DE10328313A1 - Method for switching control of an automated motor vehicle transmission - Google Patents

Abstract

The process involves activating a switching process by a driver in a manual operating mode for activating a control unit switching, from a neutral to a switching position. The maintenance time is determined by the unit in the switching position. A switching mode of transmission of a motor vehicle changes between an individual switching process with low maintenance time and multiple switching processes with high maintenance time.

Description

The The invention relates to a method for switching control of an automated Automotive transmission, in which in a manual operating mode, a switching operation from a driver by an actuation a shift operating element from a neutral position in one Switch position triggered manually becomes.

modern Motor vehicles are increasingly being equipped with automated transmissions which have no mechanical connection between the switching control elements, such as. a shift lever, and the transmission is made. In an automated transmission of The type in question may be an automated manual transmission (ASG), a dual-clutch transmission (DCT), a gearbox, or a continuously variable transmission (CVT). such have automated transmissions mostly over an automatic operating mode (automatic mode) and a manual one Operating mode (manual mode). In the automatic mode, a switching operation or a change the set transmission ratio dependent on of operating parameters, such as the vehicle speed, the Engine speed, accelerator pedal position, etc., automatically from one Transmission Control Module triggered and by an appropriate actuation of actuators for and disengaging the engine clutch and / or certain internal transmission clutches or switching brakes or to adjust a variator performed. In the manual mode, the driver can a switching operation by the operation of a meant for Schaltbedienungselementes, such as a arranged in the center console shift / selector lever, the manual release a shift in a manual shift gate from a neutral position out for an upshift in a "+" - direction and for a Downshift pivotable in a "-" direction is, and / or one of mostly two on both sides behind the steering wheel arranged switching paddles and / or one / of several the steering wheel arranged pressure or toggle switches, respectively the trigger trigger electrical control signals manually (shift-by-wire). in this connection is usually carried out before the relevant shift in the transmission control unit in a upstream operational safety check checks whether the intended switching operation in the current driving condition of the motor vehicle while maintaining the permissible Operating limits, e.g. in terms of compliance with the given Speed limits of the drive motor, is possible. In compliance with the permissible Operating limits, the switching process is enabled and performed at Non-compliance with the operating limits, the switching process is prevented and not done or at least delayed as long as until the driving condition is adjusted so far that the intended switching operation possible is. The switching process itself is usually around a sequential circuit, i. it will be in relation to the beginning gear engaged in the switching operation in the next higher or next lower gear. In a CVT transmission with several permanently programmed gear ratios the same applies mutatis mutandis even if the translation stages concerned not switched but over set a fast continuous adjustment of a variator become. Due to the different types of automated Motor vehicle transmission is below uniformly of grades the speech, which the corridors from ASG and DKG, the gears of automatic gearboxes, and the gear ratios of CVT are meant.

Want a driver manually in a so-called multiple switching several times to switch in quick succession in the same direction, he has to the prior art, the switching control element several times in a row in the appropriate direction. If, for example a suitably equipped Motor vehicle a gradient Towards an intersection with initially about 115 km / h, at the permissible top speed in a so-called speed funnel gradually from 100 km / h over 70 km / h is reduced to 50 km / h to turn there, so is the driver usually switches back manually, to take advantage of the braking effect of the drive motor. In the meantime common a high number of gears, this can require up to five downshifts must be triggered individually by the driver. In each case attacks before the implementation every single downshift the o.a. Reliability testing, so that at too high a driving speed at least some of the downshifts first repressed and u.U. must be triggered by the driver several times before, possibly through one also by a brake operation the driver, occurred delay of the motor vehicle respectively for the next Gear ratio maximum speed is reached. By such a multiple operation of the switching operation element the driver is heavily stressed in his concentration, so that he devoted his attention only partially to the rest of the traffic can. In addition to the consequent loss of safety and comfort is Also, the timing of the individual circuits not optimal.

From the DE 199 63 752 A1 Although a method for controlling a switching operation in motor vehicles with a sequentially switching automatic transmission is known in which in special driving conditions, especially in emergency braking, a multiple switching operation with several aufeinan the following individual circuits can be triggered and performed. However, the method in question only relates to an automatic triggering of the individual circuits, ie to the automatic mode of a gearbox or an automated motor vehicle transmission.

It Thus, the problem of the present invention is a method specify with the case of an automated automotive transmission, a multiple shift be triggered more easily and safely by a driver in manual mode can.

