DE102006053515A1 - Motor vehicle with a start-stop function for an internal combustion engine and operating method therefor - Google Patents

Abstract

The present invention relates to a method for operating a motor vehicle with an internal combustion engine (1), a manually shiftable manual transmission (6) and a clutch (3) with which the internal combustion engine (1) with the manual transmission (6) is connectable, wherein a control device (22) in the presence of a stop condition causes an automatic shutdown of the internal combustion engine (1) in a stop operation and causes an automatic restart of the internal combustion engine (1) in the presence of a start condition. In addition to a usual automatic restart of the internal combustion engine (1) to continue the drive of the motor vehicle, a restart is provided when the state of charge of one of the internal combustion engine (1) rechargeable energy storage device (19) during the stop operation falls below a minimum value. In order to prevent a re-start when the drive gear and clutch (3) is engaged, which could cause a safety-critical driving condition, it is suggested on the one hand to request the driver via a signal to open the clutch or to shift the transmission into neutral position. Alternatively, a shift prevention device (25) is proposed which prevents shifting of the transmission (3) from the neutral position to a running gear position during the stop operation of the internal combustion engine (1).

Description

The The present invention relates to a motor vehicle and a method for its operation, the motor vehicle having an internal combustion engine, a manual transmission and a clutch, through which the Combustion engine is connectable to the manual transmission, the Motor vehicle between a normal operating condition with running internal combustion engine and a standby state with the internal combustion engine switched off is switchable, wherein in the standby state, the presence one or more turn-on conditions of a set of turn-on conditions is checked and if there is at least one turn-on condition of the set the motor vehicle by restarting the engine returned to the normal operating state becomes.

By doing the internal combustion engine in the presence of certain conditions, if no drive of the vehicle is required, usually in case of delay or standstill If the vehicle is switched off, fuel consumption can be reduced become.

If the driver expects a longer standstill of the vehicle, for example in front of a railroad crossing with a closed railway barrier or in front of a construction site traffic light, the driver usually switches the transmission to neutral position and then releases the clutch pedal, ie closes the clutch. The non-operation of the clutch pedal when the vehicle is at a standstill in the DE 10 2004 024 213 A1 referred to in paragraph 7 considered as shutdown condition, at the entrance of the internal combustion engine is switched off. A restart of the internal combustion engine takes place when the clutch is opened, without the brake pedal is actuated, since this is interpreted as a signal that the driver wants to continue his journey.

is the motor vehicle over longer time or heaped in standby mode, there is a risk that one of the internal combustion engine battery to be charged by voltage applied to the battery electrical Consumers is discharged so heavily that the remaining capacity is not more sufficient to return the engine to normal operation to start again.

In the DE 199 11 736 A1 is proposed when the motor vehicle is in the standby state and the remaining capacity of the battery is below a predetermined value to start the engine automatically before the battery expires in a state in which the engine can not be started.

switches the driver in the standby state, however, the transmission accidentally in a drive without the clutch to open, there is a restart the danger that the vehicle will roll up unexpectedly. Especially when the re-start not consciously by the driver, but by a Automatically initiated, a safety-critical situation may arise.

In the DE 199 11 736 A1 the danger is more likely to be seen in the overload of the starter motor when starting the engine when the drive gear and clutch engaged. It is therefore proposed to allow starting of the internal combustion engine at standstill of the vehicle falls below a predetermined minimum charge value of the battery only when the transmission is in neutral position. In the event that the vehicle is stationary, the internal combustion engine is switched off, a minimum charging value of the battery is exceeded and the transmission is in a Fahrgangsstellung, provides the DE 199 11 736 A1 no solution.

The It is therefore an object of the present invention to provide an operating method for a To provide motor vehicle and a motor vehicle, in which the safety-critical situation described above can be avoided can and is ensured that the vehicle is not for the driver unexpectedly in standby mode.

The Task is solved with a method according to one of claims 1 and 4 and a motor vehicle according to one of the claims 8 and 9.

