Vehicular torque control device and torque control method

A motor torque control device for an electric vehicle, comprising:

• a storage unit;
• gear stage detection means for detecting a gear stage of a transmission of the electric vehicle, which uses an electric motor as a power source, in current travelling;
• motor rotating speed detection means for detecting a motor rotating speed of the electric motor in current travelling;
• driving wheel rotating speed detection means for detecting a driving wheel rotating speed of the electric vehicle in current travelling;
• and
• motor torque control means for controlling motor output torque of the electric motor in current travelling,
• wherein the storage unit stores theoretical drive ratios corresponding with the gear stages respectively, and
• wherein, when a first gear stage is shifted down to a second gear stage, the motor torque control means makes the motor output torque increase, in the case that a relative value of a current drive ratio calculated on the basis of the motor rotating speed and the driving wheel rotating speed with respect to the theoretical drive ratio corresponding with the second gear stage is equal to or greater than a first threshold value, so that the current drive ratio becomes close to the theoretical drive ratio corresponding with the second gear stage.

A vehicular torque control method which uses a torque control device, including a storage unit;

• gear stage detection means for detecting a gear stage of a transmission of a vehicle in current travelling;
• engine speed detection means for detecting an engine speed of the vehicle in current travelling;
• driving wheel rotating speed detection means for detecting a driving wheel rotating speed of the vehicle in current travelling;
• and torque control means for controlling output torque of an engine of the vehicle in current travelling, the storage unit storing theoretical drive ratios corresponding with the gear stages respectively, the method comprising:
• increasing, when a first gear stage is shifted down to a second gear stage, the output torque, in the case that a relative value of a current drive ratio calculated on the basis of the engine speed and the driving wheel rotating speed with respect to the theoretical drive ratio corresponding with the second gear stage is equal to or greater than a first threshold value, so that the current drive ratio becomes close to the theoretical drive ratio corresponding with the second gear stage.

A motor torque control method for an electric vehicle which uses a motor torque control device, including a storage unit;

• gear stage detection means for detecting a gear stage of a transmission of the electric vehicle, which uses an electric motor as a power source, in current travelling;
• motor rotating speed detection means for detecting a motor rotating speed of the electric motor in current travelling;
• driving wheel rotating speed detection means for detecting a driving wheel rotating speed of the electric vehicle in current travelling;
• and motor torque control means for controlling motor output torque of the electric motor in current travelling, the storage unit storing theoretical drive ratios corresponding with the gear stages respectively, the method comprising:
• increasing, when a first gear stage is shifted down to a second gear stage, the motor output torque, in the case that a relative value of a current drive ratio calculated on the basis of the motor rotating speed and the driving wheel rotating speed with respect to the theoretical drive ratio corresponding with the second gear stage is equal to or greater than a first threshold value, so that the current drive ratio becomes close to the theoretical drive ratio corresponding to the second gear stage.