JP6069832B2 - Vehicle straight traveling determination device and method - Google Patents

Vehicle straight traveling determination device and method Download PDF

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JP6069832B2
JP6069832B2 JP2011282280A JP2011282280A JP6069832B2 JP 6069832 B2 JP6069832 B2 JP 6069832B2 JP 2011282280 A JP2011282280 A JP 2011282280A JP 2011282280 A JP2011282280 A JP 2011282280A JP 6069832 B2 JP6069832 B2 JP 6069832B2
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寺川 智充
智充 寺川
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Aisin Corp
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Aisin Seiki Co Ltd
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Description

本発明は、走行中の車両が直進か否かを判定する直進判定装置及びその方法に関する。   The present invention relates to a straight traveling determination device and a method for determining whether or not a traveling vehicle travels straight.

従来技術による車両の直進判定装置では、前輪及び後輪のそれぞれの左右車輪速比の時間平均値を算出し、時間平均値をあらかじめ実験等によって設定した判定基準値と比較して車両が直進状態か否かを判定しているものがある。それぞれの時間平均値が判定基準値の範囲内ならば直進状態と判定する(例えば、特許文献1参照。)。   In the straight-run determination device for a vehicle according to the prior art, the time average value of the left and right wheel speed ratios of the front wheels and the rear wheels is calculated, and the vehicle is in a straight-running state by comparing the time average value with a determination reference value set in advance through experiments or the like. There is something that determines whether or not. If each time average value is within the range of the determination reference value, it is determined that the vehicle travels straight (for example, see Patent Document 1).

また、他の従来技術による車両の直進判定装置では、車速センサによって車速を測定し、トルクセンサにより操舵トルクを測定し、モータ角センサの測定値の時間微分により舵角速度を算出するものがある。車速、操舵トルク及び舵角速度を基準値と大小比較することによって直進状態を判定する(例えば、特許文献2参照。)。   Another conventional vehicle straight-ahead determination apparatus measures the vehicle speed with a vehicle speed sensor, measures the steering torque with a torque sensor, and calculates the steering angular velocity by time differentiation of the measured value of the motor angle sensor. A straight traveling state is determined by comparing the vehicle speed, the steering torque, and the steering angular velocity with reference values (see, for example, Patent Document 2).

特開平8−282222号公報JP-A-8-282222 特開2007−106283号公報JP 2007-106283 A

しかしながら、特許文献1の車両の直進判定装置では、左右車輪速比の時間平均値が判定基準値内であるか否かによって直進状態を判定するため、ラウンドアバウトやオーバルコース等の一定方向の旋回が続く走行では、時間平均値が判定基準値内に納まり直進状態と誤判定される問題がある。   However, in the straight traveling determination device for a vehicle disclosed in Patent Document 1, a straight traveling state is determined based on whether or not the time average value of the left and right wheel speed ratios is within the determination reference value. Therefore, turning in a certain direction such as a roundabout or an oval course is performed. When traveling is continued, there is a problem that the time average value falls within the determination reference value and is erroneously determined as a straight-ahead state.

また、特許文献2の車両の直進判定装置では、車速センサの他に、高価なトルクセンサ、モータ角センサが必要であり、コストが高くなる問題がある。   In addition, the straight traveling determination device for a vehicle disclosed in Patent Document 2 requires an expensive torque sensor and motor angle sensor in addition to the vehicle speed sensor, which increases the cost.

本発明は、上記問題に鑑みて成されたものであり、コストが高くなるのを抑制しつつ、直進判定の信頼度の高い直進判定装置及びその方法を提供することを目的とする。   The present invention has been made in view of the above problems, and an object of the present invention is to provide a straight traveling determination device and method with high reliability of straight traveling determination while suppressing an increase in cost.

本発明の第1の課題解決手段は、車両の前後左右の車輪に設けた車速センサにより車輪速度を検出する車輪速度検出手段と、前記車輪速度検出手段で検出した前記車輪速度により、前記車両にアンダーステア特性が発生しない低速モードか、前記車両にアンダーステア特性が発生する高速モードか、を判定する走行モード判定手段と、前後の前記車輪とも、前記低速モード時と前記高速モード時のいずれか一方のモード時の前記車輪の左右車輪速比を演算周期ごとに算出する車輪速比算出手段と、前後の前記車輪とも、現在演算周期で演算した前記低速モード時と前記高速モード時のいずれか一方のモード時の前記左右車輪速比と、過去演算周期で演算した他方のモード時の前記左右車輪速比との差を所定値と比較する車輪速比差比較手段とを備える構成である。
According to a first aspect of the present invention, there is provided a vehicle speed detection means for detecting a wheel speed by vehicle speed sensors provided on front, rear, left and right wheels of the vehicle, and the vehicle speed by the wheel speed detected by the wheel speed detection means. Driving mode determination means for determining whether the vehicle is in a low speed mode in which understeer characteristics do not occur or in a high speed mode in which the vehicle has understeer characteristics, and both the front and rear wheels are either in the low speed mode or in the high speed mode. Wheel speed ratio calculating means for calculating the right and left wheel speed ratio of the wheel at the time of the mode every calculation cycle, and both the front and rear wheels are either the low speed mode or the high speed mode calculated at the current calculation cycle. Wheel speed ratio difference comparison means for comparing a difference between the left and right wheel speed ratio in the mode and the left and right wheel speed ratio in the other mode calculated in the past calculation cycle with a predetermined value; It is configured to include.