The Problem is inventively in connection solved with the preamble of claim 1, characterized in that a holding time of the Switching control element is detected in the switching position, and that a switching mode of the vehicle transmission depends on the length of the Hold time between a single shift with a shorter hold time and switches a multiple shift with a longer hold time, wherein in a single switching operation, a single circuit with a single change of the gear stage is performed and in a multiple shift several consecutive individual circuits with one each rectified change of gear ratio can be performed.

advantageous Embodiments of the method according to the invention are in the dependent claims 2 to 18 indicated.

With the method according to the invention a driver now has the option a multiple switching operation with several short-term successive trigger sequential single circuits in that it is one of the existing Switching controls, e.g. the corresponding shift paddles, permanently holds in the switching position. The Individual circuits themselves are automatically triggered and executed, provided that the current operating parameters, in particular the driving speed and the engine speed, allow this. The driver is thus from multiple triggering and surveillance the individual circuits freed and can largely on the rest of traffic concentrate and the driving condition, e.g. in a multiple reset by a brake operation, actively support. In an automated mode operable in manual mode Motor vehicle transmission is thus by the method according to the invention both a increase the ease of use as well as an improvement in traffic safety reached. Otherwise, the Multiple switching due to the automated release with optimum speed, i. usually faster than when he was at the usual in the art Manual multiple release the individual circuits possible is.

Around one from the driver possibly as unpleasant switching delay at the beginning of the switching process To avoid, is appropriate first of Switching mode "single switching operation" activated, in which with the achievement of the switching position by the switching control element immediately a first individual circuit is triggered and performed. This will be for the first individual circuit ensures a short response time, independently of, how and when the decision is made between "single switching operation" and "multiple switching operation", or whether it is the individual circuit of a single switching operation or is the first single circuit of a multiple switching operation. Parallel to this begins with the achievement of the switching position by the switching control element expediently also a time counting a Holding time t1, whereby with reaching a predetermined limit holding time T1 the switching mode is changed to "multiple switching", what then when kept in the switching position switching control element the trigger and implementation further rectified individual circuits.

Between the individual circuits of a multiple switching operation is advantageous each provided a switching pause T2, which is used to adjust the driving speed and the engine speed to the next Single circuit is used. As a result, on the one hand, the wear on the Switching elements, in particular the clutches and brakes a gearbox, reduced and due to the lower shift jerk the perceived by the vehicle occupant comfort. To control the switching pause T2 can be proceeded so that with the beginning of the implementation a single circuit a time count the switch waiting time t2 starts, and that with the achievement of the switching pause T2 the next Single circuit initiated and carried out. In this case includes the switching interval T2 the switching time of the preceding individual circuit, so that delays in the circuit sequence of the previous single circuit automatically be compensated. This is possible because of the switching break T2 with approx. 1 second considerably larger than the switching time with is about 0.3 seconds. But it is also possible that the time counting of the Switching time t2 only with the end of the previous individual circuit begins, and that with the achievement of the switching pause T2, the next individual circuit initiated and carried out becomes. In this case, the effective switching pause is equal to the switching pause T2 and thus independent from the circuit sequence of the previous single circuit.

The switching interval T2 can be fixed in principle or can be variably adapted to current operating parameters. So it is possible that a predetermined and stored Zeitkon constant is used as the switching interval T2. However, it is considerably more flexible if one of a plurality of different stored time constants is selected as a function of operating parameters and used as a switching pause T2, the operating direction being in particular the switching direction of the subsequent individual circuit, ie upshift or downshift, the ratio jump between the two gear stages of the following individual circuit, and the active transmission control mode, such as Eco, comfort, or sport, are significant. Thus, the required and appropriate switching interval T2 is generally greater in an upshift than in a downshift, larger in a larger ratio jump than a smaller ratio jump, and active in the eco mode larger than active sports mode. In addition, however, the current driving dynamics, such as the longitudinal acceleration or deceleration, the lateral acceleration, the operation of the driving and braking pedal, etc., detected, and the time constant used as a switching pause T2 thus be adapted to the current driving dynamics. As a result, the shift interval T2 is always optimally adapted to the current driving situation.

in the The extreme case can be the current time constant and the derived time constant Break P2 be zero. Then usually without a break sequentially switched, provided the current operating parameters allow the individual circuits respectively. To shorten the entire multiple switching process However, it is advantageous if in this case in the next individual circuit Immediately, depending on the shift direction, in the smallest possible or highest possible gear is switched. Here you can single gears skipped and saved with these individual circuits.