• – das Vorliegen einer oder mehrerer Anschaltbedingungen eines Satzes von Anschaltbedingungen überwacht wird, und
• – bei Vorliegen wenigstens einer Anschaltbedingung des Satzes das Kraftfahrzeug durch Wiederanschalten des Verbrennungsmotors (1) in den Normalbetriebszustand zurückversetzt wird.

In the context of the present invention, two methods are provided for achieving the above object. These are in each case a method for operating a motor vehicle having an internal combustion engine, a manual transmission and a clutch, by which the internal combustion engine can be connected to the manual transmission, wherein the motor vehicle is switchable between a normal operating state with the internal combustion engine running and a standby state with the internal combustion engine switched off,
when in the standby state

• The presence of one or more turn-on conditions of a set of turn-on conditions is monitored, and
• In the presence of at least one turn-on condition of the set, the motor vehicle by reactivation of the internal combustion engine ( 1 ) is returned to the normal operating state.

In the method according to claim 1, in the standby state, it is further detected whether there is an exclusion condition that simultaneously the clutch is closed and a gear is engaged in the manual transmission, and the return to the normal operation state is inhibited as long as the exclusion condition exists. In order to avoid, that the driver is surprised, when the exclusion condition occurs, a signal perceptible by a driver of the vehicle is generated, so that the driver can cancel the exclusion condition in good time by opening the clutch or shifting to a neutral position.

Complementary to surveillance the turn-on condition in the standby state preferably takes place in normal operating mode the monitoring a shutdown condition to automatically occur when they occur to switch to the standby state.

A Minimum requirement for the presence of the shutdown condition may be that the transmission in neutral position.

at The method according to claim 4 is further in the normal operating state the presence of a shutdown condition is monitored and present the shutdown condition the motor vehicle in the standby state the shutdown condition includes the request that the transmission is in neutral position, and the insert a corridor is locked while the motor vehicle is in the standby state. In this way is the occurrence of the exclusion condition of prevented in the first place.

at the latter method, the shutdown condition may further the request include that the clutch is closed.

The Shutdown condition conveniently includes in both methods the requirement that the vehicle is at a standstill.

It There may be several connection conditions, one of which can be met must to cause the change to the normal operating state. A first turn-on condition may include as a minimum requirement that the clutch is open is.

This opens the Driver usually, to engage a drive to continue driving the vehicle. The opening The clutch is thus understood as a signal that the driver is driving would like to continue. Optionally, the first start condition may include other requirements, for example, that a gear is engaged in the transmission, and / or that actuates an accelerator pedal is.

A second connection condition is expediently that the state of charge one of the internal combustion engine rechargeable energy storage a Minimum value falls below. This minimum value must be the energy requirement cover a starter needs to start the internal combustion engine.

to solution The object of the present invention are furthermore motor vehicles provided, each preferably for carrying out a the operating methods described above are configured.

The motor vehicles have an internal combustion engine, a manual transmission, a clutch, by which the internal combustion engine is connectable to the manual transmission, and a control device for switching the motor vehicle between a normal operating state with the engine running and a standby state with the internal combustion engine off, in the presence of a shutdown condition an automatic Disconnection of the internal combustion engine causes a stop operation and causes an automatic restart of the internal combustion engine in the presence of a start condition. The control means is arranged to monitor, in the standby state, the presence of one or more turn-on conditions of a set of turn-on conditions, to detect whether there is an exclusion condition that the clutch is simultaneously closed and a gear is engaged in the manual transmission, and if at least one turn-on condition is present of the sentence and absence of the exclusion condition, the motor vehicle by restarting the internal combustion engine ( 1 ) to return to the normal operating state.

Of Further, in one of these motor vehicles, a signaling device provided for generating a perceivable by a driver Signal when the exclusion condition occurs in the standby state is connected to the control device.

In the other motor vehicle, the control device is set up to monitor the presence of a switch-off condition in the normal operating state and to put the motor vehicle in the standby state when the switch-off condition is present, the switch-off condition comprising the request that the transmission ( 6 ) is in neutral position, and a shift prevention device ( 25 ) is provided to engage a gear in the transmission ( 6 ) during standby.