また、本発明の第2の課題解決手段は、前記車輪速度検出手段の前記車輪速度により前記車両の車両速度を検出する車両速度検出手段と、前記車両速度検出手段の前記車両速度から車両加速度を検出する車両加速度検出手段と、を備え、前記走行モード判定手段は、前記車両速度が所定値以下で、前記車両加速度が所定値以下の場合は、前記低速モードと判定し、前記車両速度が所定値より大きく、前記車両加速度が所定値より大きい場合は、前記高速モードと判定する構成である。   According to a second aspect of the present invention, there is provided a vehicle speed detecting means for detecting a vehicle speed of the vehicle based on the wheel speed of the wheel speed detecting means, and a vehicle acceleration from the vehicle speed of the vehicle speed detecting means. Vehicle acceleration detecting means for detecting, when the vehicle speed is equal to or lower than a predetermined value and the vehicle acceleration is equal to or lower than the predetermined value, the driving mode determining means determines the low speed mode and the vehicle speed is predetermined. If the vehicle acceleration is greater than a predetermined value and greater than a predetermined value, the high-speed mode is determined.

また、本発明の第3の課題解決手段は、車両の前後左右の車輪に設けた車速センサにより車輪速度を検出する車輪速度検出ステップと、前記車輪速度検出ステップで検出した前記車輪速度により、前記車両にアンダーステア特性が発生しない低速モードか、前記車両にアンダーステア特性が発生する高速モードか、を判定する走行モード判定ステップと、前後の前記車輪とも、前記低速モード時と前記高速モード時に前記車輪の左右車輪速比を算出する車輪速比算出ステップと、前後の前記車輪とも、前記低速モード時と前記高速モード時の前記左右車輪速比の差を所定値と比較する車輪速比差比較ステップとを備える方法である。
The third problem solving means of the present invention includes a wheel speed detecting step for detecting a wheel speed by vehicle speed sensors provided on front, rear, left and right wheels of the vehicle, and the wheel speed detected in the wheel speed detecting step. A traveling mode determination step for determining whether the vehicle is in a low speed mode in which understeer characteristics do not occur or in a high speed mode in which the vehicle has understeer characteristics, and the front and rear wheels are both in the low speed mode and in the high speed mode. A wheel speed ratio calculating step for calculating a left / right wheel speed ratio, and a wheel speed ratio difference comparing step for comparing the difference between the left and right wheel speed ratios in the low speed mode and the high speed mode with a predetermined value for both the front and rear wheels. It is a method provided with.

本発明の車両用直進判定装置では、車輪速比差比較手段で前後の車輪とも、低速モード時の左右車輪速比と高速モード時の左右車輪速比との差を所定値と比較することで、直進判定を行う。ラウンドアバウトやオーバルコース等の一定方向の旋回が続く走行では、車両にアンダーステア特性が発生する高速モードとアンダーステア特性が発生しない低速モードとで車両の左右車輪速比に差が生じる。これに対して直進状態では、左右車輪速比に差が生じない。本発明ではこの特性を利用することで、車両の前後左右の車輪に設けた車速センサのみを使って、コストが高くなるのを抑制しつつ、直進判定の信頼度の高い直進判定装置を提供できる。   In the vehicle straight running determination device of the present invention, the wheel speed ratio difference comparison means compares the difference between the left and right wheel speed ratio in the low speed mode and the left and right wheel speed ratio in the high speed mode with a predetermined value for both the front and rear wheels. , Perform straight ahead judgment. When traveling in a certain direction such as roundabout or oval course, the vehicle has a difference in the left and right wheel speed ratio between the high speed mode in which the understeer characteristic occurs and the low speed mode in which the understeer characteristic does not occur. On the other hand, in the straight traveling state, there is no difference in the left and right wheel speed ratio. In the present invention, by using this characteristic, it is possible to provide a straight traveling determination device with high reliability of straight traveling determination while suppressing an increase in cost using only vehicle speed sensors provided on the front, rear, left and right wheels of the vehicle. .

また、走行モード判定手段は、車両速度が所定値以下で車両加速度が所定値以下の場合はアンダーステア特性が発生しない低速モードと判定し、車両速度が所定値より大きく、車両加速度が所定値より大きい場合はアンダーステア特性が発生する高速モードと判定する。通常の車両の挙動として、加速時にはアンダーステア、減速時にはオーバーステアとなるように設定されており、加速時と減速時に夫々で前輪又は後輪の左右車輪速比を検出することで、直進判定が可能になる。   The traveling mode determination means determines that the vehicle is in a low speed mode in which understeer characteristics do not occur when the vehicle speed is equal to or lower than a predetermined value and the vehicle acceleration is equal to or lower than the predetermined value, and the vehicle speed is higher than the predetermined value and the vehicle acceleration is higher than the predetermined value. In this case, it is determined that the mode is a high-speed mode in which understeer characteristics occur. Normal vehicle behavior is set to understeer when accelerating and oversteer when decelerating. By detecting the left / right wheel speed ratio of the front or rear wheels during acceleration and deceleration, straight travel can be determined. become.

