Motor vehicle
AssigneeLuK Getriebe-Systeme GmbH
InventorOliver Amendt
Life of this patent
Estimating the term…
Abstract
A clutch touch point control system for an automatically actuated clutch includes a determination method of comparing a torque load on the engine and a torque output from the clutch. A correction of the point of engagement is performed when the two values of torque differ by a predetermined amount. The determination of the torque values is averaged over a relatively long period of time in order to reduce the effect of temporary changes due to heating of the clutch linings, etc.
Claims72
A system for automatically regulating the transmission of torque in a torque transmitting system, such as a clutch, by determining an engagement point at which said clutch begins to transmit torque, said system comprising:
- means for selecting a clutch torque to be a first predetermined clutch torque, which can be ascertained based on a stored value of an operating point and a characteristic curve of the clutch;
- means for measuring values of a parameter representing engine torque in a first phase, such values being optionally averaged;
- means for selecting the clutch torque to be a second predetermined clutch torque in a further phase;
- means for measuring values of a parameter representing engine torque in said further phase, such values being optionally averaged;
- means for comparing the first and second clutch torques and the parameter values in the first and second phases representing engine torque;
- means for determining whether a difference between said engine torques and said clutch torques exceeds a preselected limit value;
- means for altering a stored value of the engagement point in dependence on the difference between said engine torques and said clutch torques.
In a motor vehicle, the combination of a driving unit, a transmission, a torque transmitting system, such as a friction clutch, and a central control unit which is connected in a signal-transmitting manner with at least one sensor and which controls the torque adapted to be transmitted by the torque transmitting system in dependency upon the operating point or as a function of time, the operating point which denotes the position of engagement at a time when the transmission of torque begins is adapted in such a way that at least one set of data denoting the engagement point and being utilized by the control unit and being stored in at least one memory is caused to at least approximate, at least in a stepwise fashion, the at least one physical engagement point.
In a motor vehicle, the combination of a driving unit, a transmission, an automated torque transmitting system, such as a friction clutch, a central control unit as well as at least one adjusting member which is actuatable by the control unit which serves to select the torque to be transmitted by the torque transmitting system, the torque to be transmitted by the torque transmitting system being selectable within a range between a fully disengaged position in which the transmissible torque equals zero and a fully engaged position in which the transmissible torque assumes a maximum value, wherein the physically existing engagement point which characterizes the position of engagement at the onset of torque transmission, is compared on the basis of a planned regulation by the control unit as a function of time or in dependency upon the operating point with at least one set of data pertaining to the engagement point and being stored in a memory, and the set of data is adapted, at least stepwise, in the event of departures of the physical engagement point from the set of data denoting the engagement point.
In a motor vehicle, the combination of a driving unit, a transmission, an automated torque transmitting system, such as a friction clutch, a central control unit as well as at least one adjusting member which is actuatable by the control unit and serves to select the torque to be transmitted by the torque transmitting unit, the torque to be transmitted by the torque transmitting system being selectable within a range between a fully disengaged position in which the transmissible torque equals zero and a fully engaged position in which the transmissible torque assumes a maximum value, wherein the engagement point is adapted in accordance with at least one of the following criteria:
- an adaptation of the engagement point on the basis of long-range variations of the engagement point as a result of developing changes in the power train or in the torque transmitting system;
- an adaptation of the engagement point on the basis of changes of the engagement point as a result of short-lasting changes in the power train or in the torque transmitting system.
A method of automatically regulating the transmission of torque in a torque transmitting system, such as a clutch, by determining an engagement point at which said clutch begins to transmit torque, the method comprising the following steps:
- (a) the clutch torque is selected for a preselectable position of the clutch or at a preselectable desired clutch torque;
- (b) in a first phase measurement values are taken of a parameter which denotes the engine torque, such values being adapted to be averaged if desired or necessary;
- (c) a predeterminable position of the clutch or a predeterminable desired clutch torque is selected in a second phase;
- (d) measurement values denoting a parameter which is indicative of the engine torque are ascertained and, if desired or necessary, averaged in a third phase;
- (e) a comparison is carried out at least between the values referred to in the steps (a) and (c) and denoting the engine torque, and the values of the desired clutch torque;
- and
- (f) the monitored engagement point is altered in dependency upon the above steps.
