DE19729354B4 - motor vehicle - Google Patents

Abstract

Motor vehicle (99) with a drive unit (1), with an automated torque transmission system (2) and an automated transmission (3), with a device (98) for controlling the automated torque transmission system (2) and the automated transmission (3) with a control unit (7) and at least one actuator (8) controllable by the control unit (7) for actuating the torque transmission system (2) and for switching a transmission ratio of the transmission (3), the control unit (7) is connected to at least one sensor and possibly other electronic units and an engine starting device in signal connection (15), with a gear selection element which determines and / or detects the gearbox position and / or the gearbox program selected, characterized in that when the gearbox (3) is in a parking position (P) or driving gear when attempting to start the drive unit (1) a start release of the drive unit (1) from the control unit unit (7) takes place at the start of the drive unit (2) and the torque transmission system (2) is automatically disengaged and / or a neutral position of the transmission (3) is automatically engaged when a vehicle standstill device is or is being operated.

Description

The invention relates to a motor vehicle having a drive unit, such as a motor, with an automated torque transmission system and an automated transmission, with a device for controlling the automated torque transmission system and the automated transmission with a control unit and at least one controllable by the control unit actuator for actuating the torque transmission system and Shifting a gear ratio of the transmission, the control unit communicates with at least one sensor and optionally with other electronic units, such as with an engine electronics and / or an engine starting device in signal connection, with a gear selector element which determines the engaged gear position and / or the inserted gear program and / / or detected.

A motor vehicle with an automated transmission that can not be switched under load, for example, by the DE 196 37 001 A1 known. In the DE 196 37 001 A1 a hydraulic actuator for automated operation of torque transmission system and transmission is disclosed. Furthermore, a torque transmission system and a transmission, for example, also be actuated by an electric motor or in another way.

The DE 42 18 708 C1 shows an automatic transmission, in which in the selector lever positions except the selector lever positions P and N no start release for the drive unit is issued, to fuse from faulty lines an ignition controller directly to the gearbox control unit and the ignition switch is connected directly to the starter relay.

The WO 94/15808 A1 discloses an automated manual transmission with override of a starter enable to start the drive unit in emergency situations.

In the DE 692 14 556 T2 During a starting operation of the drive unit, the voltage supply of a microcontroller is checked.

In such vehicles sometimes safety-critical situations may occur when the driver side of the engine of the vehicle, such as internal combustion engine, for example, when a gear engaged in the gear or a realized, as inserted, parking brake by an engine start attempt by the engine start device is started or started. For example, in a start attempt under these conditions, the vehicle may be inadvertently moved forward or backward with a jerk.

The critical situations can occur depending on the current transmission position or the transmission program, wherein a current transmission position and / or a current transmission program can be selected for example with a transmission selection element or automatically inserted via a program or a map.

The object of the invention is to provide a motor vehicle mentioned above, which allows a safety-critical and at the same time comfortable operation. Furthermore, it is the object of the invention to provide such a motor vehicle in a simple and cost-effective manner, which nevertheless achieves and guarantees a desired comfort and necessary safety and at the same time improves known systems, at least in this respect.

This is achieved according to the present invention by a vehicle having the features of claim 1.

Preferred embodiments are subject of the appended claims.

The invention will be explained in more detail with reference to FIGS.

Showing:

1 a schematic representation of a motor vehicle,

2 a block diagram,

3 a block diagram,

4 a block diagram,

5 a block diagram,

6a a block diagram,

6b a block diagram and

7 a block diagram.

The 1 shows a schematic representation of a motor vehicle 99 with a drive unit 1 such as internal combustion engine or engine, a torque transmission system 2 like clutch, a transmission 3 in the drive train. Furthermore, a differential 4 , Output shafts 5 and driven by the output shafts wheels 6 shown. Furthermore, the vehicle has 99 about a device 98 for controlling the automatically actuated clutch 2 and / or the automatically operable transmission 3 ,

On the wheels can speed sensors 97 be arranged, which detect the rotational speeds of the wheels. The speed sensors may also functionally belong to other electronic units, such as an anti-lock brake system (ABS). From at least one wheel speed, at least one vehicle speed and / or one transmission speed can be determined by means of a control unit. Other sensors can be door contact sensors 28 and a throttle position sensor 29 be. Furthermore, an idle switch may be integrated in the accelerator pedal sensor (load lever sensor) indicating that the accelerator pedal is not actuated.