また、本発明の車両用直進判定方法では、車輪速度検出ステップと、走行モード判定ステップと、車輪速比算出ステップと、車輪速比差比較ステップとを備えることで、車両の前後左右の車速センサのみを使って、コストが高くなるのを抑制しつつ、直進判定の信頼度の高い直進判定方法を提供できる。
Further, in the vehicle straight traveling determination method of the present invention, a vehicle speed sensor for front, rear, left and right of the vehicle includes a wheel speed detection step , a travel mode determination step, a wheel speed ratio calculation step, and a wheel speed ratio difference comparison step. It is possible to provide a straight traveling determination method with high reliability of straight traveling determination while suppressing an increase in cost.

本発明の車両の直進判定装置の概略を示す説明図である。It is explanatory drawing which shows the outline of the straight traveling determination apparatus of the vehicle of this invention. 本発明の車両の直進判定装置のメインプログラムで実行される直進判定のフローチャートである。It is a flowchart of the straight traveling determination performed by the main program of the vehicle straight traveling determination device of the present invention. 本発明の車両の直進判定装置のサブプログラムで実行される走行モード判定のフローチャートである。It is a flowchart of the driving mode determination performed by the subprogram of the vehicle straight traveling determination device of the present invention. 本発明の車両の直進判定装置のサブプログラムで実行される低速モード時車輪速比算出タイマ操作のフローチャートである。It is a flowchart of the wheel speed ratio calculation timer operation at the time of the low speed mode executed by the subprogram of the vehicle straight traveling determination device of the present invention. 本発明の車両の直進判定装置のサブプログラムで実行される低速モード時車輪速比算出のフローチャートである。It is a flowchart of the wheel speed ratio calculation at the time of the low speed mode performed with the subprogram of the straight traveling determination apparatus of the vehicle of this invention. 本発明の車両の直進判定装置のサブプログラムで実行される直進判定時処理のフローチャートである。It is a flowchart of the process at the time of the straight travel determination performed by the subprogram of the straight travel determination apparatus of the vehicle of this invention.

以下、本発明の車両1の直進判定装置5について図面を用いて詳述する。   Hereinafter, the straight traveling determination device 5 of the vehicle 1 according to the present invention will be described in detail with reference to the drawings.

図1は、本発明の実施形態に係る車両1の直進判定装置5の概略を示す説明図である。車両1には、車両1の右前に車輪2a、左前に車輪2b、右後に車輪2c、左後に車輪2dが配置されている。ここで前輪は車輪2a、2bであり、後輪は車輪2c、2dである。前輪には図示しない等速ジョイント等を介して駆動源3からの駆動力が伝達され、車両1の旋回時には、図示しない操舵機構によって旋回中心Oを中心に操舵される。車輪2aには回転センサ4a(速度センサ)、車輪2bには回転センサ4b(速度センサ)、車輪2cには回転センサ4c(速度センサ)、車輪2dには回転センサ4d(速度センサ)が夫々設けられている。回転センサ4a〜4dは、電磁ピックアップ又はホールICで構成され、前後左右の車輪2a〜2dの各々の回転角速度に比例したパルス数の回転パルス信号を発生させる。回転パルス信号は、直進判定装置5に送られる。   FIG. 1 is an explanatory diagram showing an outline of a straight traveling determination device 5 for a vehicle 1 according to an embodiment of the present invention. In the vehicle 1, a wheel 2a is disposed on the right front side of the vehicle 1, a wheel 2b on the left front side, a wheel 2c on the right side, and a wheel 2d on the left side. Here, the front wheels are wheels 2a and 2b, and the rear wheels are wheels 2c and 2d. A driving force from the driving source 3 is transmitted to the front wheels through a constant velocity joint (not shown), and the vehicle 1 is steered around a turning center O by a steering mechanism (not shown) when the vehicle 1 turns. The wheel 2a is provided with a rotation sensor 4a (speed sensor), the wheel 2b is provided with a rotation sensor 4b (speed sensor), the wheel 2c is provided with a rotation sensor 4c (speed sensor), and the wheel 2d is provided with a rotation sensor 4d (speed sensor). It has been. The rotation sensors 4a to 4d are configured by electromagnetic pickups or Hall ICs, and generate rotation pulse signals having a pulse number proportional to the rotation angular velocities of the front and rear wheels 2a to 2d. The rotation pulse signal is sent to the straight traveling determination device 5.

直進判定装置5は、四輪車輪速度検出(車両速度検出)、車両速度検出、車両加速度検出、走行モード判定、低速モード時算出タイマ操作、低速モード時車輪速比算出(車輪速比算出)、高速モード時算出タイマ操作、高速モード時車輪速比算出(車輪速比算出)、前輪車輪速比差比較(車輪速比差比較)、後輪車輪速比差比較(車輪速比差比較)、直進判定時処理の各手段を備える。
The straight traveling determination device 5 includes four-wheel wheel speed detection (vehicle speed detection) , vehicle speed detection, vehicle acceleration detection, travel mode determination, low speed mode calculation timer operation, low speed mode wheel speed ratio calculation (wheel speed ratio calculation), High-speed mode calculation timer operation, high-speed mode wheel speed ratio calculation (wheel speed ratio calculation), front wheel wheel speed ratio difference comparison (wheel speed ratio difference comparison), rear wheel wheel speed ratio difference comparison (wheel speed ratio difference comparison), Each means of straight traveling determination time processing is provided.

