Hitachi, Ltd.

Norikazu Matsuzaki

Masaru Ito

Shinya Imura

Takashi Yokoyama

Tatsuyuki Yamamoto

Takehiko Kowatari

Kohei Itoh

Shin Fujiwara

Hidekazu Moriki

Yuuichirou Takamune

A vehicle can ensure an engine torque the driver desires even though the load torque of a generator with respect to the engine varies, and in particular can restrain occurrence of such a risk that an engine stall occurs when a load to the engine is large upon, for example, engagement of a clutch. A controller predicts a load torque of the generator with respect to the engine in future several hundred milliseconds at maximum from the present time, in view of a magnetic field voltage and a speed of the generator at the present time, and controls the engine in accordance with the predicted load torque in order to prevent the output torque of the engine from being insufficient.

Vehicle, generator control apparatus in vehicle, and vehicle drive unit

In a four-wheel drive vehicle, front wheelsL andR are driven by an engine, and rear wheelsL andR are driven by an electric motor. A high-power alternatoris driven by the engine, and electric power generated from the alternatordrives the motor. In addition to controlling the power generation of the high-power alternatorand the driving of the motor, a 4WD CUestimates an induced voltage E of the motorfrom a voltage MHV of the motor and from an output current Ia of the high-power alternator, and estimates a rotating speed Nm of the motor from estimation results on the induced voltage E.

Vehicle driving system

In a control apparatus for a vehicle having an electric motor for driving the wheels of the vehicle, an electric power source for energizing the electric motor, a motor torque target value calculation unit for controlling the electric power source, and a field current target value calculation unit, the motor field current is momentarily decreased when the difference between the actual motor armature current and the motor armature current target value exceeds a predetermined value or when the wheels are deemed to slip, and the motor field current is increased as the actual armature current of the motor substantially follows the motor armature current target value.

Control apparatus for vehicle

A differentiator calculates the acceleration of the rear wheels. An acceleration threshold calculation means enable the skid-detection acceleration threshold to be adjusted corresponding to the conditions of the vehicle. An acceleration skid-detection means make a comparison between the acceleration of the wheels obtained by the differentiator and the skid-detection acceleration threshold adjusted by the acceleration threshold calculation means, and determine whether or not a skid of the wheels has occurred, based upon the comparison result. Such an arrangement provides a vehicle driving force system having a function of detecting a skid even in a case that a skid of the wheels has occurred at a low acceleration of the vehicle.

Vehicle driving system with adaptive skid control

To provide a four-wheel drive system which improves running performance of an automotive vehicle by inhibiting a driving torque from becoming insufficient upon occurrence of a slip. An R slip sensing means of a DC motor torque calculating means senses a slip due to a spin of rear wheels. When the rear wheel slip is sensed, an R slip DC-motor-torque correcting means corrects a torque of the rear wheels so that a driving force of the rear wheels is reduced and then increased. The R slip DC-motor-torque correcting means reduces a driving torque of the rear wheels to eliminate the slip and holds the reduced driving torque until the slip is eliminated, and then increases the driving torque to a value lower than a value which the driving torque has taken at the time of occurrence of the slip. The driving torque is increased to a predetermined limit value depending on the number of slips.

Four-wheel drive system

In a hybrid car, or an electric motor-driven four-wheel-drive vehicle, in which an electric motor is driven directly by an output from a generator, vehicle running performance is enhanced. The output from the generator is controlled so as to maintain a generator torque in a range, in which the vehicle does not stall. Specifically, a driving apparatus for the hybrid car includes a second generatordriven by an enginefor driving one pair of either front or rear wheels, an electric motordriven through directly receiving the output from the second generatorand driving the other pair of either the front or rear wheels, and a four-wheel-drive control unitcontrolling driving of the second generatorand the electric motor. When the engineis in an overloaded condition, the four-wheel-drive control unitlimits the output of the second generator

Hybrid car and control apparatus therefor, and hybrid four-wheel-drive car and control apparatus therefor

It is desirable prevent the speed of an engine, that is driving an electric-power generator, from abruptly increasing when electric power generation by the electric power generator, which supplies electric power to a wheel-driving motor, is stopped. Thus, a control apparatus is provided for a vehicle electric power generator to control the amount of electric power generated by the electric power generator, which is connected to, and driven by, an engine for driving a vehicle. Wheel speed detection means is provided to detect slipping of the wheels, and the control apparatus operates to ensure that, when the amount of electric power generated is to be reduced, if the wheels are not slipping, the amount of electric power generation by the electric power generator is slowly reduced, in comparison with the case where the wheels are slipping.

Control apparatus for vehicle-use electric power generator

A motor control apparatus for a hybrid car is capable of reducing a spin of the wheel driven by the motor. The hybrid car comprises an engine driven wheel driven by an engine and a motor driven wheel to be driven by a motor for driving the wheel not driven by the engine. The hybrid car has an engine, a front wheeldriven by the engine, a generatorconnected to this engine and driven thereby, an electric motorfor driving the rear wheelusing power provided by the generator without being driven by the engine, and a controllermounted on the car to control the output of this electric motor. The controllercontrols the field currents of the electric motor and generator in such a way that the driving torque of the motor driven wheel to be driven by the electric motor is smaller than the driving torque of the engine driven wheel to be driven by the engine, thereby ensuring traction and car stability.

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Mito, Japan

Norikazu Matsuzaki