DE10243276A1 - Unit controlling gear selector lever interlock, determines vehicle speed before allowing parking lock application to transmission - Google Patents

Abstract

The lever (5) interlock (3) (or stop) is selectable. The controller (1) tests the vehicle speed (V) and is able to prevent shifting of the gear selector into the parking position (P) if appropriate, hence controlling whether or not the transmission parking lock (7) shall be set. An Independent claim is included for the corresponding method

Description

The invention relates to a device and a method for controlling a selector lever lock, in particular to prevent abusive activity a parking lock by moving a selector lever of an automatic transmission of a motor vehicle, in which the selector lever lock on a control unit is controllable so that at least one shift of the selector lever from at least one parking position of at least one operating condition depending on the vehicle is.

Automatic transmission of motor vehicles usually have a gear integrated parking lock system. This is usually the case using a selector lever, for example about a cable, operated from the driver's seat of the vehicle. The selector lever is in one or more speed steps (D), in a reverse speed step (R), in a parking position (P) and in a neutral position (N) displaceable.

To increase operational safety are selector lever locks known that moving the selector lever in particular from the Avoid parking position, for example when the brake pedal not activated below a predetermined vehicle speed, i.e. before the vehicle starts or if the ignition key is not in the ignition lock plugged. You can the blocking conditions applied individually or in combination of several become. The aim is to prevent the vehicle from moving unintentionally parked vehicle, for example rolling away on a sloping road, to prevent. Parking lock systems are often implemented with so-called "shift lock" magnets, at which a solenoid is controlled with a movable anchor bolt is such that when the parking lock is activated, the anchor bolt in extends a recess and thereby a movement of the selector lever blocked from the parking position. Systems are also reversed known that block the removal of the ignition key, for example, if not the parking position is engaged. This is to prevent that the vehicle is left unsecured against rolling away.

The problem here is that while driving the well-known selector lever locks no protection against unintentional engagement of the parking lock Offer. An accidental selector lever movement can cause this However, the case does occur. This creates strong unpleasant punch noises, comparable with a hammer mill by a rejection of a jack system originate. The components of the parking lock are also heavily stressed by what increased and thus cost-intensive, strength requirements of the concerned Parts must be kept.

From the DE 199 33 320 A1 is a shift lock device for the selector lever of an electronically controlled automatic transmission is known, in which an actuator is provided which is adjustable in at least two end positions, and in which by means of the two end positions the shifting of the selector lever from a parking position (P) in the presence of a first condition and is prevented from a second position (N) in the presence of a second condition.

The disadvantage is that the known shift lock device, although the shift of the selector lever from the parking position and another position at certain Can prevent conditions, but not engaging the parking lock during the Journey. The second position is in particular the neutral position (N), i.e. the idle at which the vehicle is not driven. A complete one Blocking of the selector lever would be out of a gear (D) however, especially in vehicles with multiple speed levels, not meaningful. Therefore can not be effective with the known shift lock device Protection against unauthorized insertion of the parking lock during the Ride can be realized.

From the EP 0 650 000 A1 an electronic control system for a continuously variable automatic transmission for motor vehicles is known. The aim of the control system is to avoid the dangers that arise from unintentionally moving a selector lever and parking the vehicle without a parking lock inserted. For this purpose, instead of a selector lever, pressure switches are provided on the dashboard, which correspond to different positions of the selector lever. The control system has means that regulate the engagement of the parking lock depending on the vehicle speed. The parking lock and reverse gear cannot be engaged above a certain speed. When the ignition is switched off, the parking lock is automatically engaged if the vehicle speed is below a certain limit at the same time. The control acts on the gear mechanism by allowing or preventing the gear mechanism from moving into certain gear positions under certain operating conditions.

The disadvantage is that the system is on Automatic gearbox with selector lever not transferable is because there is no selector lever lock controls. The system is also for automatic transmissions with stages, especially with several speed steps, only conditionally suitable, because by switching between different speed levels Driver often be distracted from observing the lane because the respective Switches on the dashboard should first be targeted, whereby driving safety impaired would. When actuated a selector lever on the other hand, the driver is not or only insignificantly from the traffic distracted. To do this, it is operated via a push switch on the dashboard relatively uncomfortable compared to operating a selector lever.

Object of the present invention It is therefore a device for preventing abuse Actuate to create a parking lock for automatic transmissions of motor vehicles, which enables high operational safety when the vehicle is in operation and in all types of electronically controlled automatic transmissions can be used with selector lever is.