本発明の直進判定方法について図2〜図6のフローチャートに沿って説明する。   The straight traveling determination method of the present invention will be described with reference to the flowcharts of FIGS.

図2は、本発明の車両1の直進判定装置5のメインプログラムで実行される直進判定のフローチャートである。まず、四輪車輪速度検出ステップS10では、車両1の前後左右の車輪2a〜2dに設けた回転センサ4a〜4dからの回転パルス信号により、車輪2a〜2dの夫々の車輪速度を検出する。次に車両速度検出ステップS11では、四輪車輪速度検出ステップS10での車輪速度より車両1の速度を検出する。次に車両加速度検出ステップS12では、車両速度検出ステップS11の車両速度より車両1の加速度を検出する。
FIG. 2 is a flowchart of the straight-ahead determination executed by the main program of the straight-ahead determination device 5 for the vehicle 1 according to the present invention. First, in the four-wheel wheel speed detection step S10 , the wheel speeds of the wheels 2a to 2d are detected based on rotation pulse signals from the rotation sensors 4a to 4d provided on the front and rear wheels 2a to 2d of the vehicle 1. Next, in vehicle speed detection step S11, the speed of the vehicle 1 is detected from the wheel speed in four-wheel wheel speed detection step S10. Next, in vehicle acceleration detection step S12, the acceleration of the vehicle 1 is detected from the vehicle speed of vehicle speed detection step S11.

走行モード判定ステップS13では、車両1にアンダーステア特性が発生しない低速モードか、車両1にアンダーステア特性が発生する高速モードか、低速モード・高速モードのいずれでもない不定モードかを判定する。低速モードの場合には、低速モード時算出タイマ操作ステップS14にて、タイマ操作を行い、低速モード時車輪速比算出ステップS15で低速モード時の前輪と後輪の前後の左右車輪速比を算出する。高速モードの場合には、高速モード時算出タイマ操作ステップS16にて、タイマ操作を行い、高速モード時車輪速比算出ステップS17で、高速モード時の前輪と後輪の左右車輪速比を算出する。不定モードの場合には、処理を終了する。   In the traveling mode determination step S13, it is determined whether the vehicle 1 is in a low speed mode in which understeer characteristics are not generated, in a high speed mode in which the vehicle 1 generates understeer characteristics, or indefinite mode in which neither the low speed mode nor the high speed mode is set. In the low speed mode, the timer is operated in the low speed mode calculation timer operation step S14, and the front and rear wheel speed ratios of the front and rear wheels in the low speed mode are calculated in the low speed mode wheel speed ratio calculation step S15. To do. In the high speed mode, the timer is operated in the high speed mode calculation timer operation step S16, and the right and left wheel speed ratios of the front and rear wheels in the high speed mode are calculated in the high speed mode wheel speed ratio calculation step S17. . If the mode is indefinite, the process ends.

前輪車輪速比差比較ステップS18では、現在演算周期で演算した前記低速モード時と前記高速モード時のいずれか一方のモード時の前輪左右車輪速比と、過去演算周期で演算した他方のモード時の前輪左右車輪速比との差を所定値1 と比較する。所定値1 以下の場合には、後輪車輪速比差比較ステップS19に送られ、所定値1より大きい場合には、処理を終了する。後輪車輪速比差比較ステップS19では、現在演算周期で演算した前記低速モード時と前記高速モード時のいずれか一方のモード時の後輪左右車輪速比と、過去演算周期で演算した他方のモード時の後輪左右車輪速比との差を所定値2と比較する。所定値2以下の場合には、直進判定時処理ステップS20に送られ、所定値2 より大きい場合には、処理を終了する。この直進判定処理は、マイコンソフトの演算周期ごとに実施される。
In the front wheel speed ratio difference comparison step S18, the front wheel left and right wheel speed ratio in either one of the low speed mode and the high speed mode calculated in the current calculation cycle and the other mode calculated in the past calculation cycle. The difference between the front wheel left and right wheel speed ratio is compared with a predetermined value 1. If it is less than the predetermined value 1, it is sent to the rear wheel speed ratio comparison step S19. If it is larger than the predetermined value 1, the process is terminated. In the rear wheel wheel speed ratio difference comparison step S19, the rear wheel left and right wheel speed ratio in either one of the low speed mode and the high speed mode calculated in the current calculation cycle and the other wheel calculated in the past calculation cycle. The difference between the rear wheel right and left wheel speed ratio in the mode is compared with a predetermined value 2. If it is less than the predetermined value 2, it is sent to the straight forward determination processing step S20. If it is larger than the predetermined value 2, the process is terminated. This straight-ahead determination process is performed every calculation period of the microcomputer software.