Preferably have the first and the second motor vehicle with the control device in Connecting neutral position sensor, which detects whether the transmission is in neutral position or not, with the neutral position sensor in the transmission, on the shift lever or on a shift lever mechanism connecting the shift lever and the transmission is arranged.

Preferably the control device forms at least part of an engine control unit of the motor vehicle. However, the controller may be one of the Engine control unit independent control device act.

Further Features and advantages of the invention will become apparent from the following Description of exemplary embodiments with reference to the attached Characters. Show it:

1 a schematic representation of the drive unit of a first embodiment of a motor vehicle according to the present invention;

2 to 4 Flowcharts illustrating an operating method for a motor vehicle with the in 1 shown drive unit;

5 a schematic representation of the drive unit of a second embodiment of a motor vehicle;

6 to 8th Flowcharts illustrating an operating method for a motor vehicle with the in 5 shown drive unit.

1 shows a schematic representation of a drive unit of a motor vehicle not shown. The drive unit includes an internal combustion engine 1 , its crankshaft 2 via a clutch 3 with a transmission input shaft 4 a manual transmission 6 is connectable. A transmission output shaft 7 is about a powertrain 8th with wheels 9 connected the motor vehicle. The opening and closing of the clutch 3 is done with a driver-operated clutch pedal 11 , About a shift lever 13 the driver selects a drive or the neutral position (idle) of the transmission 6 at. A driving gear can be a forward gear or a reverse gear.

The drive unit of the motor vehicle also has a clutch sensor 14 on, closing and opening the clutch 3 detected. The coupling sensor 14 can be configured as a switch. A neutral position sensor 16 who works in the field 6 or in one of the shifters 13 and the gearbox 6 connecting, not shown shift lever mechanism is arranged, detects whether the transmission 6 is in neutral position or switched into a drive. The neutral position sensor 16 can also be designed as a switch. A motion sensor 18 on the drive train 8th determines whether the vehicle is moving or at a standstill.

The motor vehicle further comprises an energy store 19 for electrical energy. This energy storage, usually a standard 12V automotive battery is by means of a generator 5 on the combustion engine 1 rechargeable.

Via an optical and / or acoustic signaling device 20 For example, on an instrument panel in the vehicle cabin, the driver may be asked to the transmission 6 by means of the shift lever 13 in neutral position.

The internal combustion engine 1 , the clutch sensor 14 , the neutral position sensor 16 , the motion sensor 18 , the battery 19 and the signaling device 20 stand with a control device 22 in connection. The controller may be implemented by a conventionally existing engine controller 22 is programmed to perform the tasks of the controller described below in addition to its conventional functions. The control device 22 controls the with respect to the 2 to 4 operations described below.

2 shows a possible shutdown routine for switching off the in 1 shown internal combustion engine 1 when a predetermined shutdown condition involving multiple requests is met. The shutdown of the internal combustion engine 1 is used to save fuel when a drive of the vehicle is not required by the engine, for example, when the vehicle is stationary.

According to 2 is first checked in step S1, if the internal combustion engine 1 is turned on. If this question is answered in the affirmative, a check is made in step S2 as to whether the vehicle is at a standstill, ie whether the vehicle speed is zero. The query is made by the controller 22 to the motion sensor 18 in the drive train 8th , If the question is answered in the affirmative, the clutch sensor is activated in step S3 14 queried if the clutch 3 is closed, or whether the clutch pedal 11 is released. If the question is answered in the affirmative, it is checked in step S4 whether the transmission is in neutral position. This is done by request to the neutral position sensor 16 , If this question is also answered in the affirmative, the control device effects 22 in step S5, a shutdown of the internal combustion engine 1 and a transition to a standby state. The shutdown of the engine takes place for example by switching off a fuel pump, not shown.

If one of the questions in steps S2 and S3 is answered in the negative, the query returns to step S1 and the internal combustion engine 1 stays on.

In the 2 Shutdown routine shown only shows an example of possible shutdown condition requirements. However, a shutdown can also be done if other than the above requirements, as described for example in the DE 10 2004 024 212 A1 or DE 10 2004 024 213 A1 are described are met.

Is in 2 in step S1 found that the internal combustion engine 1 is already in the standby state, so goes the controller 22 to the in 3 shown restart routine over.

