Motor vehicle and control method of motor vehicle

Abstract

In response to a downshift operation (step S160) in a moving motor vehicle under an accelerator released state, a torque demand correction value Tα(T) is set to give the greater torque variation against the lower speed in a downshifting gear position and against the higher vehicle speed V, until elapse of a preset time period since the downshift operation (step S180). A torque demand Tr* to be output to a drive shaft of the motor vehicle is updated by adding the torque demand correction value Tα(T) to a previous setting of the torque demand Tr* (step S190). A motor is controlled to decelerate the motor vehicle with the updated torque demand Tr*. The torque variation thus attained is equivalent to a temporary torque variation applied to the drive shaft with a variation in rotation speed of an engine in response to a downshift operation in a conventional motor vehicle equipped with a stepped automatic transmission for torque conversion of the output power of the engine. The arrangement of the invention thus enables the driver of the motor vehicle to have the improved gearshift feeling.

1 . A motor vehicle driven with output power of a motor having power generation capacity, said motor vehicle comprising:
 a control module that sets a deceleration torque demand corresponding to a measured vehicle speed and a detected gearshift position in said motor vehicle moving under an accelerator released state selected by a driver,   in a gearshift position fixing condition where the driver does not change the gearshift position, said control module controlling the motor to decelerate said motor vehicle with the set deceleration torque demand,   in a gearshift position changing condition where the driver changes the gearshift position, said control module setting a torque variation under gearshift position change according to the measured vehicle speed and controlling the motor to decelerate said motor vehicle with a total deceleration torque as a sum of the set deceleration torque demand and the set torque variation.   
     
     
         2 . A motor vehicle in accordance with  claim 1 , wherein said control module sets the torque variation under gearshift position change to give a smaller torque against a higher vehicle speed, in the gearshift position changing condition where the driver shifts down the gearshift position and controls the motor with the total deceleration torque including the set torque variation. 
     
     
         3 . A motor vehicle in accordance with  claim 1 , wherein said control module sets the torque variation under gearshift position change to have a gentler gradient against a higher vehicle speed, in the gearshift position changing condition where the driver shifts down the gearshift position and controls the motor with the total deceleration torque including the set torque variation. 
     
     
         4 . A motor vehicle in accordance with  claim 1 , wherein said control module sets the torque variation under gearshift position change to give a greater torque against a lower speed in the changed gearshift position, in the gearshift position changing condition where the driver shifts down the gearshift position and controls the motor with the total deceleration torque including the set torque variation. 
     
     
         5 . A motor vehicle in accordance with  claim 1 , wherein said control module identifies the gearshift position changing condition to set the torque variation and control the motor until elapse of a preset time period since the change of the gearshift position. 
     
     
         6 . A motor vehicle in accordance with  claim 5 , wherein said control module varies the preset time period corresponding to the changed gearshift position. 
     
     
         7 . A motor vehicle in accordance with  claim 6 , wherein said control module varies the preset time period to have a longer time period against a lower speed in the changed gearshift position, in the gearshift position changing condition where the driver shifts down the gearshift position. 
     
     
         8 . A motor vehicle in accordance with  claim 1 , wherein said control module varies the preset time period according to the measured vehicle speed. 
     
     
         9 . A motor vehicle in accordance with  claim 8 , wherein said control module varies the preset time period to have a longer time period against a higher vehicle speed, in the gearshift position changing condition where the driver shifts down the gearshift position. 
     
     
         10 . A control method of a motor vehicle driven with output power of a motor having power generation capacity,
 said control method setting a deceleration torque demand corresponding to a measured vehicle speed and a detected gearshift position in said motor vehicle moving under an accelerator released state selected by a driver,   in a gearshift position fixing condition where the driver does not change the gearshift position, said control method controlling the motor to decelerate said motor vehicle with the set deceleration torque demand,   in a gearshift position changing condition where the driver changes the gearshift position, said control method setting a torque variation under gearshift position change according to the measured vehicle speed and controlling the motor to decelerate said motor vehicle with a total deceleration torque as a sum of the set deceleration torque demand and the set torque variation.