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US 9,500,278 B2Granted
Hydraulic control operation amount generation apparatus for automatic transmission and control apparatus for automatic transmission
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsTakayuki Ando, Masami Kondo, Seiji Masunaga, Shogo Tsuge
Life of this patent
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Abstract
With a hydraulic control operation amount generation apparatus for an automatic transmission and a control apparatus for an automatic transmission, a control operation amount at which any desired target packing control execution time can be realized is generated on a hydraulic model by determining formulae of the 2n−2 constraint conditions corresponding to the n hydraulic control phases relating to the packing control of the engagement devices.
Claims7
A hydraulic control operation amount generation apparatus for an automatic transmission, comprising:
- a plurality of engagement devices, the engagement devices including a piston that operates in response to a pack pressure in a working oil chamber;
- a hydraulic control circuit configured to adjust the pack pressure;
- a transmission ECU configured to
- shift a gear position of the automatic transmission to a target gear position by engaging or disengaging the respective engagement devices in accordance with the target gear position, and
- perform packing control on the basis of a hydraulic model, the packing control being control for setting the engagement devices, which are to be subjected to engagement control, in a standby condition immediately before an engaged condition;
- and
- a control operation amount generation ECU configured to
- calculate a hydraulic model having n hydraulic control phases of the packing control, the n being equal to or more than 2, each hydraulic control phase being constituted by a combination of a hydraulic pressure command value and an output time of the hydraulic pressure command value, and the calculated hydraulic model being a model on which a hydraulic pressure command value of the pack pressure and an output time of the hydraulic pressure command value at which to realize a target execution time of the packing control and a piston stroke end pressure for maintaining the standby condition are determined as control operation amounts,
- generate 2n−1 control operation amounts, the 2n−1 control operation amounts being control operation amounts obtained by excluding an output time of one hydraulic pressure control phase from the 2n control operation amounts of the n hydraulic control phases,
- calculate 2n−2 constraint conditions relating to a degree of packing progress by determining two constraint conditions for each hydraulic control phase from n−1 hydraulic control phases, and
- generate the 2n−1 control operation amounts on the basis of the target execution time, the piston stroke end pressure, and the 2n−2 constraint conditions.
8 more elements
A control apparatus for an automatic transmission, comprising:
- a plurality of engagement devices, the engagement devices including a piston that operates in response to a pack pressure in a working oil chamber;
- a hydraulic control circuit configured to adjust the pack pressure;
- and
- at least one ECU configured to
- (i) shift a gear position of the automatic transmission to a target gear position by engaging or disengaging the respective engagement devices in accordance with the target gear position,
- (ii) perform packing control on the basis of a hydraulic model, the packing control being control for setting the engagement devices, which are to be subjected to engagement control, in a standby condition immediately before an engaged condition,
- (iii) calculate a hydraulic model having n hydraulic control phases of the packing control, the n being equal to or more than 2, each hydraulic control phase being constituted by a combination of a hydraulic pressure command value and an output time of the hydraulic pressure command value, the calculated hydraulic model being a hydraulic model on which a hydraulic pressure command value of the pack pressure and an output time thereof at which to realize a target execution time and a piston stroke end pressure for maintaining the standby condition are determined as control operation amounts,
- (iv) generate 2n−1 control operation amounts by excluding an output time of one hydraulic pressure control phase from the 2n control operation amounts in the n hydraulic control phase;
- and
- (v) calculate 2n−2 constraint conditions relating to a degree of packing progress by determining two constraint conditions for each hydraulic control phase from n−1 hydraulic control phases,
- wherein the 2n−1 control operation amounts are generated on the basis of the target execution time, the piston stroke end pressure, and the 2n−2 constraint conditions.
8 more elements
Dependencies are inferred from the claim text.