DE10230651A1 - Automobile clutch coupled to rev regulator for regulation of engine revs in dependence on detected clutch slip - Google Patents

Abstract

The clutch has an element for detecting the disengaged, slip and engaged clutch positions, e.g. by cooperation with the clutch operating device and which is electrically coupled to a rev regulator, for regulation of the engine revs. An Independent claim for a method for regulation of engine revs via a rev regulator in dependence on clutch slip in an automobile is also included.

Description

The invention relates to a clutch for motor vehicles with a Speed controller for regulating the engine speed is electrically connected, as well as a Method for regulating the engine speed using a speed controller in Dependence on the slip of a clutch.

Couplings of the type mentioned are known, in particular those which are operated via a clutch pedal. In motor vehicles with Such clutches are the speed controller according to the prior art Coordinated that he with both when stationary, at idle and when starting Idle speed, that is, when the accelerator pedal is not pressed, as well as when Driving z. B. in first or second gear with the same parameter set is operated. This means that the P and I components of the speed controller for the mentioned situations are the same. The P and I components are off Stability limits. This is mainly due to the so-called Jerk frequency caused, which is about 3 Hz in first gear. If the P- If the proportion is too heavily weighted, the jerk frequency when driving with Idle speed can be excited. If the I component is weighted too strongly, comes it very easy to saw the idle speed. When starting with the Idle speed can now cause the problem that the clutch pedal only can be operated very slowly without stalling the engine. this will subjectively assessed by the driver as "poorly accessible".

Based on this prior art, the object of the invention based on a clutch with improved starting behavior at the Idle speed, d. H. when the accelerator pedal is not pressed.

This object is achieved by a coupling of the beginning mentioned type in such a way that the clutch is an element for Detecting the clutch states "Open", "Slipping", "Closed", that is electrically connected to the speed controller.

In an embodiment of the invention there is an actuating means on the coupling attached, its actuation by the element for detecting the Coupling states can be seen. The actuating means is expediently a Clutch pedal, and is the element for detecting the clutch states a button, which is arranged in a position on the clutch pedal in which button only triggers a signal when the clutch is secure slips, which means that there is no liability.

By attaching a button to the clutch pedal can be recognized at any time whether the clutch pedal is operated or not. The position of the The button is selected so that it only triggers as soon as the clutch continues slips, this is the case when the friction, hysteresis and the games in the transmission from the clutch pedal to the release bearing itself impact more. As long as the button is not activated, this means that the Clutch sticks or is closed. Conversely, the clutch slips when the button is pressed.

In one variant of the inventive idea, an approximate determination is made of the slippage in the clutch characterized in that means are present which, the engine speed and the actual vehicle speed detected _is v, a calculated based on the engine speed and the overall transmission ratio of the differential and gear theoretical vehicle speed _theor v with the Compare the actual vehicle speed v _ist and for all gears for which v _ist <k * v _theor , with k <1, determine that the clutch is _slipping and in this case regulate the speed controller with a parameter set that does not differ from the parameter set slipping clutch differs.

In an embodiment of the invention, the detected actual vehicle _speed must be at least 5% and up to 10% _lower than the theoretical vehicle _speed v _theor to determine a slipping clutch.

For the estimation, the clutch slips when v _is <kv _theor for all gears, where k <1, namely 0.95 to 0.90. This k value thus results in a 5 to 10% safety reserve.

In one embodiment of the invention, the clutch drives when the clutch slips Speed controller a parameter set that is tuned to an open drive train that only includes the motor and the clutch disc.

The further design of the clutch results from the features of Claims 7 to 9.

A method for regulating the engine speed using a speed controller in Dependency on the slip of a clutch for motor vehicles becomes apparent from the fact that the condition of the clutch, whether open, slipping or is closed, determined and the speed controller with open or slipping clutch is operated with a first P and a first I component and with clutch closed with a second P- and / or a second I- Share is operated.

In an embodiment of the method, the second P and / or the second I component higher than the first P and / or I component and is based on the closed one Powertrain that includes all drive elements from the engine to the tires Voted.

The further configuration of the method according to the invention results from the measures of claims 12 to 14.

With the invention, the advantage is achieved that starting at idle, ie. H. without actuating the accelerator pedal, is improved since from the time at which the clutch changes from slipping or slipping to the state of detention another control parameter set is switched.

