公开(公告)号：US20200331461A1

公开(公告)日：2020-10-22

申请号：US16839323

申请日：2020-04-03

Applicant: Mazda Motor Corporation

Inventor： Yasumasa Imamura ,  Taku Yoshida ,  Daisuke Umetsu

IPC: B60W30/045 ,  B60K23/08 ,  B60W10/119 ,  B60W10/184

Abstract: A vehicle system includes a drive source configured to generate torque for driving a vehicle, wheels including rear wheels that are primary driving wheels and front wheels that are auxiliary driving wheels, a torque distribution mechanism configured to distribute the torque of the drive source to the front wheels and the rear wheels, a steering wheel configured to be operated by a driver, and a controller configured to control at least the torque distribution mechanism. When the steering wheel is steered in reverse and a yaw rate difference related value related to a difference between a target yaw rate to be generated on the vehicle according to the steering of the steering wheel and an actual yaw rate actually generated on the vehicle is greater than or equal to a first predetermined value, the controller controls the torque distribution mechanism to reduce the torque distributed to the rear wheels.

公开(公告)号：US10471952B2

公开(公告)日：2019-11-12

申请号：US16006690

申请日：2018-06-12

Applicant: Mazda Motor Corporation

Inventor： Yasumasa Imamura ,  Yasushi Yagi ,  Daisuke Kofu ,  Akihiro Tatara ,  Naoki Nobutani

IPC: B60W30/02

Abstract: A method of controlling a driving force of a four-wheel drive vehicle includes causing a control unit to acquire a vehicle speed, a lateral acceleration, a driving force of a wheel, a road surface friction coefficient, and a ground contact load of the wheel when the vehicle is traveling, determine whether a road surface is rough based on the acquired road surface condition, correct, when the road surface is determined to be rough, the load of the wheel, by applying thereto a load change rate set according to the roughness, predict a slip occurrence of the wheel by comparing a product of the corrected load and the road surface friction coefficient to a total force of the driving force and a lateral force caused by a lateral acceleration in cornering, and reduce, when the slip occurrence is predicted, the driving force so as to prevent the slip occurrence.

公开(公告)号：US20190100210A1

公开(公告)日：2019-04-04

申请号：US16127529

申请日：2018-09-11

Applicant: Mazda Motor Corporation

Inventor： Yasumasa Imamura ,  Osamu Sunahara ,  Daisuke Umetsu ,  Naoki Nobutani

IPC: B60W30/18 ,  B60K23/08 ,  B60W10/06 ,  B60W10/119

Abstract: The vehicle driving force control device comprises: a behavior control mechanism for reducing a driving force of an engine according to a steering speed; a driving force distribution mechanism for distributing the driving force of the engine to rear road wheels; and an ECU for controlling the mechanisms. The behavior control mechanism reduces the driving force by a target torque reduction amount set based on the steering speed, to thereby generate a deceleration, and the driving force distribution mechanism distributes the driving force to the front road wheels and the rear road wheels based on a distribution rate set for the rear road wheels depending on a traveling state, and the ECU corrects the distribution rate based on the target torque reduction amount during cornering of the vehicle.

公开(公告)号：US20230398992A1

公开(公告)日：2023-12-14

申请号：US18190845

申请日：2023-03-27

Applicant: Mazda Motor Corporation

Inventor： Yasumasa Imamura ,  Juntaro Matsuo ,  Daisuke Umetsu ,  Kohei Okada ,  Junichi Kubo

IPC: B60W30/182 ,  B60W50/08 ,  B60W20/10 ,  B60W10/08 ,  B60W10/06

CPC classification number: B60W30/182 ,  B60W50/082 ,  B60W20/10 ,  B60W10/08 ,  B60W10/06 ,  B60W2710/083

Abstract: A hybrid vehicle system is configured to be capable of switching among four or more of a plurality of traveling modes including a hybrid electric vehicle (HEV) mode and an electric vehicle (EV) mode, and includes one toggle switch for selecting any one of the plurality of traveling modes and a controller. The controller selects the plurality of traveling modes in sequence whenever the toggle switch accepts each of operations to a first direction and a second direction. The HEV mode is set to be changed to different traveling modes between when the toggle switch accepts one or a plurality of operations to the first direction and when the toggle switch accepts an operation to the second direction, and the HEV mode and the EV mode are set to be continuous in an order of selection by the controller.

公开(公告)号：US11529991B2

公开(公告)日：2022-12-20

申请号：US16953735

申请日：2020-11-20

Applicant: Mazda Motor Corporation

Inventor： Daisuke Umetsu ,  Yasumasa Imamura

IPC: B60W10/196 ,  B60W30/045 ,  B60W40/13 ,  B62D15/02 ,  B60W30/08

Abstract: A control system for a vehicle is provided, which includes an accelerator pedal and a steering wheel configured to be operated by a driver, an accelerator opening sensor configured to detect an accelerator opening corresponding to operation of the accelerator pedal, a steering angle sensor configured to detect a steering angle corresponding to operation of the steering wheel, and a controller configured to set an additional deceleration to be applied to the vehicle in order to control a posture of the vehicle based on the detected steering angle, when the steering wheel is turned, and apply the additional deceleration to the vehicle. The controller sets the additional deceleration based on the detected accelerator opening, in addition to the steering angle, and sets the additional deceleration larger while the vehicle is towing than while the vehicle is not towing, when the additional decelerations are compared at the same accelerator opening.