In step S11 is via the clutch sensor 14 Check if the clutch 3 is open, ie whether the clutch pedal 11 has passed through. If this question is answered in the affirmative, the internal combustion engine becomes 1 restarted in step S14. The restart takes place, for example, by switching the fuel pump back on and pressing an in 1 illustrated starter 10 that is connected to the battery 19 is present and its need for electrical energy exclusively from the battery 19 is covered.

In addition to the query in step S11, the restart condition may be for restarting the engine 1 include a further request, which is checked in the illustrated in broken lines step S12, namely, whether a drive is engaged, which is about the neutral position sensor 16 can be determined.

If the query S11 and possibly the query S12 answered NO, the controller returns 22 to step S1 back, and the internal combustion engine 1 remains switched off.

In the 3 shown restart routine shows only an example of possible requirements for a power-on condition. However, a restart of the internal combustion engine can also take place if other than the above requirements are met, such as in the DE 10 2004 024 212 A1 or DE 10 2004 024 213 A1 described.

4 shows another restart routine coincident with the in 3 shown, ie, if the question is answered in step S1 with no, ie if the internal combustion engine 1 already switched off and is in standby mode.

In step S41, it is first checked whether the driver is in the standby state with the shift lever 13 a driving gear, for example, the reverse gear or one of the forward gears has turned on. For this purpose, the controller makes 22 a request to the neutral position sensor 16 , If the question is answered in the affirmative, ie a driving gear is engaged, a request is made to the clutch sensor in step S42 14 whether the clutch 3 is open, ie whether the clutch pedal 11 has passed through. If this question is answered in the affirmative, the internal combustion engine becomes 1 Restarted in step S43. The step S43 thus corresponds to step S14. The passage of the clutch pedal 11 and the insertion of a driving gear are thus interpreted as signals that the driver wants to continue his journey with the motor vehicle.

If the question is answered in the negative in step S42, ie, the driver lays down without passing the clutch pedal 11 ie without opening the clutch 3 , a drive, so he is on the signaling device 20 requested by means of an optical and / or acoustic signal, the transmission by means of the shift lever 13 in neutral position.

In step S45, the neutral position sensor is performed 16 the request, whether the gearbox 6 is in neutral position, ie whether the driver is the transmission 6 brought to neutral in the signal. If this is the case, ie if this question is answered in the affirmative, then in step S46 it is checked whether the charge state of the battery 19 has fallen below a minimum value. If this is the case, then the internal combustion engine 1 automatically restarted in step S47. If the minimum value does not fall below, the query returns to step S41. An automatic restart will not be performed.

If the question is answered in the negative in step S45, ie is the transmission 6 switched to a drive, the query returns to step S42.

With the automatic restart in step S47, it is ensured that the battery 19 always has a sufficiently high state of charge, so that, for example, the internal combustion engine 1 can be restarted at all or on the battery 19 adjacent consumers, such as an air conditioner, not shown, or on a 6V socket, such as a cigarette lighter, fitting external cooling device can be sufficiently supplied with electrical energy even when the vehicle is stationary.

Steps S41, S42, S44 and S45 ensure that an automatic restart due to the state of charge of the battery only occurs when either the clutch pedal 11 has passed or the transmission 6 is in neutral position. Would namely an automatic restart with the drive gear engaged and released clutch pedal 11 ie closed clutch 3 take place, this could cause the vehicle to roll on and bring about a safety-critical driving state of the vehicle.

If the driver has not engaged during the standby state, ie if the question is answered in the negative in step S41, the query immediately proceeds to step S46. A critical driving condition is not expected in an automatic restart of the vehicle, as the transmission 6 in neutral position.

The operating method according to the invention thus comprises a safety procedure, which proceeds as follows: as soon as the driver switches the transmission into a driving gear in the standby state without passing through the clutch, he is informed of a signal from the signaling device 20 prompted the transmission 3 in neutral position. A later required by an insufficient state of charge restart of the engine 1 can then be carried out safely.