The task is inventively in connection solved with the preamble of claim 1 in that the selector lever lock the selector lever dependent on the existence of at least one first operating condition for insertion the parking lock, for testing one, about the control unit detectable vehicle speed ν is used, can be activated or can be deactivated, such that the shifting of the selector lever from a position adjacent to a parking position of the selector lever can be blocked or released into the parking position.

In addition to the function of Selector lever lock, an abusive Solving the Preventing a parking lock can be achieved by speed-dependent activation, or deactivating the improper insertion of the parking lock during the Avoid driving. Preferably, the selector lever lock with the additional functions with a "Shift-Lock" magnet that is usually present anyway and which prevents unauthorized release of the Parking lock blocked by a corresponding control via the control unit will be realized. The "Shift-Lock" magnet can do this a lock, for example an anchor bolt, in a recess a backdrop in which the selector lever is displaceable, the recess being adjacent to the parking position the selector lever is arranged, snap into place. Depending on the operating condition and position the selector lever in the park position or outside the parking position can then be extended, i.e. Loosen or insert the Parking lock prevented or enabled by the control. The selector lever lock locks the selector lever only opposite the parking position, but not compared to other selector lever positions, so moving the selector lever, for example in the neutral position, or between different Driving programs during the ride, of course still possible is. This will lock the parking lock against abuse safely protected in all operating situations and for the automatic transmission high level of Operational safety and reliability reached. Through the parking lock protection, the strength requirements the parking lock components are reduced, which in addition to the Additional security gain Cost advantage results.

According to a preferred embodiment of the Invention is the control device integrated in the selector lever.

The control unit integrated into the selector lever for control the selector lever lock hires one independently is a functioning component, this means that others are particularly useful ECUs no changes necessary. It can therefore be almost universal in a wide variety of vehicle types to be built in. The control line between the selector lever and selector lever lock can be very short.

According to a further preferred embodiment the invention is the control unit an integral part of a transmission control unit.

The integration of the selector lever lock control in a transmission control unit let yourself when using and expanding automatic transmissions anyway implement existing and suitable transmission control units particularly cost-effectively. there there is no additional Space for the installation.

According to another preferred embodiment The invention is through the control device in addition to the first, the vehicle speed v taking into account Operating condition, at least one second operating condition in the form one operated or not operated Brake pedal over a brake sensor and / or in the form of an on or off Ignition over a ignition key detectable.

Due to the possibility that the control unit further Sensor data recorded, in particular the actuation of the brake pedal and / or the ignition, become the tax options for using the selector lever lock both as operating conditions for loosening or maintaining the Selector lever lock off out of the parking position, as well as into the parking position and further improved.

The known control methods a selector lever lock have the disadvantage that they misuse the parking lock in an automatic transmission of a motor vehicle during the Do not prevent driving and therefore a relatively low safety standard Offer.

Another task of the present The invention is therefore to develop a method that is high Operational safety when driving a motor vehicle against misuse Actuate the parking lock ensures.

The object is achieved in connection with the preamble of claim 5 in that at least the vehicle speed ν of the vehicle is detected with the aid of a sensor and the selector lever lock is activated to prevent the parking lock from being engaged when the vehicle speed ν is greater than a limit speed ν _lim , and that there is a first operating condition for engaging the parking lock, so that the selector lever lock for enabling the parking lock to be engaged is deactivated when ν ≤ ν _lim .

Up to a certain limit speed ν _lim , a safe and harmless engagement of the parking lock is permitted, above this limit speed ν _lim the actuation lock of the Selector lever, ie the selector lever lock, effective. For this purpose, the vehicle speed ν is continuously recorded with the aid of _{sensors and} compared with the limit speed ν _lim . The signal acquisition preferably begins after the engine is started or the parking lock is released. If the limit speed ν _lim is exceeded, the selector lever lock is activated in the direction of the parking position.

In principle, however, it is also conceivable that the selector lever lock is only activated when driving, if necessary, ie when the driver tries to move the selector lever from a position adjacent to the parking position to the parking position without permission. For this purpose, a device for detecting the position of the selector lever, for example a position sensor, could additionally be provided, by means of which the control unit detects an attempt to operate the selector lever without authorization and if ν> ν _lim the selector lever lock is activated immediately.