A method of automatically regulating the transmission of torque in a torque transmitting system, such as a clutch, by determining an engagement point at which said clutch begins to transmit torque, the method comprising the following steps:
- (a) the clutch torque is selected in a preselectable ascertained clutch position or at a predeterminable selected desired clutch torque, which can be ascertained on the basis of the stored value of the operating point and of a characteristic curve of the clutch,
- (b) measurement values of a parameter representing a clutch torque are ascertained in a preselectable time window, such values being averaged if necessary or desired,
- (c) a further predeterminable desired clutch torque is selected in a further phase,
- (d) measurement values of a parameter denoting the engine torque are ascertained in a further phase and are averaged, if necessary or desired,
- (e) a comparison is carried out at least between those values of the steps (b) and (d) which denote the engine torque and the values denoting the desired clutch torques of the steps (a) and (c),
- (f) an evaluation is made whether or not a difference between at least one engine torque and at least one desired clutch torque exceeds a preselectable limit value, and
- (g) the stored value of the engagement point is altered, if necessary, in dependency upon the comparison or in dependency upon the extent of the departure.
A system for automatically regulating the transmission of torque in a torque transmitting system, such as a clutch, by determining an engagement point at which said clutch begins to transmit torque, said system comprising:
- means for selecting a clutch torque to be a first predetermined clutch torque, which can be ascertained based on a stored value of an operating point and a characteristic curve of the clutch;
- means for measuring values of a parameter representing engine torque in a first phase, such values being optionally averaged;
- means for selecting the clutch torque to be a second predetermined clutch torque in a further phase;
- means for measuring values of a parameter representing engine torque in said further phase, such values being optionally averaged;
- means for comparing the first and second clutch torques and the parameter values in the first and second phases representing engine torque;
- means for altering the engagement point by incrementing/decrementing said engagement point and storing said altered engagement point and utilizing said system to iteratively alter said engagement point if a difference between said first and second clutch torques and the parameter values in the first and second phases exceeds a predetermined limit.
A method of automatically regulating the transmission of torque in a torque transmitting system, such as a clutch, by determining an engagement point at which said clutch begins to transmit torque, the method comprising the following steps:
- (a) the clutch torque is selected in a preselectable clutch position or at a preselectable clutch torque;
- (b) the measurement values of a parameter denoting the engine torque are determined, and averaged if necessary or desired, in a first phase;
- (c) a predeterminable clutch position or a predeterminable desired clutch torque is set in a second phase;
- (d) measured values of a parameter denoting the engine torque are ascertained and, if necessary or desired, averaged in a third phase;
- (e) and a comparison is carried out between those values of the steps (a) and (c) which denote the values of the engine torque and the values of the desired clutch torques, and
- (f) the engagement point is incrementally/decrementally altered and stored, and the procedure is carried out anew from the step (a), when the comparison indicates a difference which departs from a predeterminable tolerance.
A system for automatically regulating the transmission of torque in a torque transmitting system, such as a clutch, by determining an engagement point at which said clutch begins to transmit torque, said system comprising:
- means for selecting a clutch torque to be a first predetermined clutch torque, which can be ascertained based on a stored value of an operating point and a characteristic curve of the clutch;
- means for measuring values of a parameter representing engine torque in a first phase, such values being optionally averaged;
- means for selecting the clutch torque to be a second predetermined clutch torque in a further phase;
- means for measuring values of a parameter representing engine torque in said further phase, such values being optionally averaged;
- means for comparing the first and second clutch torques and the parameter values in the first and second phases representing engine torque;
- means for altering the engagement point by incrementing/decrementing said engagement point and storing said altered engagement point and utilizing said system to iteratively alter said engagement point using said first clutch torque and said first phase parameter values and a new second clutch torque and a new second phase parameter value if a difference between said first and second clutch torques and the parameter values in the first and second phases exceeds a predetermined limit.