図3は、本発明の車両1の直進判定装置5のサブプログラムで実行される走行モード判定ステップS13のフローチャートである。走行モード判定ステップS13では、ステップ131で車輪2a〜2dの四輪夫々の車輪速度がゼロでないか判定する。四輪車輪速度がゼロでない場合は、ステップS132に進み、四輪車輪速度がゼロの場合は、不定モードとして、処理を終了する。ステップS132では、車両速度と所定値3とを比較する。車両速度が所定値3以下の場合には、ステップS133に進み、車両速度が所定値3より大きい場合には、ステップ134に進む。ステップS133では、車両加速度と所定値4とを比較する。車両加速度が所定値4以下の場合には、低速モードと判定し、車両加速度が所定値4より大きい場合には、不定モードと判定する。ステップ134では、車両速度と所定値5とを比較する。車両速度が所定値5以上の場合には、ステップS135に進み、車両速度が所定値5より小さい場合には、不定モードと判定する。ステップS135では、車両加速度と所定値6とを比較する。車両加速度が所定値6以上の場合には、高速モードと判定し、車両加速度が所定値6より小さい場合には、不定モードと判定する。   FIG. 3 is a flowchart of the traveling mode determination step S13 executed by the subprogram of the straight traveling determination device 5 of the vehicle 1 of the present invention. In travel mode determination step S13, it is determined in step 131 whether the wheel speeds of the four wheels 2a to 2d are not zero. If the four-wheel wheel speed is not zero, the process proceeds to step S132. If the four-wheel wheel speed is zero, the process is terminated as an indefinite mode. In step S132, the vehicle speed is compared with a predetermined value 3. If the vehicle speed is less than or equal to the predetermined value 3, the process proceeds to step S133. If the vehicle speed is greater than the predetermined value 3, the process proceeds to step 134. In step S133, the vehicle acceleration is compared with a predetermined value 4. When the vehicle acceleration is equal to or less than the predetermined value 4, it is determined as the low speed mode, and when the vehicle acceleration is greater than the predetermined value 4, it is determined as the indefinite mode. In step 134, the vehicle speed is compared with a predetermined value 5. When the vehicle speed is greater than or equal to the predetermined value 5, the process proceeds to step S135, and when the vehicle speed is less than the predetermined value 5, the indeterminate mode is determined. In step S135, the vehicle acceleration is compared with a predetermined value 6. When the vehicle acceleration is a predetermined value 6 or more, it is determined as the high speed mode, and when the vehicle acceleration is smaller than the predetermined value 6, it is determined as the indefinite mode.

車両1は、旋回中の遠心力が大きいほどアンダーステアが発生しやすくなる。遠心力は、(遠心力)=(質量)×(車両速度)^2/(旋回半径)で表されるため、車両速度が高くなるほど大きい。従って、アンダーステアは、車両速度が高いほど発生しやすくなる。また、アンダーステアは、タイヤ特性とサスペンション特性とによって発生するが、タイヤ特性によるものは、前輪荷重が大きいほど発生しやすくなるのに対して、サスペンション特性によるものは、サスペンション設定によって前輪荷重が大きいほど発生しやすい場合と、後輪荷重が大きいほど発生しやすい場合とがある。通常車両1は、加速中つまり後輪荷重が大きい時に、サスペンション特性によってアンダーステアとなるように設定されており、タイヤグリップ力が限界付近でない限り、タイヤ特性によるアンダーステアは支配的ではない。従って、車両速度が小で車両加速度が小のときは、旋回中にアンダーステア状態ではない低速モードと判定でき、車両速度が大で車両加速度が大のときは、旋回中にアンダーステア状態となる高速モードと判定できる。   In the vehicle 1, understeer is more likely to occur as the centrifugal force during turning increases. Since the centrifugal force is expressed by (centrifugal force) = (mass) × (vehicle speed) ^ 2 / (turning radius), it increases as the vehicle speed increases. Therefore, understeer is more likely to occur as the vehicle speed increases. Understeer occurs due to tire characteristics and suspension characteristics, but tire characteristics are more likely to occur as the front wheel load is larger, whereas those due to suspension characteristics are greater as the front wheel load is greater depending on the suspension setting. There are cases where it tends to occur, and cases where it tends to occur as the rear wheel load increases. Normally, the vehicle 1 is set to be understeered due to suspension characteristics when accelerating, that is, when the rear wheel load is large, and understeer due to tire characteristics is not dominant unless the tire grip force is near the limit. Therefore, when the vehicle speed is low and the vehicle acceleration is low, it can be determined that the low-speed mode is not understeer during turning, and when the vehicle speed is high and the vehicle acceleration is high, the high-speed mode is understeered during turning. Can be determined.