According to a preferred embodiment of the invention, the selector lever lock for moving the selector lever into the parking position (P) is only deactivated if, in addition to the first operating condition, which is fulfilled at a vehicle speed ν ≤ ν _lim , at least a second operating condition of the vehicle is fulfilled , The second operating condition can be actuation of the brake pedal and / or switching off the ignition of the vehicle, which is registered by the control device.

After activating the selector lever lock for the parking lock is it for maximum operational safety advantageous that the deactivation takes place only if the intention the vehicle actually exists to park or at least bring it to a standstill. For this, the activity the foot brake and turning off the ignition can be used as a further criterion. Analogously to the Move the selector lever from the parking position, operating the brake pedal and that Switch on, or a switched on ignition as operating conditions be assumed.

According to a further preferred embodiment of the invention, the limit speed is predefined with ν _lim 5 5 km / h.

At a vehicle speed ν = 0km / h , i.e. with actual In any case, the vehicle is stationary when the parking lock is engaged (taking into account if necessary other operating conditions) possible without abuse. At a very low one However, speed, such as when the vehicle rolls out, can with most gearboxes, it is harmless and safe to insert the parking lock. The practical handling of the vehicle is thereby improved.

According to a further preferred embodiment The invention uses an output signal to detect the vehicle speed ν at least one transmission output speed-dependent sensor present in the vehicle as an input signal for the control unit used, and from this the vehicle speed is determined. It can also a wheel speed dependent Signal can be used.

Mostly from the automatic transmission yourself over the transmission output speed generates a tachometer signal. This can in a simple way for the control unit to control the selector lever lock be used. Likewise, there is usually wheel speed data in modern vehicles, for example from ABS sensors. Own, additional and therefore costly sensors are not required.

Further details of the invention result from the following detailed description and the attached Drawings in which preferred embodiments of the invention for example are illustrated. Show it:

1 a block diagram of an automatic transmission with a selector lever lock with detection of a wheel speed (ABS signal) and

2 the block diagram with detection of a transmission output speed (speed signal) instead of the wheel speed.

A device for controlling a selector lever lock 3 a selector lever 5 an automatic transmission 9 consists essentially of a control unit 1 , via which the selector lever lock 3 can be controlled such that the shifting of the selector lever 5 from a position adjacent to a parking position P of the selector lever into the parking position P for inserting a parking lock 7 is prevented or made possible.

In the, in 1 shown embodiment is the selector lever 5 in the position R (reverse step) adjacent to the parking position P. The selector lever can take up further positions, for example a neutral position N, a driving position D or the parking position P. The selector lever 5 is about a cable 6 with the parking lock 7 , which is designed in principle known design, connected. The parking lock 7 is in the automatic transmission 9 integrated that a drive motor 8th upstream of the vehicle and can be connected to it via a coupling (not shown). By moving the selector lever 5 in the parking position P, or out of the position P, the parking lock can be inserted or released.

The selector lever lock 3 is advantageously designed as an anchor bolt, which is in a recess 13 a backdrop 12 in which the selector lever 3 is slidably supported, protrudes. In this position of the bolt 3 is the selector lever lock 3 activated so that the selector lever 5 cannot be moved to the parking position P if it is in an adjacent position, for example in the R position. The selector lever is located 5 on the other hand, in parking position P he can with the selector lever lock activated 3 not be moved out of the parking position P, for example to secure the vehicle against rolling away.

Via a pull magnet 4 can the bolt 3 into the recess 13 be moved or withdrawn sideways so that the selector lever lock 3 is activated or deactivated. The train magnet 4 is via a control line to the control unit 1 connected and is energized by this, causing the bolt 3 can move over magnetic force. The control unit 1 can be advantageous in the selector lever 5 be integrated. But it can also be part of a transmission control unit, as in 1 shown. The control unit 1 can measure the wheel speed of a sensor via a signal line as an input signal 10 , advantageously receive an anti-lock braking system (ABS) sensor present in the vehicle. It is also possible to use a transmission output speed sensor as an input signal 11 from the gearbox 9 self-generated speedometer signal, via a signal line between the sensor 11 and the control unit 1 to use ( 2 ).

A method for controlling a selector lever lock 3 to prevent misuse of a parking lock 7 by moving a selector lever 5 an automatic transmission 9 of a Krafffahrzeug is essentially based on the selector lever lock 3 through a control unit 1 , which detects a vehicle speed ν, is activated or deactivated depending on an operating condition based on the vehicle speed ν.