A method of automatically regulating the transmission of torque in a torque transmitting system, such as a clutch, by determining an engagement point at which said clutch begins to transmit torque, the method comprising the following steps:
- (a) the clutch torque is selected in a preselectable position of the clutch or at least at one preselectable desired clutch torque;
- (b) measurement values of a parameter denoting the engine torque are determined and, if necessary or desired, averaged in a first phase;
- (c) a predeterminable position of the clutch or a predeterminable desired clutch torque is set in a second phase;
- (d) measurement values of a parameter denoting the engine torque are ascertained and, if necessary or desired, averaged in a third phase;
- (e) and a comparison is carried out between those values of the steps (a) and (c) which denote the engine torque and the values of the desired clutch torque, and
- (f) the engagement point is altered incrementally/decrementally and is stored, and the procedure is carried out anew from the step (c) on, the data of the points (a) and (b) being still utilizable, when the difference departs from a predeterminable tolerance.
A method of automatically regulating the transmission of torque in a torque transmitting system, such as a clutch, by determining an engagement point at which said clutch begins to transmit torque, the method comprising the following steps:
- ascertaining on the basis of values, such as measured values, of a value denoting the engine torque and on the basis of clutch torques, and a difference between the values of the clutch torques is ascertained, and that such differences are compared, and at least one stored value of the engagement point is altered in the event of lack of equality or in dependency upon the departure in response to detection of a lack of equality between the aforementioned differences or when the lack of equality exceeds a predeterminable value.
A method of automatically regulating the transmission of torque in a torque transmitting system, such as a clutch, by determining an engagement point at which said clutch begins to transmit torque, the method comprising the following steps:
- the selection of the clutch torque by the control unit, at least in one operating point, is carried out in accordance with the engagement point to correspond to a predeterminable desired clutch torque at a clutch setting or at a selected clutch torque in such a way that, during a first phase measurement values are taken up denoting a value which represents the engine torque, that such values are averaged if desired or necessary, that such values of the engine torque are thereupon compared with the selected desired clutch torque and, if the departure is greater than a preselectable value, the value of the engagement point is incremented or decremented at least in a stepwise fashion and, thereafter, the procedure is repeated in response to detection of an incremented or decremented value until the departure is smaller than the preselectable value.
A method of automatically regulating the transmission of torque in a torque transmitting system, such as a clutch, by determining an engagement point at which said clutch begins to transmit torque, the method comprising the following steps:
- wherein when the clutch is disengaged and the transmissible torque is disappearing, the engine torque, thereupon the clutch torque are ascertained, such as the transmissible clutch torque, is set to the value of the engagement point plus a desired or required clutch torque, and the engine torque is ascertained and, if the value of a predeterminable difference between the engine torque and the clutch torque is exceeded, the value of the engagement point is increased stepwise and the engine torque is ascertained every time thereafter until the difference between the engine torque and the clutch torque is smaller than the predeterminable difference, and the then existing value of the engagement point is stored.
A method of adapting the engagement point of a torque transmitting system in the power train of a motor vehicle with a control unit and an adjusting member and sensors for the determination of measured values, wherein the setting of the clutch at least at one operating point comprises at least one of the following steps:
- (a) setting of a clutch position at which essentially no torque is being transmitted,
- (b) setting of a clutch position at which a desired clutch torque (M.sub.Ksoll) is to be transmitted,
- (c) determination of measured values which denote the engine torque and/or on the basis of which the engine torque is ascertainable,
- (d) averaging the measured values,
- (e) establishment of a difference between the values of the torque, such as averaged values of the torque,
- (f) comparing the values of the torques, such the values of averaged torques,
- (g) incrementing/decrementing of the at least one stored value of the engagement point.
Dependencies are inferred from the claim text.