The drive unit 1 , Can also be configured as a hybrid drive with, for example, an electric motor, a flywheel with freewheel and an internal combustion engine.

The torque transmission system 2 is designed as a friction clutch, such as dry friction clutch or in another embodiment than in a fluid such as oil, wet-running friction clutch, the torque transmission system can also be configured, for example, as a magnetic particle clutch, multi-plate clutch or torque converter with lockup clutch or other clutch. The friction clutch may also be formed as a self-adjusting, self-adjusting clutch.

Furthermore, one recognizes a control unit 7 and a schematically illustrated actuator 8th , The control unit 7 may be formed as an integrated control unit, which performs the control or regulation of, for example, the torque transmission system and the transmission or the circuit of the transmission stages. Furthermore, the engine electronics can also be integrated in the control unit. It is also possible that the control unit of torque transmission system, transmission and / or motor are arranged separately and communicate with each other via data or signal lines. The control unit 7 is equipped with a computer unit to process the incoming signals and system sizes, save and forward. Furthermore, the control unit generates control variables and / or signals for controlling the actuators for actuation.

The transmission may be in one embodiment, a transmission with traction interruption during the shift or gear change. In another embodiment, the transmission may be a transmission without traction interruption in a gear change.

The torque transmission system 2 is on a flywheel 2a mounted or connected thereto, wherein the flywheel may be a split flywheel with primary mass and secondary mass, with a damping device between the primary mass and the secondary mass, to which a starter ring gear 2 B is arranged. The clutch has a clutch disc 2c with friction linings and a pressure plate 2d as well as a clutch cover 2e and a plate spring 2f on. The self-adjusting clutch additionally has means which allow an adjustment and a wear adjustment, wherein a sensor, such as force or displacement sensor is present, which detects a situation in which an adjustment is necessary and can also be carried out in a detection.

The torque transmission system is by means of a releaser 9 , such as pressure fluid operated, such as hydraulic, Zentralausrücker actuated, the disengagement a release bearing 10 can carry and by applying the clutch on and disengaged. The releaser can also be configured as a mechanical release, which operates a release bearing or a comparable element, acted upon or operated.

The actor 8th , like actuator unit, controls via a pressure medium line 11 or -übertragungsstrecke, such as hydraulic line, the fluid-operated, such as hydraulic, Zentralausrücker 9 for engagement or disengagement of the clutch. The actor 8th actuates further with its at least one output element or with a plurality of output elements, the transmission for switching, wherein, for example, a central shift shaft of the transmission is actuated by the output element or the output elements. The actuator thus operates internal gear shift elements of the transmission for inserting, removing or changing gears or gear ratios, such as a central shift shaft or shift rails or other switching elements.

The actor 8th can be divided into at least two sub-actuators in one embodiment, wherein the one actuator for automated actuation of the clutch contains at least one drive and at least the second actuator includes at least one drive for automated actuation of the gearshift of the transmission. The actuators can be designed as a structural unit or arranged in separate housings. Furthermore, the control electronics can be arranged or integrated within the actuators or arranged within a separate housing.

The actor 8th may also be configured or provided as a shift drum actuator, which is arranged within the transmission. The shift drum actuated by a driven self-rotation in Guides guided elements, such as switching elements, for switching the gear stages. Furthermore, the actuator for switching the gear ratios may also include the actuator for actuating the torque transmission system, in which case an operative connection to the clutch release is necessary.

