Nissan Motor Company Limited

Fujitsu Corporation

Hideo Iwamoto

Takenori Hashizume

Kazutaka Adachi

Akira Higashimata

Kenichi Mori

Ken Ito

Hiroyuki Ashizawa

Junji Tsutsumi

Akio Kawai

Eigo Sakagami

A traction transmission capacity control device includes a one-direction turning-stop-position detecting means configured to detect a position at which the turning of a second roller stops after a second-roller turning means starts to turn the second roller in one direction; an another-direction turning-stop-position detecting means configured to detect a position at which the turning of the second roller stops after the second-roller turning means starts to turn the second roller in another direction; and a second-roller turning-motion reference-point setting means configured to set a center position between the position detected by the one-direction turning-stop-position detecting means and the position detected by the another-direction turning-stop-position detecting means, as a turning-motion reference point of the second roller. The traction transmission capacity control device is configured to perform a traction transmission capacity control based on a second-roller turning amount given from the turning-motion reference point of the second roller.

Traction transmission capacity control device used in drive force distribution device

In an automatic vehicular velocity control apparatus for an automotive vehicle, a relative velocity detector is provided to detect a relative velocity of a preceding vehicle to the vehicle, an inter-vehicle distance command value calculator is provided to calculate an inter-vehicle distance command value, a control response characteristic determinator is provided to determine a control response characteristic of the inter-vehicle distance control system according to a deviation from the inter-vehicle distance command value to a detected value of the inter-vehicle distance and a detected value of the relative velocity, a vehicular velocity command value calculator is provided to calculate a vehicular velocity command value on the basis of the determined control response characteristic of the inter-vehicle distance control system, and a vehicular velocity control section is provided to control at least one of a driving force of the vehicle, a braking force of the vehicle, and a gear ratio of a transmission in such a manner that a detected value of the vehicular velocity is made coincident with the vehicular velocity command value. The control response characteristic determinator includes maps representing a relationships of a specific angular frequency &ohgr; (or &ohgr;c) with respect to the relative velocity &Dgr;V and an inter-vehicle distance deviation &Dgr;L and a damping factor &zgr;M (or &zgr;c) with respect to the relative velocity and the inter-vehicle distance deviation.

Automatic vehicular velocity control apparatus for automotive vehicle

In an automatic vehicular velocity control apparatus for an automotive vehicle, a relative velocity detector is provided to detect a relative velocity of a preceding vehicle to the vehicle, an inter-vehicle distance command value calculator is provided to calculate an inter-vehicle distance command value, a control response characteristic determinator is provided to determine a control response characteristic of the inter-vehicle distance control system according to a deviation from the inter-vehicle distance command value to a detected value of the inter-vehicle distance and a detected value of the relative velocity, a vehicular velocity command value calculator is provided to calculate a vehicular velocity command value on the basis of the determined control response characteristic of the inter-vehicle distance control system, and a vehicular velocity control section is provided to control at least one of a driving force of the vehicle, a braking force of the vehicle, and a gear ratio of a transmission in such a manner that a detected value of the vehicular velocity is made coincident with the vehicular velocity command value. The control response characteristic determinator includes maps representing a relationships of a specific angular frequency &ohgr;,(or &ohgr;C) with respect to the relative velocity &Dgr;V and an inter-vehicle distance deviation &Dgr;L and a damping factor &zgr;M (or &zgr;c) with respect to the relative velocity and the inter-vehicle distance deviation.

In a relative velocity detecting apparatus for an automotive vehicle applicable to an automatic vehicular velocity control system to follow up a preceding vehicle, an inter-vehicle distance detector is provided which is disposed on the vehicle so as to be oriented toward a forward detection zone of the vehicle to detect an inter-vehicle distance to the preceding vehicle which is running ahead of the vehicle, to recognize whether the preceding vehicle has entered the forward detection zone and to derive the inter-vehicle distance value lrn (n&equals;1, 2, . . . , n) whenever a predetermined period of time has passed when recognizing that the preceding vehicle has entered the forward detection zone, a relative velocity calculator is provided to perform a band pass filter calculation for the inter-vehicle distance value lrn, the band pass filter being expressed as: CF,&middot;S/(S,&plus;CF,&middot;S&plus;CF,), wherein CF,and CF,denote constants, and to calculate a relative velocity value vr of the preceding vehicle to the vehicle according to the above equation, and an initial value setting section is provided to set a first initial value lr,of the inter-vehicle distance value and a second initial value vr,of the relative velocity value in the band pass filter calculation by the relative velocity calculator during a run of the vehicle.

Relative velocity detecting apparatus for automotive vehicle

In apparatus and method for controlling a vehicular velocity for an automotive vehicle, when a controller carries out a preceding vehicle follow-up control to follow up a preceding vehicle which is traveling ahead of the vehicle and is decelerated and a vehicular velocity of the vehicle becomes reduced and has crossed a set lower limit value of the vehicular velocity in a vehicular velocity controllable range, the controller releases the preceding vehicle follow-up control but continues a braking operation through a vehicular brake system using a function generator (Pbrk*&equals;f(t)MPa) to prevent a sudden G drop from occurring.

Apparatus and method for automatically controlling vehicular velocity

In apparatus and method for controlling a vehicular velocity for an automotive vehicle, a vehicular velocity and an inter-vehicle distance from the vehicle to another vehicle which is running ahead of the vehicle are detected, a lateral acceleration imposed on a vehicle body of the vehicle which is generally developed when the vehicle is running on a curved road is detected, a target value of the vehicular velocity of the vehicle according to which a detected value of the inter-vehicle distance is made equal to value of a target inter-vehicle distance is calculated, a correction is made on the calculated value of the target vehicular velocity according to a detected value (magnitude) of the lateral acceleration (lateral G), the vehicular velocity of the vehicle is controlled in such a manner that the detected value of the vehicular velocity is made equal to the corrected target vehicular velocity.

The diagnostic device comprises voltage divider resistors, two comparators, a start switch, a microcomputer, two transistors, and two light emitting diodes. The ignition signal is voltage-divided by the voltage divider resistors, and the result of this voltage division is input into the positive terminals of the comparators. Reference voltages are input to the negative terminals of the comparators which determine how high the inputs to the positive terminals must be for each comparator to have an 'H' level output. When the start switch is turned ON the device starts to operate. In the microcomputer, which has a timer function built in, the interrupt terminal (INT) becomes connected to the output terminal of the comparator; the reset terminal (RES) becomes connected to the start switch. In addition, when the result of the diagnosis is normal, the output terminal OUT 1 of the microcomputer connected to the base of the transistor outputs a signal, while when the result of the diagnosis is abnormal, the output terminal OUT 2 connected to the base of the transistor outputs a signal. A light emitting diode of one color, for example green, is connected to the collector of the transistor, and lights up when the result of the diagnosis is normal, while a light emitting diode of another color, for example red, is connected to the collector of the other transistor, and lights up when the result of the diagnosis is abnormal.

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Kanagawa, Japan

Hideo Iwamoto