図4は、直進判定装置5のサブプログラムで実行される低速モード時算出タイマ操作ステップS14のフローチャートである。ステップS1410では、前回走行モードが低速モードか否かを判定し、低速モードの場合はS1411に進み、低速モードでない場合はS1422に進む。ステップS1411では、(低速モード時前輪極大値)<(前輪左右車輪速比)の場合には、ステップS1412で(低速モード時前輪極大値)=(前輪左右車輪速比)とする。ステップS1413では、(低速モード時前輪極小値)>(前輪左右車輪速比)の場合には、ステップS1414で(低速モード時前輪極小値)=(前輪左右車輪速比)とする。ステップS1415では、(低速モード時後輪極大値)<(後輪左右車輪速比)の場合には、ステップS1416で(低速モード時後輪極大値)=(後輪左右車輪速比)とする。ステップS1417では、(低速モード時後輪極小値)>(後輪左右車輪速比)の場合には、ステップS1418で(低速モード時後輪極小値)=(後輪左右車輪速比)とする。ステップS1419で[(前輪極大値)−(後輪極大値)]<(所定値7)の場合には、ステップ1420に進み、異なる場合はステップS1422に進む。ステップ1420で[(後輪極大値)−(後輪極大値)]<(所定値8)の場合には、タイマインクリメント後低速モード時算出タイマ操作を終了し、異なる場合はステップS1422に進む。   FIG. 4 is a flowchart of the low-speed mode calculation timer operation step S14 executed by the subprogram of the straight traveling determination device 5. In step S1410, it is determined whether or not the previous travel mode is the low speed mode. If it is the low speed mode, the process proceeds to S1411. If not, the process proceeds to S1422. In step S1411, if (front wheel maximum value in low speed mode) <(front wheel left and right wheel speed ratio), in step S1412, (front wheel maximum value in low speed mode) = (front wheel left and right wheel speed ratio). In step S1413, if (minimum front wheel value in low speed mode)> (front wheel left and right wheel speed ratio), in step S1414, (front wheel minimum value in low speed mode) = (front wheel left and right wheel speed ratio). In step S1415, if (rear wheel maximum value in low speed mode) <(rear wheel left and right wheel speed ratio), in step S1416, (rear wheel maximum value in low speed mode) = (rear wheel left and right wheel speed ratio). . In step S1417, if (rear wheel rear wheel minimum value in low speed mode)> (rear wheel left and right wheel speed ratio), in step S1418 (rear wheel rear wheel minimum value in low speed mode) = (rear wheel left and right wheel speed ratio). . If [(front wheel maximum value) − (rear wheel maximum value)] <(predetermined value 7) in step S1419, the process proceeds to step 1420. Otherwise, the process proceeds to step S1422. If [(rear wheel maximum value) − (rear wheel maximum value)] <(predetermined value 8) in step 1420, the low-speed mode calculation timer operation is terminated after the timer increment, and if different, the process proceeds to step S1422.

ステップ1422では、(低速モード時前輪極大値)=(前輪左右車輪速比)とし、ステップ1423では、(低速モード時前輪極小値)=(前輪左右車輪速比)とし、ステップ1424では、(低速モード時後輪極大値)=(後輪左右車輪速比)とし、ステップ1425では、(低速モード時後輪極大値)=(後輪左右車輪速比)とし、ステップ1426では、低速モード時算出タイマクリアを実行し、処理を終了する。高速モード時算出タイマ操作ステップS16も同様である。   In step 1422, (front wheel maximum value in low speed mode) = (front wheel left and right wheel speed ratio), in step 1423, (front wheel minimum value in low speed mode) = (front wheel left and right wheel speed ratio), and in step 1424 (low speed) (Rear wheel maximum value in mode) = (rear wheel left and right wheel speed ratio), and in step 1425, (rear wheel maximum value in low speed mode) = (rear wheel left and right wheel speed ratio), and in step 1426, calculation in the low speed mode. Execute timer clear and end processing. The same applies to the high-speed mode calculation timer operation step S16.

図5は、直進判定装置5のサブプログラムで実行される低速モード時車輪速比算出ステップS15のフローチャートである。ステップS151で、(低速モード時左右車輪速比算出タイマ)>(所定値9)の場合はステップ152に進み、異なる場合は処理を終了する。ステップ152では、(低速モード時前輪左右車輪速比)=[(低速モード時前輪極大値)+(低速モード時前輪極小値)]/2とし、ステップS153では、(低速モード時後輪左右車輪速比)=[(低速モード時後輪極大値)+(低速モード時後輪極小値)]/2とする。ステップS154では、(低速モード時前輪極大値)=(前輪左右車輪速比)とする。ステップS155では、(低速モード時前輪極小値)=(前輪左右車輪速比)とする。ステップS156では、(低速モード時後輪極大値)=(後輪左右車輪速比)とする。ステップS157では、(低速モード時後輪極小値)=(後輪左右車輪速比)とする。ステップS158では、低速モード時左右車輪速比算出タイマクリアを実行して、ステップS159で、(直進判定トライフラグ)=ONにする。高速モード時車輪速比算出ステップS17も同様である。   FIG. 5 is a flowchart of the wheel speed ratio calculation step S15 in the low speed mode executed by the subprogram of the straight traveling determination device 5. If (Slow-speed mode left / right wheel speed ratio calculation timer)> (predetermined value 9) in step S151, the process proceeds to step 152. If not, the process ends. In step 152, (the front wheel left and right wheel speed ratio in the low speed mode) = [(the front wheel maximum value in the low speed mode) + (the front wheel minimum value in the low speed mode)] / 2, and in the step S153, the (rear wheel left and right wheels in the low speed mode) Speed ratio) = [(rear wheel maximum value in low speed mode) + (rear wheel minimum value in low speed mode)] / 2. In step S154, (front wheel maximum value in low speed mode) = (front wheel right and left wheel speed ratio). In step S155, (low wheel mode front wheel local minimum value) = (front wheel right / left wheel speed ratio). In step S156, (the rear wheel maximum value in the low speed mode) = (rear wheel left and right wheel speed ratio). In step S157, (rear wheel minimum value in low speed mode) = (rear wheel right and left wheel speed ratio) is set. In step S158, the left / right wheel speed ratio calculation timer clear in the low speed mode is executed, and in step S159, (straight-running determination tri flag) is set to ON. The same applies to the high speed mode wheel speed ratio calculating step S17.