In front the implementation each individual circuit of the multiple switching operation is advantageously carried out a reliability test, wherein with a positive test result the single circuit is enabled and performed and a negative one test result the individual circuit is prevented. The operational safety check includes essentially a speed control, i. an exam, whether during execution the following individual circuit, the permissible speed limits of Drive motor, the minimum speed at an upshift and the maximum speed at a downshift, be respected.

at a prevented individual circuit, the reliability test is advantageous repeated at regular intervals and possibly the relevant individual circuit enabled and performed, as long as the switching operating element is held in the switching position. This ensures that the desired by the driver advancing as quickly as possible he follows. To avoid too long a switching delay, it is However, it makes sense that in a first-time prevented individual circuit a time counting an adaptation time t3 is started, and that with the achievement a predetermined limit adjustment time T3 of the multiple switching operation ended and returned to the switching mode "single switching operation" becomes.

Basically a multiple switching with leaving the switch position by the switching control element expediently ended and returned to the switching mode "single-circuit operation", wherein a currently in execution single circuit still performed, i.e. is completed.

Further Details of the invention will become apparent from the following detailed Description and attached Drawing, for example, to explain the control method according to the invention serves.

For this shows:

1 A flow chart of the control method according to the invention.

The control method according to 1 is started with the commissioning of the motor vehicle (step 1 ). The switching mode is initially set to "single switching" (step 2 ). Then at regular intervals (pause 4 ), whether one of the existing shift operating elements, such as a shift / selector lever or one of two shift paddles, is in a shift position (step 3 ). If this is the case, ie if the shift / selector lever in the "+" or "-" position or the "+" or "-" shift paddle is held in the shift position, then a first manual shift is triggered ( step 5 ). Immediately thereafter, the time measurement of the holding time t1 starts (step 6 ). Subsequently, an operational safety check is carried out (step 7 ), in which the relevant operating parameters, in particular the driving speed, is checked for compliance with the permissible limit values with regard to the imminent individual switching. If the test result is negative, the operational safety check is carried out at regular intervals (Pause 8th ), taking the break 8th may also include a time count of an adaptation time t3, which is started in the case of the individual circuit prevented for the first time and leads to a termination of the individual switching operation when a predefined limit adjustment time T3 is reached. If the test result is positive, the individual switching is carried out (step 9 ), which is still open at this time, whether it is the only single circuit of a single switching operation or the first single circuit of a multiple switching han delt. In any case, it is thus achieved that the (first) individual circuit is triggered and performed spontaneously on the operation of the switching operation element.

It is then checked whether the switching operating element is still in the switching position (step 10 ). If the driver with the in step 3 determined actuation of the switching control element only a single switching operation, ie wanted to trigger a single individual circuit, he will have the switching control element immediately released, so that it has automatically returned to a neutral position. This will be through the test in step 10 recognized, whereupon the manual switching operation, which in the present case is a single switching operation is terminated (step 11 ) and returned to the beginning. In further held in the switching position switching control element is checked whether the holding time t1 has reached or exceeded a previously defined limit holding time T1 (step 12 ). If the test result is negative, the position of the switch operating element (step 10 ) and the holding time t1 (step 12 ) at regular intervals (break 13 ) repeated. If the test result is positive, a multiple shift operation desired by the driver is present. As a result, the shift mode is changed to "multiple shift" (step 14 ).

Subsequently, a sequence branch, which is traversed a number of times depending on the number of individual circuits of the multiple switching operation, starts once less than the number of individual circuits due to the first individual switching performed in advance. First, a time measurement of a switch waiting time t2 starts (step 15 ). Subsequently, it is checked whether the switching waiting time t2 has reached or exceeded a predetermined switching interval T2 (step 16 ). If the result of the test is negative, the latter step will be taken at regular intervals (Pause 17 ) repeated. The shift interval T2 is used to adapt the vehicle speed and the engine speed to the next individual circuit and thus to increase the ride comfort and to reduce wear on the switching elements. Subsequently, an operational safety check is performed again (step 18 ). If the test result is negative, the operational safety check is carried out at regular intervals (Pause 19 ), taking the break 19 may also include a time count of an adaptation time t3, which is started in a first-time prevented individual circuit and leads to a termination of the multiple switching operation with the achievement of a predetermined limit adjustment time T3. If the test result is positive, the next single switching of the multiple switching operation is performed (step 20 ). Subsequently, it is again checked whether the switching operating element is still in the switching position (step 21 ). In the case of a positive test result, ie with the switching operating element still held in the switching position, the switching delay t2 (step 15 ) branched back. In the case of a negative test result, ie with the shift operating element now released by the driver, the manual shift operation, which in the present case is a multiple shift operation, is ended (step 11 ) and returned to the beginning, in preparation for the next manual circuit trip, the shift mode in step 2 is reset to "single switching operation".