公开(公告)号：US20220340136A1

公开(公告)日：2022-10-27

申请号：US17716272

申请日：2022-04-08

Applicant: Mazda Motor Corporation

Inventor： Naoki Nobutani ,  Yasumasa Imamura ,  Daisuke Umetsu ,  Naoki Takata ,  Juntaro Matsuo

IPC: B60W30/182 ,  B60W50/14

Abstract: A travel mode switching device for a vehicle is provided, which is switchable between a plurality of travel modes including a sport travel mode and a towing travel mode. The device includes a travel mode selection interface that allows a driver to select one of the travel modes, a towing detection sensor that detects a towing state, and a processor configured to execute a travel mode switching module to switch the travel mode to the travel mode selected by the travel mode selection interface, and a travel mode regulating module to regulate the selection of the sport travel mode by the travel mode selection interface when the towing state is detected by the towing detection sensor, and regulate the selection of the towing travel mode by the travel mode selection interface when the towing state is not detected.

公开(公告)号：US11458836B2

公开(公告)日：2022-10-04

申请号：US16752449

申请日：2020-01-24

Applicant: MAZDA MOTOR CORPORATION

Inventor： Yasumasa Imamura ,  Naoki Nobutani ,  Daisuke Umetsu

IPC: B60K17/35 ,  B60W40/13 ,  B60W10/02

Abstract: A vehicle system includes an engine driving a vehicle, a front wheel and a rear wheel, a suspension device with an attachment portion to a vehicle body which is located at a higher level than a center axis of the rear wheel, an electromagnetic coupling to distribute a torque of the engine to the front wheel and the rear wheel, a steering wheel to be operated by a driver, a steering angle sensor to detect a steering angle corresponding to operation of the steering wheel, and a controller to control the engine and the electromagnetic coupling. The controller is configured to control the electromagnetic coupling such that the torque distributed to the rear wheel is decreased in accordance with a returning operation of the steering wheel which is detected by the steering angle sensor.

公开(公告)号：US11420618B2

公开(公告)日：2022-08-23

申请号：US16346570

申请日：2017-11-02

Applicant: MAZDA MOTOR CORPORATION

Inventor： Yasumasa Imamura ,  Yasushi Yagi ,  Tetsushi Marutani ,  Naoki Nobutani ,  Daisuke Kofu ,  Akihiro Tatara

IPC: B60W30/188 ,  B60W30/02 ,  B60K17/348 ,  B60W10/06 ,  B60W10/119 ,  B60W10/14 ,  B60W40/064 ,  B60W40/068

Abstract: A driving force control device 1 for a vehicle V comprises: a D-μ map M1 defining a linear correlation between a driving stiffness D and a maximum road surface μ; a slip ratio calculation circuit 21 for calculating a slip ratio S of one of a pair of front road wheels 10L, 10R; a DS calculation circuit 22 for calculating the driving stiffness D corresponding to a value the slip ratio S calculated by the slip ratio calculation circuit 21; a maximum road surface μ calculation circuit 23 for assigning a value of the driving stiffness D calculated by the DS calculation circuit 22 to the D-μ map M1 to calculate the maximum road surface μ; and a driving force distribution circuit 24 for controlling a driving force, using a value of the maximum road surface μ calculated by the maximum road surface μ calculation circuit 23.

公开(公告)号：US11143249B2

公开(公告)日：2021-10-12

申请号：US16875803

申请日：2020-05-15

Applicant: Mazda Motor Corporation

Inventor： Yasumasa Imamura ,  Naoki Nobutani ,  Keisuke Haruta ,  Daisuke Umetsu ,  Yasushi Yagi

IPC: F16D48/06

Abstract: A driving force distribution control device mounted on a four-wheel drive vehicle is provided. A coupling mechanism controller connects a drive shaft with an auxiliary driving wheel and sets a fastening force as a first fastening force, when an increase rate in an accelerator opening becomes more than a given value and a vehicle speed is below a given first speed, and changes the fastening force from the first fastening force to a second fastening force, when a slip of at least one of main driving wheels is detected after the fastening force is set to the first fastening force, and before a given time period has lapsed from the setting of the fastening force, or before the vehicle speed becomes faster than a given second speed. The second fastening force at least immediately after the change of the fastening force is a value larger than the first fastening force.

公开(公告)号：US11097612B1

公开(公告)日：2021-08-24

申请号：US17102102

申请日：2020-11-23

Applicant: Mazda Motor Corporation

Inventor： Yasumasa Imamura ,  Daisuke Umetsu ,  Yoichi Fujioka ,  Naoki Nobutani

IPC: B60K17/348 ,  B60K23/08 ,  B60K17/02

Abstract: A driving force distribution control system for a four-wheel drive vehicle is provided. The four-wheel drive vehicle uses front wheels as main driving wheels, and when a towed vehicle is coupled to a coupling part provided to a rear part of the four-wheel drive vehicle, the towed vehicle has the center of gravity position so that a downward load in a vehicle up-and-down direction is applied to the rear part of the vehicle through the coupling part. A driving force distribution control device includes a towing determination module configured to determine whether the vehicle is towing the towed vehicle, and when it is determined that the vehicle is towing the towed vehicle, a driving force distribution control device controls the driving force distributing device so that the driving force distributing amount to rear wheels becomes larger than that when the four-wheel drive vehicle is not towing the towed vehicle.