公开(公告)号：US09561720B2

公开(公告)日：2017-02-07

申请号：US14637705

申请日：2015-03-04

Applicant: JTEKT Corporation ,  Mazda Motor Corporation

Inventor： Kotaro Sarai ,  Tomoaki Kato ,  Hiroto Kawano ,  Daisuke Kofu ,  Yasushi Yagi

IPC: G06F7/00 ,  G06F17/00 ,  G06F19/00 ,  B60K23/08 ,  B60K17/35

CPC classification number: B60K23/0808 ,  B60K17/35 ,  B60K2023/0833 ,  B60K2023/0858

Abstract: A driving force distribution control apparatus includes: a driving force transmission device including a clutch which can change distribution of a driving force to front wheels and rear wheels of a four-wheel drive vehicle; and a controller which controls an engagement force of the clutch in accordance with a traveling state. The controller includes a different-diameter tire detector which detects an attachment of a different-diameter tire to one of the front wheels and the rear wheels when a rotation speed ratio between the front wheels and the rear wheels continues to be equal to or larger than a reference rotation speed ratio for a predetermined time. The different-diameter tire detector performs detection of the attachment of the different-diameter tire when it is determined that the wheels are unlikely to slip based on an outside condition.

Abstract translation: 驱动力分配控制装置包括：驱动力传递装置，包括可以改变驱动力分配到四轮驱动车辆的前轮和后轮的离合器; 以及控制器，其根据行驶状态来控制离合器的接合力。 该控制器包括一个不同直径的轮胎检测器，当前轮和后轮之间的转速比继续等于或大于该值时，检测不同直径的轮胎与前轮和后轮之一的连接。 基准转速比达预定时间。 根据外部条件判定车轮不易滑动，不同直径的轮胎检测器进行不同直径的轮胎的安装的检测。

公开(公告)号：US10981572B2

公开(公告)日：2021-04-20

申请号：US16145526

申请日：2018-09-28

Applicant: Mazda Motor Corporation

Inventor： Yasumasa Imamura ,  Yasushi Yagi ,  Akihiro Tatara ,  Tetsushi Marutani ,  Hideki Tani

IPC: B60W30/188

Abstract: A method of controlling driving force of a vehicle includes estimating a first maximum road surface frictional coefficient based on a driving stiffness defined by a micro slip ratio and driving force of drive wheels, in a first driving state where the vehicle travels straight at a constant acceleration, estimating a second maximum road surface frictional coefficient based on a steering reaction force detected by an electric power steering device, in a second driving state different from the first state and where the vehicle is steered, estimating a third maximum road surface frictional coefficient to be a given value in a third driving state different from the first and second states and where an outdoor air temperature is above a determination temperature, and controlling the driving force to settle within a friction circle defined by each of the highest frictional coefficients and a ground contact load of the drive wheels.

公开(公告)号：US20180362021A1

公开(公告)日：2018-12-20

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

CPC classification number: B60W30/02 ,  B60W2520/26 ,  B60W2520/28 ,  B60W2550/147 ,  B60W2720/26

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：US20150258889A1

公开(公告)日：2015-09-17

申请号：US14637705

申请日：2015-03-04

Applicant: JTEKT Corporation ,  Mazda Motor Corporation

Inventor： Kotaro SARAI ,  Tomoaki Kato ,  Hiroto Kawano ,  Daisuke Kofu ,  Yasushi Yagi

IPC: B60K23/08 ,  B60K17/344 ,  B60K17/35

CPC classification number: B60K23/0808 ,  B60K17/35 ,  B60K2023/0833 ,  B60K2023/0858

Abstract: A driving force distribution control apparatus includes: a driving force transmission device including a clutch which can change distribution of a driving force to front wheels and rear wheels of a four-wheel drive vehicle; and a controller which controls an engagement force of the clutch in accordance with a traveling state. The controller includes a different-diameter tire detector which detects an attachment of a different-diameter tire to one of the front wheels and the rear wheels when a rotation speed ratio between the front wheels and the rear wheels continues to be equal to or larger than a reference rotation speed ratio for a predetermined time. The different-diameter tire detector performs detection of the attachment of the different-diameter tire when it is determined that the wheels are unlikely to slip based on an outside condition.

Abstract translation: 驱动力分配控制装置包括：驱动力传递装置，包括可以改变驱动力分配到四轮驱动车辆的前轮和后轮的离合器; 以及控制器，其根据行驶状态来控制离合器的接合力。 该控制器包括一个不同直径的轮胎检测器，当前轮和后轮之间的转速比继续等于或大于该值时，检测不同直径的轮胎与前轮和后轮之一的连接。 基准转速比达预定时间。 根据外部条件判定车轮不易滑动，不同直径的轮胎检测器进行不同直径的轮胎的安装的检测。

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：US10464545B2

公开(公告)日：2019-11-05

申请号：US15615990

申请日：2017-06-07

Applicant: Mazda Motor Corporation

Inventor： Tetsushi Marutani ,  Hideki Tani ,  Daisuke Kofu ,  Yasushi Yagi

IPC: B60W10/119 ,  B60W30/18 ,  B60K17/348 ,  B60K23/08 ,  B60W10/04

Abstract: A control system of a four-wheel drive vehicle and a gradient value setting device of the vehicle is provided so as to reliably control a wheel skid despite the vehicle facing an intersecting direction intersecting a maximum tilt line direction. The vehicle includes an engine, front and rear wheels, an electronic control 4WD coupling, and a control unit. The distribution amount of the driving force to the rear wheels is set by the electronic control 4WD coupling. The control unit determines whether or not the vehicle faces the intersecting direction on the inclined road, and if so, sets the driving force distribution amount so that the difference between the driving force distribution amount to the front wheels and to the rear wheels is smaller as compared with on a flat road, and commands the electronic control 4WD coupling to distribute the driving force by the distribution amount.

公开(公告)号：US20200370608A1

公开(公告)日：2020-11-26

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：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：US10946863B2

公开(公告)日：2021-03-16

申请号：US16116808

申请日：2018-08-29

Applicant: Mazda Motor Corporation

Inventor： Yasumasa Imamura ,  Yasushi Yagi ,  Akihiro Tatara ,  Keisuke Haruta

IPC: B60W40/13

Abstract: A wheel load estimation method of a four-wheel drive vehicle driven by a rotational driving device comprises a correlation relationship setting step for previously setting a correlation relationship between a total weight and at least one of the front wheel load and the rear wheel load by variously changing a movable load of the vehicle, a total vehicle weight computation step for calculating a current total vehicle weight from an output torque of the rotational driving device and a longitudinal acceleration of the vehicle corresponding to the output torque, and a wheel load estimation step for estimating the wheel load of at least a driving wheel from the correlation relationship and the total vehicle weight.