Control system for a power train

A control system for a power train having an engine, an automatic transmission, and supercharger means provided in an intake passage of the engine for supplying compressed air into a cylinder of the engine, comprising:

• first detecting means for detecting a demand for adding supercharging power,
• second detecting means for detecting a demand for shifting a gear stage of the automatic transmission,
• control means for controlling the supercharger means and the automatic transmission, said control means including judging means for judging if a demand for adding supercharging power occurs before the automatic transmission completes a shift change operation in response to the first and the second detecting means, and operating means for operating the supercharger means after the automatic transmission has completed a shift change operation in response to an output of the judging means, and
• turbine speed detecting means for detecting a rotational speed of a turbine runner in the automatic transmission, and wherein said operating means judges if a shift change in response to the turbine speed detecting means is completed.

A control system for a power train having an engine, an automatic transmission, mechanical supercharger means provided in an intake passage of the engine and driven by an output shaft of the engine for supplying compressed air into a cylinder of the engine, said mechanical supercharger means including clutch means for connecting the mechanical supercharger means with and disconnecting the mechanical supercharger means from the output shaft of the engine, comprising:

• first detecting means for detecting a demand for engaging the clutch means,
• second detecting means for detecting a demand for shifting a gear stage of the automatic transmission, and
• control means for controlling the clutch means and the automatic transmission, said control means including:
• judging means responsive to the first and the second detecting means for judging if both the demand for engaging the clutch means of the supercharger means and the demand for shifting the gear stage of the automatic transmission occur at the same time, and
• operating means for operating the supercharger means so that the supercharger means is not fully engaged with the engine output shaft, wherein the clutch means is connected with the output shaft of the engine by slipping engagement.