図6は、直進判定装置5のサブプログラムで実行される直進判定時処理ステップS20のフローチャートである。ステップ201では、(直進判定トライフラグ)=ONの場合、ステップS202に進み、異なる場合は処理を終了する。ステップS202で、(直進判定回数n)=0の場合、ステップ203に進み、異なる場合はステップ205に進む。ステップ203では、(直進時前輪左右車輪速比)=[(低速モード時前輪左右車輪速比)+(高速モード時前輪左右車輪速比)]/2とし、ステップ204では、(直進時後輪左右車輪速比)=[(低速モード時後輪左右車輪速比)+(高速モード時後輪左右車輪速比)]/2とする。ステップS205では、(直進時前輪左右車輪速比)=[{(前回直進時前輪左右車輪速比)×(所定値10)}+{(低速モード時前輪左右車輪速比)+(高速モード時前輪左右車輪速比)}/2×(所定値11)]/[(所定値10)+(所定値11)]とし、ステップ206では、(直進時後輪左右車輪速比)=[{(前回直進時後輪左右車輪速比)×(所定値12)}+{(低速モード時後輪左右車輪速比)+(高速モード時後輪左右車輪速比)}/2×(所定値13)]/[(所定値12)+(所定値13)]とする。ステップ207では、(直進判定回数インクリメント)=(n+1)とし、ステップ208で、(直進判定トライフラグ)=OFFとして、処理を終了する。   FIG. 6 is a flowchart of the straight-running determination processing step S20 executed by the subprogram of the straight-running determination device 5. In step 201, if (straight-run determination trie flag) = ON, the process proceeds to step S202, and if different, the process ends. If (straight-running determination number n) = 0 in step S202, the process proceeds to step 203, and if different, the process proceeds to step 205. In step 203, (right wheel front wheel left / right wheel speed ratio in straight running) = [(front wheel left / right wheel speed ratio in low speed mode) + (front wheel left / right wheel speed ratio in high speed mode)] / 2, and in step 204 (rear wheel in straight running) Left / right wheel speed ratio) = [(rear wheel left / right wheel speed ratio in low speed mode) + (rear wheel left / right wheel speed ratio in high speed mode)] / 2. In step S205, (right wheel front wheel left / right wheel speed ratio during straight travel) = [{(front wheel front wheel left / right wheel speed ratio during previous straight travel) × (predetermined value 10)} + {(front wheel left / right wheel speed ratio during low speed mode) + (high speed mode) Front wheel left / right wheel speed ratio)} / 2 × (predetermined value 11)] / [(predetermined value 10) + (predetermined value 11)], and in step 206, (rear wheel right / left wheel speed ratio when traveling straight) = [{( Rear wheel left / right wheel speed ratio during straight forward) × (predetermined value 12)} + {(rear wheel left / right wheel speed ratio in low speed mode) + (rear wheel left / right wheel speed ratio in high speed mode)} / 2 × (predetermined value 13) )] / [(Predetermined value 12) + (predetermined value 13)]. In step 207, (increment in the number of straight-running determinations) = (n + 1), and in step 208, (straight-running determination tri-flag) = OFF, and the process ends.

直進判定装置5では、前輪車輪速比差比較手段と後輪車輪速比差比較手段とで低速モード時の左右車輪速比と高速モード時の左右車輪速比との差を所定値1、2と比較することで、直進判定を行う。ラウンドアバウトやオーバルコース等の一定方向の旋回が続く走行では、車両1にアンダーステア特性が発生する高速モードとアンダーステア特性が発生しない低速モードとで車両1の前後の左右車輪速比に差が生じる。これに対して直進状態では、前後の左右車輪速比に差が生じない。この特性を利用することで、車両1の左右の車輪2a〜2dに設けた回転センサ4a〜4dのみを使って、コストが高くなるのを抑制しつつ、直進判定の信頼度の高い直進判定装置5を提供できる。   In the straight traveling determination device 5, the difference between the left and right wheel speed ratio in the low speed mode and the left and right wheel speed ratio in the high speed mode is set to a predetermined value 1, 2 between the front wheel speed ratio difference comparing means and the rear wheel speed ratio comparing means. To make a straight-ahead determination. When traveling in a certain direction such as roundabout or oval course, the left and right wheel speed ratios before and after the vehicle 1 are different between a high speed mode in which the vehicle 1 has understeer characteristics and a low speed mode in which no understeer characteristics occur. On the other hand, in the straight traveling state, there is no difference between the front and rear left and right wheel speed ratios. By using this characteristic, only the rotation sensors 4a to 4d provided on the left and right wheels 2a to 2d of the vehicle 1 are used, and the straight traveling determination device with high reliability of the straight traveling determination is suppressed while suppressing an increase in cost. 5 can be provided.