If the driver is in standby mode without engaging the clutch pedal when engaging a driving gear 11 the signal of the signaling device 20 not only can he respond by laying out the gear, but also by depressing the clutch pedal 11 react. This would be according to the above description for the restart of the engine 1 to lead. Alternatively, the restart can also be linked to the fulfillment of a further requirement, such as the actuation of an unillustrated accelerator pedal.

5 shows a drive unit of a second embodiment of a motor vehicle. Unlike the vehicle of 1 this has a switching prevention device 25 on, which, when activated, a shift of the transmission 6 prevented from the neutral position in a driving position. A signaling device 20 as in the embodiment of 1 is not available here. The shift prevention device 25 can be in gear 6 yourself or at the shifter 13 with the gearbox 6 be arranged connecting shift lever mechanism. The shift prevention device 25 and the controller 22 communicate with each other.

6 shows a shutdown routine compared to 2 an additional step S6. In this step S6, the controller controls 22 the shift prevention device 25 and activates them so that the driver gets the transmission 6 can no longer switch to a drive in stop mode. The transmission thus remains in the neutral position, in which the driver the transmission 3 at standstill of the vehicle and before releasing the clutch pedal 11 ie before closing the clutch 3 has brought.

7 shows a restart routine compared to the restart routine of 3 an additional step S13, in which the control device 22 the shift prevention device 25 controls and deactivates after the driver the clutch pedal 11 has continued to drive, so the clutch 3 has opened, that is, the query is answered in step S11 with Yes. With the deactivation of the switching prevention device 25 the driver can do the transmission 6 switch back to a drive to continue driving.

8th shows a restart routine for the internal combustion engine 1 if the internal combustion engine is to be automatically restarted due to a minimum charge state value of the battery during stop operation.

Is in step S1 of 6 found that the internal combustion engine 1 is switched off, that is already in the standby state, the query goes to step S21 of 8th continue, whether the state of charge of the battery 19 has fallen below a minimum value. If this question is answered in the affirmative, the internal combustion engine will be in step S22 1 automatically rebooted to recharge the battery. A demand as in the restart routine of 4 after the position of the coupling 3 or the transmission 6 is not necessary here, as switching the gearbox 6 in a drive during the standby state by the shift prevention device 25 is generally prevented. A critical driving condition during an automatic restart of the internal combustion engine 1 is prevented in this way.

The in the 2 . 6 Shutdown routines shown may include another (not shown) query, namely whether the state of charge of the battery 19 is equal to or greater than a further, second minimum value, which is preferably selected to be greater than the first in the turn-on of 4 and 8th described minimum value. With this query, the transition to the standby state is prevented from the outset, if the state of charge of the battery so. low is that an automatic restart of the engine after a short shutdown would be necessary.

1

internal combustion engine

2

crankshaft

3

clutch

4

Transmission input shaft

5

Generator / alternator

6

transmission

7

Transmission output shaft

8th

powertrain

9

wheel

10

Starter

11

clutch pedal

13

gear lever

14

clutch sensor

16

Neutral position sensor

18

motion sensor

19

battery

20

Signal generating device

22

control device

25

Switching prevention means

27

Signal generating device

Claims (12)