When examining the behavior of the control loop for the engine speed at opened clutch was surprisingly found that in this case the Stability reserve is higher; probably because in this case the above mentioned jerk frequency does not matter. In this case, the P- or the I component are weighted more heavily. To still drive with Speed controller at idle with the clutch fully closed a stable one To ensure the behavior of the control loop, it is advantageous from the Point in time from which the coupling of loops or slips sticks, to switch to another controller parameter set. From this point in time So is from an "open drivetrain" that only the engine and the Clutch disc includes, on a "closed drivetrain", all Includes drive elements from the engine to the tires. As long as the clutch slips, i.e. when starting, the speed controller can idle be operated with the parameter set for the open drive train. For switching from sliding to holding is the detection of the Coupling condition required in order to access the controller parameter set for the to switch the closed drive train.

An embodiment of the clutch according to the invention is characterized by this that the clutch has an actuating means, preferably a Clutch pedal, and that the means for detecting the clutch conditions is connected to this actuator. This means is, for example Button that can be operated via the clutch pedal.

In a further preferred embodiment, the means for Detecting the clutch conditions Means for detecting the engine speed and the Motor vehicle speed. These are with the speed controller electrically connected. The speed controller with the parameter set for a open or slipping clutch operated. For this, the Engine speed and the current gear ratio a theoretical Vehicle speed calculated and with the detected, actual Vehicle speed compared. The "loop" or "open" state will last for so long the clutch detects when the actual vehicle speed is lower than the theoretical vehicle speed.

An exemplary representation of such means for actuating a clutch and other elements or sensors in a motor vehicle and their Interaction with an electronic control or a controller is in the Documents DE 40 11 850 A1 and DE 44 26 260 A1 are disclosed. Both Documents, as well as on EP 1018606 A2, will be used in this context expressly referred.

To the condition of the sliding clutch with some certainty detect, this state is determined as given when the actual speed by at least 5%, preferably at least Is 10% less than the theoretical vehicle speed.

In a further preferred embodiment, means for detecting the Actuation of the fuel metering member available and with the Speed controller connectable. The speed controller is interconnected or programmed that the first P and the first I component can only be set if it is detected that the fuel metering member is not actuated.

The invention is described below using an exemplary embodiment explained in more detail. This is not a limitation in any way intended.

Using a button attached to the clutch pedal, the Operation of the clutch pedal and slipping of the clutch are detected. The position of the button is selected so that it only triggers when the Clutch slips securely, which means friction, hysteresis and play in the Transmission from the clutch pedal to the release bearing no longer occurs impact. This in turn means that the clutch is slipping or slipping is viewed as long as the button triggers a signal by which the Controller parameter set for the open drive train the speed controller is actuated.

Another possibility for an approximate determination of the Slipping of the clutch consists of that for the engine control existing engine speed and the resulting vehicle speed perform a "worst case" assessment as in the following example is described.

example

The engine speed when idling is n _LL = 800 l / min. If you drive in 1st gear with the clutch closed with n _LL , the result is a theoretical vehicle _speed v _{theor 1} = (n _LL / i ₁ ) with a total transmission ratio i ₁ = 12 (differential and gearbox) and a rolling radius r = 0.2 m r.2.π 60 = 5 km / h. In 2nd gear at i ₂ = 8 there is a vehicle _speed v _{theor 2} = 7.5 km / h. The vehicle speed is correspondingly higher in the higher gears. If the actually measured speed is now less than z. B. v _{theor 1} , it means that the clutch slips. If there is no information about the gear engaged, the worst case scenario is that the clutch slips when the actual speed v _{eff is lower} than the theoretical speed v _{theor 1} for all gears, ie v _theor ≤ kv _{theor 1} with k <1 as safety _reserve . For example, the clutch slips according to this estimate as long as v _eff ≤ 4.5 km / h for k = 0.9, i.e. a 10% safety reserve is provided. Furthermore, the current actual idling speed in the specified formula is used to detect the clutch state at this point in time at which the current values are sampled by the control electronics, which automatically takes into account the brief drop in engine speed during the starting process.

By detecting the slipping clutch, the speed controller is operated in idle with a parameter set that is matched to the open drive train. The P and I components are weighted accordingly higher, which ensures a better start. If the condition for the slipping clutch is no longer fulfilled, ie v _eff > 4.5 km / h or the button is no longer active, which can be the case when the engine is running at idling speed, the speed controller is switched to the closed drive train tuned controller parameter set operated to ensure the stability of the start.

