Methods and systems for operating a driveline that includes a dual clutch transmission are described. In one example, clutches of the dual clutch transmission may be cooled via activating and adjusting a flow rate of an electric pump. Further, driveline operating modes may be entered or exited in response to clutch operating conditions so that driveline robustness may be enhanced.

Disclosed are a method of controlling a transmission for reducing clutch abrasion and an automatic transmission controlled by the method. The method is applied to a hybrid vehicle, and controls an automatic transmission having an independent flow control valve and an engine clutch cooling channel for the cooling of an engine clutch mounted thereon. The method includes a hybrid starter generator (HSG) state determination step of determining a state of an HSG, a driving motor cranking execution step of cranking an engine using a driving motor when the state of the HSG is a state in which the HSG does not operate in the HSG state determination step, and a cooling execution step of supplying an additional flow to the engine clutch cooling channel by driving the independent flow control valve, wherein the cooling execution step is performed simultaneously with the driving motor cranking execution step.

Methods and systems are provided for operating a driveline of a hybrid vehicle that includes an internal combustion engine, an electric machine, and a transmission are described. In one example, values of an engine spark to engine torque relationship are adjusted to improve engine torque control. The engine is subsequently operated responsive to adjusted values of the engine spark to engine torque relationship.

A control apparatus of an automatic transmission including a plurality of planetary gear mechanisms and engaging mechanisms configured to establish a gear range by switching inputs/outputs of the plurality of planetary gear mechanisms, comprises an oil pressure supply device which supplies an oil pressure to operate the engaging mechanisms between an engaging state and a release state in which the engaging state is canceled; and a gear change controller which controls an operation state of each of the engaging mechanisms of the planetary gear mechanisms to establish one gear range of a plurality of gear ranges. The gear change controller executes gear change control of restricting the gear change to the gear range in a case in which the temperature of each of the engaging mechanisms in the gear range after the gear change is predicted to be not less than an allowable temperature.

A method is provided for balancing clutch wear in a dual clutch transmission. The method involves performing the steps of determining which clutch unit of first and second clutch units is subjected to the most accumulated wear and selecting a gear actuated by the other clutch unit during launch of the vehicle.

Disclosed are a method of controlling a transmission for reducing clutch abrasion and an automatic transmission controlled by the method. The method is applied to a hybrid vehicle, and controls an automatic transmission having an independent flow control valve and an engine clutch cooling channel for the cooling of an engine clutch mounted thereon. The method includes a hybrid starter generator (HSG) state determination step of determining a state of an HSG, a driving motor cranking execution step of cranking an engine using a driving motor when the state of the HSG is a state in which the HSG does not operate in the HSG state determination step, and a cooling execution step of supplying an additional flow to the engine clutch cooling channel by driving the independent flow control valve, wherein the cooling execution step is performed simultaneously with the driving motor cranking execution step.

When an engagement-side clutch taking charge of rotation control in an upshift is the same as a rotation control clutch of a previous gear shift, it is determined that there is a likelihood that a thermal load of a clutch friction material will increase, and the thermal load of the clutch friction material is decreased by delaying gear shift start. By setting a delay time by which the gear shift start is delayed when an accelerator depression amount is small to be shorter than when the accelerator depression amount is large depending on the accelerator depression amount, a gear shift which is an upshift can be performed without unnecessary waiting.

Methods and systems are provided for operating a driveline of a hybrid vehicle that includes an internal combustion engine, an electric machine, and a transmission are described. In one example, values of an engine spark to engine torque relationship are adjusted to improve engine torque control. The engine is subsequently operated responsive to adjusted values of the engine spark to engine torque relationship.

A control apparatus of an automatic transmission including a plurality of planetary gear mechanisms and engaging mechanisms configured to establish a gear range by switching inputs/outputs of the plurality of planetary gear mechanisms, comprises an oil pressure supply device which supplies an oil pressure to operate the engaging mechanisms between an engaging state and a release state in which the engaging state is canceled; and a gear change controller which controls an operation state of each of the engaging mechanisms of the planetary gear mechanisms to establish one gear range of a plurality of gear ranges. The gear change controller executes gear change control of restricting the gear change to the gear range in a case in which the temperature of each of the engaging mechanisms in the gear range after the gear change is predicted to be not less than an allowable temperature.

Methods and systems for operating a driveline that includes a dual clutch transmission are described. In one example, clutches of the dual clutch transmission may be cooled via activating and adjusting a flow rate of an electric pump. Further, driveline operating modes may be entered or exited in response to clutch operating conditions so that driveline robustness may be enhanced.