Interrelated power delivery controls – including engine control – Transmission control – Engine controlled by transmission
Reexamination Certificate
2001-08-20
2003-06-10
Estremsky, Sherry (Department: 3681)
Interrelated power delivery controls, including engine control
Transmission control
Engine controlled by transmission
C477S078000, C477S109000
Reexamination Certificate
active
06575873
ABSTRACT:
BACKGROUND OF THE INVENTION
Field of the Invention
The present invention relates to a method for driving a drive assembly in a drive system, the drive system having an automatic transmission and an automatic clutch that optionally couples the drive assembly to the transmission in order to transmit torque. The invention also relates to a drive system.
European Patent Application EP 0 695 665 B1, corresponding to U.S. Pat. No. 5,609,545, discloses such a drive system in which a first drive apparatus is assigned to the automatic drive assembly, and a second drive apparatus is assigned to the automatic transmission. These drive apparatuses exchange data and when a gearshift operation occurs, the first drive apparatus drives the drive assembly in such a way that the torque thereof is reduced from a starting value to a region of zero. During this reduction in torque, the control device provides for the automatic transmission any setpoint values that are transmitted to the control device of the drive assembly, which are to drive the drive assembly, in such a way that the deviation between the actual value of the torque and the setpoint value is minimized. However, this procedure does not take into account the fact that, on the one hand, the transmission of data between the two drive apparatuses leads to these values being provided with a delay in the drive device for the drive assembly, and that, moreover, the driving of the drive assembly, which is performed by the drive apparatus for the drive assembly in order to set a specific actual value, also takes place with a specific delay because, in particular, intervention into the throttle system of an internal combustion engine is a comparatively sluggish intervention whose reaction takes place with a certain delay. This leads to a situation in which in this known method or this known system there is a relatively large deviation between the actual torque of the drive assembly and the setpoint value predefined by the drive device for the automatic transmission, with the consequence that the desired gearshift characteristic often can no longer be obtained. German Published, Non-Prosecuted Patent Application DE 197 25 816 A1 discloses a method for driving an automatic torque transmission system in which a drive unit drives the drive assembly by reference to predefined setpoint values, the setpoint values being each determined directly from the operating state or a characteristic diagram during the execution of the gearshift operation. Thus, changing values of the torque are used, for example, as setpoint values of the respective nonspecific increment values or decrement values, the increment or decrement values of variables depending on variables, such as, for example, the pedal value, that is to say the depression of an accelerator pedal, the clutch slip and the like. Because these setpoint values for the torque are generated as a function of the actual operating state, they are available only for a relatively short period so that a specific time is necessary for adjusting the actual torque to the setpoint values which are then respectively predefined, with the consequence that here too an undesired delay occurs. This results in the actual torque following the setpoint torque with a specific delay and having a relatively large deviation from the setpoint torque.
SUMMARY OF THE INVENTION
It is accordingly an object of the invention to provide a drive system and method for driving a drive assembly in a drive system that overcomes the hereinafore-mentioned disadvantages of the heretofore-known devices of this general type and that provides a method for driving a drive assembly or a drive system with which the quality of the engine control can be improved when a gear is shifted.
With the foregoing and other objects in view, there is provided, in accordance with the invention, a method for driving a drive assembly in a drive system. The method includes a first step of providing a drive system having an automatic transmission and an automatic clutch coupling the drive assembly to the automatic transmission for transmitting torque. The next step is sensing if a procedure having time segments is to be conducted. The next step is, after the procedure has been sensed, predefining a prediction profile for an operational variable characterizing an operating state of the drive assembly for at least one time segment of the procedure to be conducted. The next step is driving the drive assembly based on the predefined prediction profile of the operational variable to minimize a deviation between the operational variable and the prediction profile.
With the objects of the invention in view, there is also provided a drive system including a drive assembly, an automatic transmission, and an automatic clutch optionally connecting a torque transmission between the drive assembly and the automatic transmission, a first drive control loop for driving the drive assembly, and a second drive control loop for driving the automatic transmission. When a procedure having time segments is conducted, the second drive control loop predefines, for at least one time segment of the procedure, a prediction profile for an operational variable characterizing an operation of the drive assembly. The first drive control loop drives the drive assembly to set an operational variable based on the prediction profile.
According to a first aspect of the present invention, the object is achieved by a method for driving a drive assembly in a drive system. The drive system includes an automatic transmission and an automatic clutch that optionally couples the drive assembly to the transmission in order to transmit torque, the method includes the following steps:
a) sensing whether a procedure, in particular a gearshift operation, is to be conducted,
b) after it has been sensed that a procedure, in particular a gearshift operation, is to be conducted, predefining a prediction profile for an operational variable which characterizes the operating state of the drive assembly for at least one time segment of the procedure which is to be carried out, and
c) driving the drive assembly on the basis of the predefined prediction profile of the operational variable to minimize a deviation between the operational variable and the prediction profile is minimized.
In the present invention, a specific prediction profile of the operational variable that is to be adjusted is predefined for the drive system so that measures can have already been taken at an early time in order to be able to obtain a desired value of this operational variable at specific times. By reference to this prediction profile, it is therefore possible to perform pre-control, with the consequence that the actual characteristic of the operational variable, which is obtained, for example, during the execution of the gearshift operation has a profile with a significantly smaller deviation from the prediction profile, that is to say than is the case with the actual variable and the setpoint variable of the prior art. Such a procedure with the predefinition of a specific prediction profile can be used for a wide variety of procedures, preferably when shifting gears. Such a procedure also can be an acceleration procedure in which the engine torque is to be changed in a relatively short time by predefining a vehicle driver.
Because the driving states can change during the execution of such procedures, in particular also while shifting gears, for example because the driver actuates the acceleration pedal or a brake pedal during the execution, the prediction profile which is predefined for a specific procedure may no longer be suitable for the operational characteristics present at a given time. In order to be able to take into account such relatively short-term changes in the operational state, it is proposed that the method should also have the following steps:
d) after it has been sensed that a procedure, in particular a shift in gears, predefining at least one setpoint value of the operational variable, and
e) if the at least one setpoin
Carl Ingo
Graf Friedrich
Probst Gregor
Reuthal Rainer
Schneider Hans-Juergen
Estremsky Sherry
Greenberg Lawrence A.
Mayback Gregory L.
Siemens Aktiengesellschaft
Stemer Werner H.
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