The control unit 7 is via the signal connection 12 connected to the actuator, so that control signals and / or sensor signals or operating state signals can be exchanged, forwarded or queried. Furthermore, the signal connection 13 and 14 available via which the control unit are at least temporarily in signal communication with other sensors or electronic units. Such other electronic units may be, for example, the engine electronics, anti-lock braking system electronics or traction control electronics. Other sensors may be sensors that generally characterize or detect the operating condition of the vehicle, such as engine or wheel speed sensors, throttle position sensors, accelerator position sensors, or other sensors. The signal connection 15 establishes a connection to a data bus, such as CAN bus, over which system data of the vehicle or other electronic units can be made available, since the electronic units are usually networked together by computer units.

An automated transmission may be switched or undergo a gear change so that it is initiated by the driver of the vehicle by giving a signal to shift up or down by, for example, a switch or transmission selector. Furthermore, a signal could be given to select the next gear to be engaged. Accordingly, a signal can be made available by means of an electronic shift lever, in which gear the transmission should switch.

In another transmission program, an automated actuation of the transmission can be selected, so that the choice of the current gear is performed in dependence on the operating parameters and optionally a switching process is initiated automatically. However, an automated transmission can also independently perform a gear change by means of, for example, characteristic values, characteristic curves or characteristic diagrams and on the basis of sensor signals at certain predetermined points, without the driver having to initiate a gear change.

Furthermore, for example, a neutral position N can be set, in which there is no drive connection between the transmission input and transmission output. Furthermore, a parking position P can be selected, in which a parking lock is realized. This parking position can also be selected automatically when, for example, the ignition key 51 is deducted from the ignition and the operating condition of the vehicle allows this. For example, a withdrawal of the ignition key is called at high speeds, in which situation a parking brake should not be automatically inserted.

The transmission selection unit 40 can thus be set to a range M, such as manual driver-side gear selection, a range D, such as automatic gear selection for driving, a range P, such as parking lock, and / or a range N, such as neutral position. Furthermore, a manual switch can be initiated via, for example, a switch or a lever.

The vehicle is preferably with an electronic accelerator pedal 23 or load lever equipped with the accelerator pedal 23 a sensor 24 controls, by means of which the engine electronics 20 For example, the fuel supply, ignition timing, injection time or throttle position via the signal line 21 of the motor 1 controls or regulates. The electronic gas pedal 23 with sensor 24 is over the signal line 25 with the engine electronics 20 signal-connected. The engine electronics 20 is over the signal line 22 with the control unit 7 in signal connection. Furthermore, also a transmission control electronics 30 in signal communication with the units 7 and 20 stand. An electromotive throttle control is expedient for this purpose, wherein the position of the throttle valve is controlled by means of the engine electronics. In such systems, a direct mechanical connection to the accelerator pedal is no longer necessary or expedient.

The vehicle also has an engine starting device 50 which starting from a driver-side engine start attempt by means of, for example, an actuation of the ignition key 51 in the ignition of an engine electronics and a starter drives for starting and / or starting the engine. However, a startup procedure can only be initiated if a start enable is present. If the start release is present, the starter can be activated and energized. If no start release is available, an electrical or electronic measure can be taken to prevent the starter from starting the engine. For example, a relay can be locked or by electronics, the power supply to the starter can be interrupted. For example, the control unit may set a start enable bit which is interrogated when a start attempt is to be made.

The 2 shows a diagram illustrating a flow for use within the Vehicle, being at block 100 For example, by means of an ignition key actuation an engine start attempt is initiated on the driver side. In block 101 becomes the position of the gear selection element 40 in position P, that is, whether the transmission is in parking position queried. It is also appropriate if the transmission state is queried and it is determined whether the state P is present. In block 102 is queried whether a foot brake is operated on the driver side. Likewise, it can be queried whether a parking brake, such as handbrake, or a service brake is actuated. The can be queried for example via the brake light. Is in block 102 a brake is applied and the query is answered in the affirmative, so controls the control unit in block 103 the torque transmitting system and disengages the clutch. In block 104 the starter release or engine start release is issued and the engine is started by means of a starter. Is the brake control in block? 102 not before, so at block 100 continue and a starter release is not granted for the time being.

