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  Control device of automatic transmissionUSPTO Application #: 20060195243Title: Control device of automatic transmission Abstract: When a request to switch to a shift to a new third shift step is made during performing a shift from a first shift step to a second shift step, a method of performing the shift to the third shift step is changed according to an engagement pattern of respective friction engaging components in a steady state of the third shift step. When there are the friction engaging components that are continuously being engaged or disengaged at the time of a shift from the second shift step to the third shift step, the friction engaging components are continuously engaged or disengaged whereas the control of engaging or disengaging the other friction engaging components that are to be changed in the state of engagement or disengagement is started so as to make the other friction engaging components respond to the engagement pattern of the third shift step. (end of abstract) Agent: Nixon & Vanderhye, PC - Arlington, VA, US Inventor: Masaru Suzuki USPTO Applicaton #: 20060195243 - Class: 701051000 (USPTO) Related Patent Categories: Data Processing: Vehicles, Navigation, And Relative Location, Vehicle Control, Guidance, Operation, Or Indication, Transmission Control The Patent Description & Claims data below is from USPTO Patent Application 20060195243. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATION [0001] This application is based on Japanese Patent Application No. 2005-52264 filed on Feb. 28, 2005, the disclosure of which is incorporated herein by reference. FIELD OF THE INVENTION [0002] The present invention relates to a control device of an automatic transmission provided with the function of performing multiple shift control when a request to switch to a new shift step is made during the operation of switching a shift step of an automatic transmission. BACKGROUND OF THE INVENTION [0003] In an automatic transmission for an automobile, the power of an engine is transmitted to the input shaft of a transmission mechanism via a torque converter and the rotation of this input shaft is varied and is transmitted to an output shaft thereof by this transmission mechanism to rotate and drive a driving wheel. In the commonest transmission mechanism, a plurality of gears are arranged between the input shaft and the output shaft to construct a plurality of power transmission paths of different transmission gear ratios between the input shaft and the output shaft and friction engaging components of clutches and brakes are mounted in the respective power transmission paths. By individually controlling hydraulic pressures applied to the respective friction engaging components according to a request to switch a shift step, the filling control of filling specified friction engaging components with hydraulic oil and the draining control of draining the hydraulic oil from specified friction engaging components is performed to selectively switch between engagement and disengagement of the respective friction engaging components to switch the power transmission paths between the input shaft and the output shaft to thereby switch a transmission gear ratio. [0004] In this automatic transmission, when a request to switch to a new shift step is made during the operation of switching a shift step and a target shift step is changed, the multiple shift control of switching a shift step of the transmission mechanism to the target shift step after shift change is performed. For example, the following case is assumed; the filling control of filling the cylinder of a clutch or the like with hydraulic oil is being performed and the filling control is switched in the process of the filling control to the draining control of draining the hydraulic oil by the change of a target shift step and then the draining control is again switched in the process of the draining control to the filling control by the change of a target shift step. In this case, depending on a state where the hydraulic oil is drained from the cylinder by the draining control before shift change, there is a possibility that when the cylinder is again filled with the hydraulic oil, the cylinder is excessively filled with the hydraulic oil to suddenly increase a force for engaging the clutch to cause a shift shock. [0005] As a technology for preventing the shift shock caused by this multiple shift, for example, as disclosed in Japanese Patent No. 32919790, there is proposed a technology that when a request to switch to a second shift step is made during the operation of switching to a first shift step, the operation of switching to the second shift step is delayed until the operation of switching to the first shift step is finished. [0006] However, the operation of switching to the second shift step is delayed until the operation of switching to the first shift-step is finished and hence it takes a long time before the operation of switching to the second shift step is finished. SUMMARY OF THE INVENTION [0007] The present invention has been made in consideration of such circumstances. Therefore, the object of the present invention is to provide such a control device of an automatic transmission that can prevent a shift shock caused by a multiple shift and at the same time can perform a multiple shift with excellent responsivity. [0008] To achieve the above-mentioned object, the present invention is such a control device of an automatic transmission that includes multiple shift controlling means which switches the controlling state of hydraulic pressure applied to respective friction engaging components to perform a multiple shift when a request to switch to a shift to a new third shift step is made during performing a shift from a first shift step to a second shift step. A method for shifting to the third shift step is changed according to a combination pattern of engagement and disengagement (hereinafter referred to as "engagement pattern") of the respective friction engaging components in the steady state of the third shift step. When a request to switch to a shift to a new third shift step is made during performing a shift from a first shift step to a second shift step, it is possible to select an appropriate shifting method and to perform a multiple shift in consideration of the relationship between the engagement pattern of the respective friction engaging components at that time. Hence, it is possible to restrict a shift shock caused by a multiple shift and at the same time to perform a multiple shift with excellent responsivity. BRIEF DESCRIPTION OF THE DRAWINGS [0009] FIG. 1 is a general schematic construction diagram of an automatic transmission in one embodiment of the present invention. [0010] FIG. 2 is a diagram showing a combination of engagement and disengagement of clutches C0 to C2 and brakes B0 to B3 for respective shift steps. [0011] FIG. 3 is a graph showing one example of a shift pattern. [0012] FIG. 4 is a time chart showing a control example (shift change) when a request to switch a shift to a third speed is made during performing a shift from a fifth speed to a fourth speed. [0013] FIG. 5 is a time chart showing a control example (shift cancellation) when a request to switch a shift to a fifth speed is made during performing the shift from the fifth speed to the fourth speed. [0014] FIG. 6 is a time chart showing a control example (continuous shift preparation) when a request to switch a shift to a second speed is made during performing a shift from the fourth speed to the third speed. [0015] FIG. 7 is a time chart showing a control example (continuous shift preparation) when a request to switch a shift to the third speed is made after a change in the rotational speed of an input shaft is started during performing the shift from the fifth speed to the fourth speed. [0016] FIG. 8 is a flow chart showing the flow of processing of a routine for controlling a shift. [0017] FIG. 9 is a flow chart showing the flow of processing of a routine for setting a target shift step and a shift performance state. [0018] FIG. 10 is a flow chart showing the flow of processing of a routine for determining and setting a multiple shift. [0019] FIG. 11 is a flow chart showing the flow of processing of a routine for determining multiple shift allowance. Continue reading... Full patent description for Control device of automatic transmission Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Control device of automatic transmission patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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