0004]
• DE 102013220517 A1 [0005]
• DE 102012015291 A1 [0006]
• DE 102013217724 A1 [0007]
• DE 102010062756 A1 [0008]

Claims (10)

Operating procedure ( 30 ) for a motor vehicle ( 10 ) with a fuel injection device ( 15 ) having internal combustion engine ( 11 ), a control unit ( 19 ), a manual transmission ( 12 ), a shift lever ( 17 ), a brake pedal ( 13 ), a coupling ( 16 ) and a clutch pedal ( 14 ), during which a deactivation ( 31 ) of the fuel injection device ( 15 ) is carried out as long as the speed of the internal combustion engine ( 11 ) is above a first speed threshold, characterized in that a maintenance ( 32 ) deactivation ( 31 ) of the fuel injection device ( 15 ) is detected when it is detected that the clutch pedal ( 14 ) is pressed. Operating procedure ( 30 ) according to claim 1, wherein the deactivation ( 31 ) is carried out under the condition that a coolant of the internal combustion engine ( 11 ) does not fall below a certain temperature threshold. Operating procedure ( 30 ) according to claim 1 or 2, wherein the maintenance ( 32 ) deactivation ( 31 ) is operated on the condition that it is detected that the brake pedal ( 13 ) is pressed. Operating procedure ( 30 ) according to claim 3, wherein a shutdown ( 35 ) of the internal combustion engine ( 11 ) provided that during maintenance ( 32 ) deactivation ( 31 ) is detected, that the clutch pedal ( 14 ) is located below a lower actuation limit position. Operating procedure ( 30 ) according to claim 4, wherein after the shutdown ( 35 ) of the internal combustion engine ( 11 ) provided that it is recognized that the brake pedal ( 13 ), a reboot ( 37 ) of the internal combustion engine ( 11 ) is made. Operating procedure ( 30 ) according to claim 4, wherein after the shutdown ( 35 ) of the internal combustion engine ( 11 ) provided that it is recognized that the clutch pedal ( 14 ) is located above a lower actuation limit position, a maintenance ( 39 ) the shutdown ( 35 ) is operated. Operating procedure ( 30 ) according to claim 6, wherein after the maintenance ( 39 ) the shutdown ( 35 ) a restart ( 37 ) is carried out on the condition that it is recognized that the clutch pedal ( 14 ) is again below the lower actuation limit position. Operating procedure ( 30 ) according to claim 6, wherein after the maintenance ( 39 ) the shutdown ( 35 ) a restart ( 37 ) is carried out on the condition that it is recognized that the shift lever ( 17 ) is moved and a gear is engaged. Operating procedure ( 30 ) according to claim 7, wherein the engaged gear is a starting gear. Motor vehicle ( 10 ) with a fuel injection device ( 15 ) having internal combustion engine ( 11 ), a control unit ( 19 ), a manual transmission ( 12 ), a shift lever ( 17 ), a brake pedal ( 13 ), a coupling ( 16 ) and a clutch pedal ( 14 ), wherein the motor vehicle ( 10 ), the operating method ( 30 ) according to one of the preceding claims.

Images