초록 ▼

A driving force control system for an automotive vehicle using driving torque produced by at least one of an internal combustion engine and an electric motor for propulsion, and including a battery and a power-transmission mechanism having a continuously variable transmission, comprises sensors dete

A driving force control system for an automotive vehicle using driving torque produced by at least one of an internal combustion engine and an electric motor for propulsion, and including a battery and a power-transmission mechanism having a continuously variable transmission, comprises sensors detecting vehicle speed, engine speed, an accelerator operating amount, a state of charge of the battery. An electronic control unit calculates a target engine speed needed to realize the vehicle speed, the target driving torque and the target generated electric energy at the lowest fuel consumption, considering an efficiency of each of the engine, the electric motor, and the power-transmission mechanism, so as to operate the engine, the electric motor, and/or the power-transmission mechanism always at their optimum operating points depending on the ratio of a first time rate of doing work for the driver's required driving torque to a second time rate of doing work for the required generated electric energy, as well as the sum of the first and second time rates.

대표청구항 ▼

[ What is claimed is:] [1.]1. A driving force control system for an automotive vehicle using driving torque produced by at least one of an internal combustion engine and an electric motor for propulsion, and including a battery giving and receiving electricity to and from the electric motor and a po

[ What is claimed is:] [1.]1. A driving force control system for an automotive vehicle using driving torque produced by at least one of an internal combustion engine and an electric motor for propulsion, and including a battery giving and receiving electricity to and from the electric motor and a power-transmission mechanism having at least a continuously variable transmission for transmitting the driving torque therevia to drive wheels, said system comprising:a vehicle speed sensor detecting vehicle speed;an engine speed sensor detecting engine speed of the engine;an accelerator sensor detecting an accelerator operating amount;a battery state-of-charge detection device detecting a state of charge of the battery; anda control unit being configured to be electrically connected to the vehicle sensor, the engine speed sensor, the accelerator sensor, the battery state-of-charge detection device, the continuously variable transmission, the engine, and the electric motor, said control unit comprising:(a) a target driving-torque calculation section which calculates a target driving torque on the basis of the vehicle speed and the accelerator operating amount,(b) a target generated-electric-energy calculation section which calculates a target generated electric energy on the basis of a deviation of the state of charge of the battery from a desired state of charge,(c) a target engine-speed calculation section which calculates a target engine speed needed to realize the vehicle speed, the target driving torque and the target generated electric energy at a lowest fuel consumption, considering an efficiency of each of the engine, the electric motor, and the power-transmission mechanism,(d) a target torque calculation section which calculates a target engine torque of the engine and a target motor torque of the electric motor, both needed to realize the target driving torque and the target generated electric energy,(e) a transmission ratio control section which controls a transmission ratio of the continuously variable transmission so that the engine speed is adjusted to the target engine speed,(f) an engine torque control section which controls the engine so that torque produced by the engine is adjusted to the target engine torque, and(g) a motor torque control section which controls the electric motor so that torque produced by the electric motor is adjusted to the target motor torque.