After starting the engine 8th or releasing the parking lock 7 receives the control unit 1 as an input signal, for example the wheel speed of an ABS sensor 10 , which is converted into the vehicle speed ν. During the journey, the vehicle speed ν is continuously compared with a stored limit speed ν _lim , advantageously set at ν _lim = 5km / h. If ν> ν _lim is determined by energizing a pull magnet 4 who have favourited Selector lever lock 3 , or the bolt 3 , in a recess 13 a backdrop 12 locked, causing the selector lever lock 3 takes effect and a shift of the selector lever 5 into parking position P is not possible. As long as the condition ν> ν _lim is present, the actuation lock of the selector lever remains 5 effective. If the vehicle speed ν drops so that ν ≤ ν _lim applies, the current supply to the pull magnet becomes 4 interrupted and as a result the selector lever lock 3 withdrawn or canceled. Deactivating the selector lever lock 3 can also be made dependent on other conditions. An accidental, ie improper, insertion of the parking lock 7 is excluded during the journey.

P

parking position the selector lever (Park)

R

Reverse position (Reverse)

N

neutral position (Neutral)

D

Forward driving position (Drive)

1

control unit

2

selector lever module

3

selector lever lock

4

pull magnet

5

selector lever

6

cable

7

parking lock

8th

drive motor

9

automatic transmission

10

Wheel speed sensor (SECTION)

11

Transmission output speed sensor (Tacho)

12

selector lever gate

13

recess

Claims (10)

Device for controlling a selector lever lock, in particular for preventing an improper actuation of a parking lock by moving a selector lever of an automatic transmission of a motor vehicle, in which the selector lever lock can be controlled via a control unit, so that at least one shift of the selector lever from at least one parking position of at least one operating condition of the vehicle dependent, characterized in that the selector lever lock ( 3 ) of the selector lever ( 5 ) depending on the existence of at least one first operating condition for engaging the parking lock ( 7 ), for testing one, via the control unit ( 1 ) detectable vehicle speed ν is used, can be activated or deactivated, such that the shifting of the selector lever ( 5 ) can be blocked or released from a position adjacent to a parking position (P) of the selector lever into the parking position (P). Device according to claim 1, characterized in that the control device ( 1 ) is integrated in the selector lever. Device according to claim 1, characterized in that the control device ( 1 ) is an integral part of a transmission control unit. Device according to one of claims 1 to 3, characterized in that the control device ( 1 ) in addition to the first operating condition taking into account the vehicle speed ν, at least one second operating condition in the form of an actuated or non-actuated brake pedal can be detected via a brake sensor and / or in the form of an on or off ignition via an ignition key position. Method for controlling a selector lever lock, in particular for preventing an improper actuation of a parking lock by shifting a selector lever of an automatic transmission of a motor vehicle, in which the selector lever lock is controlled by a control unit, so that at least one shift of the selector lever from at least one parking position of at least one operating condition of the vehicle is dependent, characterized in that via the control unit ( 1 ) at least the vehicle speed ν of the vehicle is detected with the aid of a sensor, and that the selector lever lock ( 3 ) to prevent the parking lock from being inserted ( 7 ) is activated when the vehicle speed ν is greater than a limit speed ν _lim and that a first operating condition for engaging the parking lock ( 7 ) is present so that the selector lever lock ( 3 ) to enable the parking lock to be inserted ( 7 ) is deactivated if ν ≤ ν _lim . A method according to claim 5, characterized in that the deactivation of the selector lever lock ( 3 ) to move the selector lever ( 5 ) into parking position (P) only occurs if, in addition to the first operating condition, which is fulfilled at a vehicle speed ν ≤ ν _lim , at least a second operating condition of the vehicle is fulfilled. A method according to claim 6, characterized in that the second operating condition is an actuation of the brake pedal and / or switching off the ignition of the vehicle by the control unit ( 1 ) is registered. Method according to one of claims 5 to 7, characterized in that the limit speed ν _lim ≤ 5km / h. Method according to one of Claims 5 to 8, characterized in that, in order to detect the vehicle speed ν, an output signal of at least one transmission output speed-dependent sensor present in the vehicle as an input signal for the control unit ( 1 ) is used and the vehicle speed ν is determined from this. Method according to one of Claims 5 to 8, characterized in that, in order to detect the vehicle speed ν, an output signal from at least one wheel speed-dependent sensor present in the vehicle as an input signal for the control unit ( 1 ), and the vehicle speed ν is determined from it.