Nissan Motor Company Limited

Haruhisa Tsuchikawa

Hiroki Shimoyama

Yutaka Takamura

Hiroyuki Ashizawa

Hiroki Matsui

Masami Hasegawa

Susumu Yoshida

Ken Ito

Kazutaka Adachi

Masami Suzuki

Shinichiro Joe

Munetoshi Ueno

Kaori Tanishima

Hiroshi Arita

Tsuyoshi Yamanaka

Taiichi Onoyama

Takeshi Ohno

Tadashi Okuda

Katsuhiro Matsuo

Terumasa Hidaka

Tomoyuki Kodawara

Kazuyuki Kouno

Yuya Kogure

Tomoyuk Kodawara

Takamura Yutaka

Arita Hiroshi

A neutral determination device is provided with an inhibitor switch and a controller. The inhibitor switch outputs an inhibitor switch signal that indicates a vehicle running range of a vehicle. The controller is programmed to execute a neutral determination process upon determining the vehicle running range exists based on the inhibitor switch signal and a rotational speed control is being performed on a motor that is configured to output a force that drives the vehicle. The controller is programmed to determine existence of a neutral state of a control valve that is configured to selectively supply a control hydraulic pressure to a hydraulic pressure chamber of the clutch upon determining that a motor torque during the rotational speed control is smaller than an estimated motor torque based on a target transmission torque capacity of a clutch that selectively connects and disconnects the motor to and from a drive wheel.

Neutral determination device and vehicle control apparatus

Provided is a hybrid vehicle in which a motor/generatoris positioned between an engineand an automatic transmission, the engineand the motor/generatorare connected through a first clutchand a second clutchis provided between the motor/generatorand a drive road wheel. In an HEV mode in which the first clutchis engaged, when deceleration of a vehicle is determined to be rapid deceleration of a threshold value or greater, the first clutchis released and at the same time fuel supply to the engineis stopped through an engine controller. Even when, due to rapid decelerating, the engine speed Ne drops to an idling speed or lower due to delay in the release of the first clutch, there is no combustion or explosion and thus floor vibration does not occur.

Hybrid vehicle rapid deceleration control device

A control device for a hybrid vehicle has an engine, a motor configured to output a driving force of the vehicle and performing a startup of the engine, a first engagement element interposed between the engine and the motor that selectively connects and releases the engine and the motor, a second engagement element interposed between the motor and a driving wheel that selectively engages and releases the motor and the driving wheel, a driving force transmission system load detecting device that either detects or estimates a load of the driving force transmission system, and an engine/motor slip drive control unit that slip engages the first engagement element with the engine maintaining in rotating state at a predetermined rotation speed, and slip engages the second engagement element with the motor at a rotation speed lower than the predetermined rotation speed.

Control device for hybrid vehicle

A gradient determination control unit releases the hold of a gradient determination result when a state where a road surface gradient detected by a gradient detection unit is smaller than a gradient release determination threshold value continues for a second predetermined time or longer if a vehicle is determined to be in a traveling state by a traveling state determination unit, and releases the hold of the gradient determination result when the road surface gradient detected by the gradient detection unit becomes smaller than the gradient release determination threshold value if the vehicle is determined to be in a stopped state by the traveling state determination unit.

A control system for a hybrid vehicle includes a mode selection unit for start request of an engine; a slip determination unit for determining whether or not a second clutch is allowed to slip; and a start determination unit for determining whether or not to allow the engine to start. The start determination unit prevents the engine from starting when an input rotation speed or an output rotation speed of an automatic transmission is less than a predetermined value in the presence of the start request of the engine from the mode selection unit and the slip determination unit determines that the second clutch is not allowed to slip.

Control device and control method for hybrid vehicle

Provided herein is a vehicle drive force control. When a driver requests to start the vehicle with the brake OFF and depresses the accelerator pedal, a target drive torque exceeds a gradient load. To avoid excess current being supplied to the motor, the upper limit of motor speed, which is the input speed of a second clutch, is set to a value less than a slip detectable limit value at which it becomes possible to detect slip rotation, i.e. the difference over the output side rotation speed. When the target drive torque exceeds the gradient load, the lower limit of the input speed of the second clutch (the motor speed) is set to a value equal to or greater than the slip detectable limit value so that the required driving force can be achieved by the gradient load corresponding driving force control.

Vehicle drive force control device

A hybrid vehicle control device is provided that is capable of achieving stable input torque control and torque capacity control of the clutch. When transitioning between a slip drive mode, in which the vehicle travels by controlling the rotation speed of the drive source and controlling the slip state of a starting clutch, and an engagement drive mode, in which the vehicle travels by controlling the torque of the drive source and completely engaging the starting clutch, the torque of the inertia component of the drive source side is deducted from the target drive torque set on the basis of the acceleration opening degree set as the starting clutch transfer torque capacity in the slip state.

Hybrid vehicle control device

In order to attain a stable traction control regardless of an inertia change in a driving system, when a driving force transmitted from driving wheels to a road surface is lowered by a certain quantity by torque control, the driving force is lowered according to a transmission torque capacity of a clutch element for connecting and disconnecting a power source and the driving wheels.

Traction control system for vehicle

Disclosed herein are embodiments of a control apparatus for a hybrid vehicle that is capable of suppressing overheating of the second clutch. Control is switched between engine-used slip drive control and motor drive control on a basis of a temperature of the second clutch. Control methods for a hybrid vehicle are also disclosed.

Control apparatus of a hybrid vehicle and method for controlling the same

A control apparatus for a hybrid vehicle that is capable of suppressing overheating of the second clutch is taught herein. Control is switched between engine-used slip drive control and motor drive control on a basis of a vehicle load such as weight or a road incline gradient. Control methods for hybrid vehicles are also disclosed.

A hybrid vehicle drive control system is configured to perform engine startup when switching from an electric drive mode to a hybrid drive mode, without creating a sense of output torque loss. In particular, a controller selectively controls a first clutch disposed between the engine and the motor/generator and a second clutch disposed between the motor/generator and a drive wheel to switch between an electric drive mode in which the first clutch is released and the second clutch is engaged, and a hybrid drive mode in which both the first and second clutches are engaged. The controller sets the second torque transfer capacity to a value that is more than zero and less than the target motor/generator torque of the motor/generator when switching from the electric drive mode to the hybrid drive mode and when starting the engine.

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Yokohama, Japan

Haruhisa Tsuchikawa