The 3 shows a further embodiment for illustrating a procedure for use within the vehicle, wherein at block 150 an engine start attempt is initiated on the driver side. In block 151 becomes the position of the gear selection element 40 in position P queried. It is also appropriate if the transmission state is queried and it is determined whether the state P is present. In block 152 a brake, such as a parking brake, hand brake, or service brake is automatically operated. This can be realized, for example, by the handbrake being automatically tightened by an actuator, such as an electric motor. This step 152 can also be omitted in a further embodiment. In block 153 the control unit actuates the parking brake realizing element, such as the torque transmission system and triggers or unlocks the parking brake. For example, the clutch is disengaged. In block 104 the starter release or engine start release is issued and the engine is started by means of a starter. The unlocking of the parking brake can take place in that the intended for the realization of the parking brake i transmission gear is automatically taken out.

The 4 shows a further embodiment, wherein in block 200 For example, by means of an ignition key, an engine start attempt is made. In block 201 is queried or determined whether the transmission is in a neutral position N. Furthermore, in block 202 queried whether a brake, such as the foot brake is pressed. If this question is answered in the affirmative, it will be in block 203 gives a starter release or engine start enable and the engine is started. Is the brake in block 202 not pressed, is at block 200 continued and for the time being no start release issued.

The 5 shows a further embodiment, wherein in block 250 For example, by means of an ignition key, an engine start attempt is made. In block 201 is queried or determined whether the transmission is in a driving position D (drive). This position may include an automated or driver-side control of the shifts, with a driving gear, such as one of the gears 1 to 5 or a reverse gear, is usually inserted. Furthermore, in block 252 queried whether a brake, such as the foot brake is pressed. If this question is answered in the affirmative, it will be in block 253 the torque transmission system is opened or disconnected and in block 254 gives a starter release or engine start enable and the engine is started. In block 255 the clutch is closed again so that when the gear is engaged the vehicle starts to creep. Is the query included? 252 answered negatively, so at least no start release issued.

In a further embodiment of the invention may be in block 253 Also, a neutral position in the transmission are inserted before the engine is started. Subsequently, the gear can be re-engaged with the clutch disengaged.

Furthermore, it may be expedient if further safety aspects are taken into account and must be met as a necessary condition before an engine start release takes place. For example, under these conditions, queries regarding closed safety contacts, such as door contacts, bonnet contacts, seat contacts and / or belt contacts can be. These contacts guarantee that no safety-related situation arises due to unintentional opening.

As a vehicle standstill device or vehicle locking device, for example, a braked component or a lockable unit may be provided, for example, within the transmission, which realizes a parking lock, for example by a positive or frictional connection. In this case, the engine drag torque of the internal combustion engine can be exploited for parking brake.

The 6 shows in a block diagram 300 an embodiment for controlling the device according to the invention 98 in the motor vehicle according to the invention 99 , at 301 the device is turned on by means of an element, such as the ignition key. Subsequently, the microprocessor of the control unit 7 in block 302 booted up, so he is ready for use. After that, in block 303 queried whether a parking position or a drive within the transmission is engaged. If this is not the case and the neutral range is engaged in the transmission, at block 304 the engine switched to be able to start, this being done, for example, by a bit set in the control unit, whereupon the control unit communicates with the engine control via the data bus and the engine control unit starts the engine in a driver-side starting attempt by means of the actuated ignition key. In block 305 the clutch is automatically disengaged. In one embodiment, then in block 306 a starting gear are engaged, so that the vehicle can start at a subsequent accelerator pedal operation. If there is a parking position or a gear in the gearbox, the clutch remains in block 307 engaged and the engine is in block 308 not bootable. As driving all forward and all reverse driving, in which a torque is transferred from the engine to the drive wheels in the engaged case.

The 6b shows in a block diagram 310 an embodiment in modification of the diagram 300 of the 6a , The blocks 311 to 315 essentially correspond to the blocks 301 to 305 , Their function may be under the description of 6a be read. In block 316 no engine start enable is given and the engine is not bootable. In block 317 If the clutch is disengaged when the parking position P or travel 1,..., 5 or 6 is engaged, and / or a neutral range is automatically set in the transmission. Subsequently, in block 318 the engine is switched to start and / or it is given a start release, so that the engine is started at a driver-side start attempt by the engine control. If necessary, then a starting gear can be engaged.