The claims filed with the application are Proposed wording without prejudice for obtaining further patent protection. The The applicant reserves the right to add more, so far only in the description and / or To claim drawings disclosed combination of features.

Relationships used in subclaims point to the others Training the subject of the main claim by the features of respective subclaim; they are not considered a waiver of achieving one independent, objective protection for the combinations of features of to understand related subclaims.

Since the subjects of the subclaims with regard to the prior art reserves the right to make its own and independent inventions on the priority day Applicant before becoming the subject of independent claims or To make divisional declarations. You can continue to work independently Inventions contain one of the objects of the previous Have independent claims independent design.

The exemplary embodiments are not intended to limit the invention understand. Rather, there are numerous within the scope of the present disclosure Changes and modifications possible, especially such variants, elements and combinations and / or materials, for example by combination or modification of individual in connection with that in general Description and embodiments as well as the claims described and in features or elements contained in the drawings or Process steps for the person skilled in the art with regard to solving the problem can be found and through combinable features to a new item or new ones Lead process steps or process step sequences, also insofar as they Test and work procedures concern.

Claims (14)

1. Clutch for motor vehicles, which is electrically connected to a speed controller for regulating the engine speed, characterized in that the clutch has an element for detecting the clutch states "open", "slipping", "closed", which is electrically connected to the speed controller , 2. Coupling according to claim 1, characterized in that on the Coupling an actuator is attached, the actuation by the Element for detecting the clutch states is recognizable. 3. Coupling according to claim 1 or 2, characterized in that the Actuating means is a clutch pedal and the element for Detecting the clutch conditions is a button that is in a position on the Clutch pedal is arranged in which the button sends a signal only triggers when the clutch slips safely. 4. Coupling for motor vehicles, which is electrically connected to a speed controller for regulating the engine speed, characterized in that means are present which detect the engine speed and the actual vehicle speed v _ist , one based on the engine speed and the overall gear ratio of differential and transmission _{Compare the} calculated theoretical vehicle _speed v _theor with the actual vehicle speed v _ist and for all gears for which v _ist <kv _theor , with k <1, determine that the clutch is _slipping and in this case regulate the speed controller with a parameter set that _adjusts itself differs from the parameter set when the clutch is not slipping. 5. Coupling according to claim 4, characterized in that the detected vehicle _speed v _is at least 5% and up to 10% _lower than the theoretical vehicle _speed v _theor to determine a slipping clutch. 6. Coupling according to one of claims 1 to 5, characterized in that that if the clutch slips, the speed controller has a parameter set drives that is tuned to an open drivetrain that only the Includes engine and clutch disc. 7. Coupling according to one of claims 1 to 6, characterized in that that the speed controller has an adjustable P and I component and can be regulated so that it detects "slipping" or "open" when the condition is detected the clutch can be operated with an adjustable first P and I component, and when the "closed" state of the clutch is detected with a adjustable second P and I portion is operable. 8. Coupling according to claim 7, characterized in that the speed controller is controllable in such a way that the theoretical speed v _theor calculated from the engine speed and the gear ratio _is compared with the detected actual vehicle speed v _ist and from the comparison the state "slip" or "Open" of the clutch is detectable as applicable if the detected actual vehicle _speed v _is smaller than the theoretical vehicle _speed v _theor . 9. Coupling according to one of claims 1 to 8, characterized in that the speed controller is regulated so that it is connected to the second P and the second I component can be operated when it is detected that the actual Vehicle speed v> 4.5 km / h or the element for detection the clutch status is not active. 10. Method for regulating the engine speed using a speed controller in Dependence on the slip of a clutch for motor vehicles, thereby characterized that the condition of the clutch, whether open, slipping or is determined closed and the speed controller with open or slipping clutch with a first P and a first I component is operated and with the clutch closed with a second P- and / or a second I component is operated. 11. The method according to claim 10, characterized in that the second P and / or the second I component is higher than the first P and / or I share and on the closed drivetrain that all Includes drive elements from the engine to the tires of the motor vehicle, is coordinated. 12. The method according to claim 10, characterized in that the Speed controller is operated with the first P and / or I component, if that Element for detecting the clutch states is active. 13. The method according to any one of claims 10 to 12, characterized in that that the clutch states by detecting an operation of the Clutch pedals are detected. 14. The method according to any one of claims 10 to 12, characterized in that the clutch conditions by detecting clutch slip can be detected.