through of the method according to the invention can a driver now a multiple shift now by a permanent Posture of existing switching control elements in a switching position trigger. Apart from the first single circuit, the permissible operating parameters spontaneously to the initial Reaching the switching position is triggered and carried out by the switching operating element, become the other individual circuits of the multiple switching operation, depending on the operating parameters of the motor vehicle, automatically triggered and performed. Thereby on the one hand results in the fastest possible sequence of individual circuits. On the other hand, the driver of a multiple operation of Switching control element freed and can better on the outside traffic focus.

t1

hold time

T1

Limit hold time

t2

Switching delay

T2

switching pause

t3

adjustment time

T3

Border adjustment time

Claims (18)

Method for switching control of an automated motor vehicle transmission, wherein in a manual operating mode, a switching operation is manually triggered by a driver by operating a shift operating element from a neutral position to a shift position, characterized in that a holding time t1 of the shift operating element is determined in the shift position, and that a switching mode of the motor vehicle transmission changes depending on the length of the holding time t1 between a single shift at a shorter holding time and a multiple shift at a longer holding time, wherein in a single shift a single shift is performed with a single change of gear and a multiple switching operation several consecutive individual circuits each carried out with a rectified change of gear ratio. Method according to claim 1, characterized in that that first the switching mode "single switching operation" is activated, and that with the reaching of the switching position by the switching operating element a first individual circuit is triggered and performed. Method according to claim 1 or 2, characterized that with the reaching of the switching position by the switching operating element a time counting The holding time t1 starts, and that with reaching an advance fixed limit holding time T1, the switching mode is changed to "multiple switching". Method according to one of claims 1 to 3, characterized that between the individual circuits of a multiple switching operation in each case a switching pause T2 is provided. Method according to claim 4, characterized in that that with the beginning of the implementation a single circuit a time count a switch waiting time t2 begins, and that with the achievement of the switching pause T2 the next Single circuit initiated and carried out. Method according to claim 4, characterized in that that with the end of the implementation a single circuit a time count a switch waiting time t2 begins, and that with the achievement of the switching pause T2 the next Single circuit initiated and carried out. Method according to one of claims 4 to 6, characterized that a predetermined and stored time constant as Break P2 is used. Method according to claim 7, characterized in that that one of several different stored time constants dependent on selected from operating parameters and is used as a switching pause T2. Method according to claim 8, characterized in that that the selection of the time constants as a function of the switching direction the subsequent individual circuit takes place. Method according to claim 8 or 9, characterized that the selection of the time constants as a function of the translation jump between the two gear stages of the subsequent individual circuit he follows. Method according to one of claims 8 to 10, characterized that the selection of the time constants as a function of the active transmission control mode (Eco, comfort, sport). Method according to one of claims 7 to 11, characterized that the current driving dynamics is detected, and that the current Time constant adapted to the current driving dynamics and the like adapted time constant is used as the switching interval T2. Method according to one of Claims 4 to 12, characterized that with a time constant of 0 or a switching pause of T2 = 0 in the following individual circuit, depending on the switching direction, in the smallest possible or the highest possible gear ratio is switched. Method according to one of claims 1 to 13, characterized that before performing every single circuit an operational safety check is carried out, and that with a positive test result the individual circuit is enabled and performed, whereas at a negative test result the individual circuit is prevented. Method according to claim 14, characterized in that that with a prevented individual circuit the operational safety check in repeated at regular intervals and possibly the relevant individual circuit is enabled and performed. Method according to claim 14 or 15, characterized that at a first-time prevented individual circuit, a time counting a Adjustment time t3 is started, and that with the achievement of a predetermined limit adjustment time T3 of the multiple switching operation ended and returned to the switching mode "single switching operation" becomes. Method according to one of claims 1 to 16, characterized that the multiple switching operation with the leaving the switching position by the switching operating element is terminated and returned to the switching mode "single circuit operation" becomes. Device according to claim 17, characterized in that at the completion of the multiple switching operation, a single circuit in execution still performed becomes.