Method for operating a motor vehicle with an internal combustion engine ( 1 ), a manual transmission ( 6 ) and a clutch ( 3 ), by which the combustion engine ( 1 ) with the manual transmission ( 6 ) is connectable, wherein the motor vehicle between a normal operating state with running internal combustion engine ( 1 ) and a standby state with the internal combustion engine switched off ( 1 ) is detected, in which in the standby state - the presence of one or more turn-on conditions of a set of startup conditions is monitored, - it is detected whether an exclusion condition is present, according to which the clutch is closed and a gear is engaged in the manual transmission, and - at Presenting at least one turn-on condition of the set and absence of the exclusion condition, the motor vehicle by restarting the internal combustion engine ( 1 ) is returned to the normal operating state, characterized in that in the standby state further - upon the occurrence of the exclusion condition, a perceptible by a driver of the vehicle signal is generated. Method according to claim 1, characterized in that in the normal operating state, monitoring the presence of a switch-off condition is and in the presence of the shutdown condition, the motor vehicle in the standby state is set. A method according to claim 2, characterized in that the shutdown condition comprises the request that the transmission ( 6 ) is in neutral position. Method for operating a motor vehicle with an internal combustion engine ( 1 ), a manual transmission ( 6 ) and a clutch ( 3 ), by which the combustion engine ( 1 ) with the manual transmission ( 6 ) is connectable, wherein the motor vehicle between a normal operating state with running internal combustion engine ( 1 ) and a standby state with the internal combustion engine switched off ( 1 ) is monitored, in which in the normal operating state - the presence of a shutdown condition is monitored and - in the presence of the shutdown condition, the motor vehicle is placed in the standby state, and in the standby state - the presence of one or more turn-on conditions of a set of turn-on conditions is monitored and - at If at least one turn-on condition of the set is present in the motor vehicle by reactivation of the internal combustion engine ( 1 ) is returned to the normal operating condition, characterized in that the shut-off condition comprises the request that the transmission ( 6 ) is in the neutral position, and that the engagement of a gear is locked while the motor vehicle is in the standby state. A method according to claim 4, characterized in that the shutdown condition comprises the request that the clutch ( 3 ) closed is. Method according to one of the preceding claims, characterized characterized in that the shutdown condition comprises the request that the vehicle is at a standstill. Method according to one of the preceding claims, characterized in that the turn-on condition is present when the charge state of a rechargeable by the internal combustion engine ble energy storage ( 19 ) falls below a minimum value. Method according to one of the preceding claims, characterized in that the connection condition is present when the clutch ( 3 ) is open. Motor vehicle, in particular for carrying out the method according to one of claims 1 to 3 or one of claims 5 to 8, as far as dependent on claim 1, with an internal combustion engine ( 1 ), a manual transmission ( 6 ), a clutch through which the internal combustion engine ( 1 ) with the manual transmission ( 6 ) and a control device ( 22 ) for switching the motor vehicle between a normal operating state with the internal combustion engine running ( 1 ) and a standby state with the internal combustion engine switched off ( 1 ), which is arranged to monitor in the standby state - the presence of one or more turn-on conditions of a set of turn-on conditions, - to detect whether there is an exclusion condition according to which the coupling is simultaneously closed and a gear is engaged in the manual transmission, and - in the presence of at least one connection condition of the set and absence of the exclusion condition, the motor vehicle by reactivation of the internal combustion engine ( 1 ) to return to the normal operating state, characterized by a signaling device ( 20 . 27 ) for generating a signal perceivable by a driver when the exclusion condition in the standby condition occurs with the control device ( 22 ) connected is. Motor vehicle, in particular for carrying out the method according to claim 4 or one of claims 5 to 8, as far as dependent on claim 4, with an internal combustion engine ( 1 ), a manual transmission ( 6 ), a clutch through which the internal combustion engine ( 1 ) with the manual transmission ( 6 ) and a control device ( 22 ) for switching the motor vehicle between a normal operating state with the internal combustion engine running ( 1 ) and a standby state with the internal combustion engine switched off ( 1 ) configured to monitor the presence of a shut-off condition in the normal operating condition and to put the vehicle in the standby state in the presence of the shut-off condition and to monitor the presence of one or more turn-on conditions of a set of turn-on conditions and in the presence of at least one turn-on condition of the sentence the motor vehicle by reactivation of the internal combustion engine ( 1 ) in the normal operating condition, characterized in that the shut-off condition includes the request that the transmission ( 6 ) is in neutral position, and that a shift prevention device ( 25 ) for preventing the engagement of a gear in the transmission ( 6 ) is provided during the standby state. Motor vehicle according to one of claims 8 to 10, characterized in that a with the control device ( 22 ) associated neutral position sensor ( 16 ), which detects whether the transmission ( 6 ) is in neutral position or not, in the transmission ( 6 ), on a shift lever ( 13 ) or on one of the shifter ( 13 ) and the transmission ( 6 ) connecting shift lever mechanism is arranged. Motor vehicle according to one of claims 8 to 11, characterized in that the control device ( 22 ) is integrated in an engine control unit.