The 7 shows a block diagram 400 to illustrate an embodiment of the use of the device according to the invention. In block 401 the system, as the ignition of the engine is switched off. The control unit remains active. This takes place, for example, after completion of the journey with the vehicle. Subsequently, in block 402 a parking brake automatically inserted by a drive gear is engaged in the transmission. In block 403 the clutch is automatically closed. Thereafter, the control unit turns off automatically after expiration, for example, a waiting time.

In block 405 The ignition of the vehicle and the control unit is turned on. In block 406 the microprocessor of the control unit is booted (booted). In block 407 the transmission neutral is queried. If Neutral N is in the gearbox, the engine is in block 408 startable and the clutch opens in block 409 , In a driver-side engine start attempt, the engine is started. If there is no neutral gear in the transmission, is at 410 no clutch operation performed, that is, the disengagement of the clutch is prevented. In block 411 There is also no automated transmission control and the engine is in block 411 not bootable. Before starting, the neutral range must be inserted in the gearbox.

Claims (10)

Motor vehicle ( 99 ) with a drive unit ( 1 ), with an automated torque transmission system ( 2 ) and an automated transmission ( 3 ), with a device ( 98 ) for controlling the automated torque transmission system ( 2 ) and the automated transmission ( 3 ) with a control unit ( 7 ) and at least one of the control unit ( 7 ) controllable actuator ( 8th ) for actuating the torque transmission system ( 2 ) and for switching a transmission ratio ( 3 ), the control unit ( 7 ) is in signal connection with at least one sensor and optionally with other electronic units and an engine starting device ( 15 ), with a transmission selection element which determines and / or detects the engaged transmission position and / or the engaged transmission program, characterized in that in one in the transmission ( 3 ) inserted parking position (P) or driving in a start attempt of the drive unit ( 1 ) a start release of the drive unit ( 1 ) from the control unit ( 7 ) to start the drive unit ( 2 ) and the torque transmission system ( 2 ) is automatically disengaged and / or a neutral position of the transmission ( 3 ) is automatically inserted when a vehicle standstill device is operated or is operated. Motor vehicle ( 99 ) according to claim 1, characterized in that the vehicle standstill device is a service brake or a parking brake. Motor vehicle ( 99 ) according to claim 1 or 2, characterized in that in one in the transmission ( 3 ) inserted parking position (P) at a start attempt of the drive unit ( 1 ) a parking lock is automatically unlocked and a start release of the drive unit ( 1 ) from the control unit ( 7 ) to start the drive unit ( 1 ) he follows. Motor vehicle ( 99 ) according to one of claims 1 to 3, characterized in that an actuation of the vehicle standstill device is automated. Motor vehicle ( 99 ) according to one of the preceding claims, characterized in that when a parked in the transmission parking position (P) is a blocking of the drive train by a blocking element for the realization of a parking brake. Motor vehicle ( 99 ) according to one of the preceding claims, characterized in that at a neutral position (N) inserted in the transmission in a start attempt of the drive unit ( 1 ) one Release from the control unit ( 7 ) to start the drive unit ( 1 ) not happened. Motor vehicle ( 99 ) according to claim 6, characterized in that in the additional presence of an actuation of an actuatable element, a start release is made when the neutral range (N) is engaged. Motor vehicle ( 99 ) according to claim 7, characterized in that an operation is present when at least one of the following conditions are met: - an idle switch is actuated - a load lever value is smaller than a predeterminable limit value, - a throttle angle value is smaller than a predefinable limit value, - the service brake is activated, - the parking brake is activated, - a sensor indicates a closed vehicle door. Motor vehicle ( 99 ) according to one of claims 1 to 8, characterized in that is inserted again after the start of the drive unit of the inserted before the start and designed for starting the drive or the driving program. Motor vehicle ( 99 ) according to one of the preceding claims, characterized in that the control unit ( 7 ) one in the transmission ( 3 ) inserted position or an engaged state detected on the basis of the transmission selection element and / or a transmission selection sensor.

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