また、走行モード判定手段は、車両速度が所定値以下で車両加速度が所定値以下の場合はアンダーステア特性が発生しない低速モードと判定し、車両速度が所定値より大きく、車両加速度が所定値より大きい場合はアンダーステア特性が発生する高速モードと判定する。車両1の挙動として、加速時にはアンダーステア、減速時にはオーバーステアとなるように設定されており、加速時と減速時に夫々で前輪又は後輪の左右車輪速比を検出することで、直進判定が可能になる。   The traveling mode determination means determines that the vehicle is in a low speed mode in which understeer characteristics do not occur when the vehicle speed is equal to or lower than a predetermined value and the vehicle acceleration is equal to or lower than the predetermined value, and the vehicle speed is higher than the predetermined value and the vehicle acceleration is higher than the predetermined value. In this case, it is determined that the mode is a high-speed mode in which understeer characteristics occur. The behavior of the vehicle 1 is set to be understeer when accelerating and oversteering when decelerating. By detecting the left / right wheel speed ratio of the front or rear wheels during acceleration and deceleration, it is possible to determine straight ahead Become.

また、直進判定方法では、四輪車輪速度検出ステップS10と、走行モード判定ステップS13と、低速モード時車輪速比算出ステップS15と、高速モード時車輪速比算出ステップS17と、前輪車輪速比差比較ステップS18と、後輪車輪速比差比較ステップS19とを備えることで、車両1の前後左右の車輪2a〜2dの回転センサ4a〜4dのみを使って、コストが高くなるのを抑制しつつ、直進判定の信頼度の高い直進判定方法を提供できる。
Further, in the straight traveling determination method, the four wheel speed detection step S10 , the traveling mode determination step S13, the low speed mode wheel speed ratio calculation step S15, the high speed mode wheel speed ratio calculation step S17, and the front wheel speed ratio difference. By providing the comparison step S18 and the rear wheel speed ratio difference comparison step S19, it is possible to suppress an increase in cost by using only the rotation sensors 4a to 4d of the front and rear wheels 2a to 2d of the vehicle 1. Therefore, it is possible to provide a straight traveling determination method with high reliability of straight traveling determination.

1 車両
2a〜2d 車輪
4a〜4d 回転センサ(車速センサ)
5 直進判定装置
S10 四輪車輪速度検出ステップ(車輪速度検出ステップ)
S11 車両速度検出ステップ
S12 車両加速度検出ステップ
S13 走行モード判定ステップ
S15 低速モード時車輪速比算出ステップ
S17 高速モード時車輪速比算出ステップ
S18 前輪車輪速比差比較ステップ
S19 後輪車輪速比差比較ステップ
1 vehicle
2a ~ 2d wheels
4a to 4d Rotation sensor (vehicle speed sensor)
5 Straight ahead judging device
S10 four-wheel wheel speed detection step (wheel speed detection step)
S11 Vehicle speed detection step
S12 vehicle acceleration detection step
S13 Driving mode determination step
S15 Wheel speed ratio calculation step in low speed mode
S17 High-speed mode wheel speed ratio calculation step
S18 Front wheel speed ratio difference comparison step
S19 Rear wheel speed ratio comparison step

Claims (3)

車両の前後左右の車輪に設けた車速センサにより車輪速度を検出する車輪速度検出手段と、
前記車輪速度検出手段で検出した前記車輪速度により、前記車両にアンダーステア特性が発生しない低速モードか、前記車両にアンダーステア特性が発生する高速モードか、を判定する走行モード判定手段と、
前後の前記車輪とも、前記低速モード時と前記高速モード時のいずれか一方のモード時の前記車輪の左右車輪速比を演算周期ごとに算出する車輪速比算出手段と、
前後の前記車輪とも、現在演算周期で演算した前記低速モード時と前記高速モード時のいずれか一方のモード時の前記左右車輪速比と、過去演算周期で演算した他方のモード時の前記左右車輪速比との差を所定値と比較する車輪速比差比較手段と
を備える車両の直進判定装置。
Wheel speed detection means for detecting wheel speed by vehicle speed sensors provided on front, rear, left and right wheels of the vehicle;
Travel mode determination means for determining whether the vehicle is in a low speed mode in which an understeer characteristic is not generated or a high speed mode in which an understeer characteristic is generated in the vehicle, based on the wheel speed detected by the wheel speed detection means;
Wheel speed ratio calculation means for calculating the left and right wheel speed ratio of the wheel in either one of the low-speed mode and the high-speed mode for each calculation cycle for both the front and rear wheels,
For both the front and rear wheels, the left and right wheel speed ratio in one of the low speed mode and the high speed mode calculated in the current calculation cycle, and the left and right wheels in the other mode calculated in the past calculation cycle A straight traveling determination device for a vehicle, comprising: wheel speed ratio difference comparison means for comparing a difference with a speed ratio with a predetermined value.
前記車輪速度検出手段の前記車輪速度により前記車両の車両速度を検出する車両速度検出手段と、
前記車両速度検出手段の前記車両速度から車両加速度を検出する車両加速度検出手段と、を備え、
前記走行モード判定手段は、前記車両速度が所定値以下で、前記車両加速度が所定値以下の場合は、前記低速モードと判定し、前記車両速度が所定値より大きく、前記車両加速度が所定値より大きい場合は、前記高速モードと判定する
ことを特徴とする請求項1 に記載の車両の直進判定装置。
Vehicle speed detecting means for detecting the vehicle speed of the vehicle based on the wheel speed of the wheel speed detecting means;
Vehicle acceleration detection means for detecting vehicle acceleration from the vehicle speed of the vehicle speed detection means,
The travel mode determination means determines the low speed mode when the vehicle speed is equal to or lower than a predetermined value and the vehicle acceleration is equal to or lower than the predetermined value, the vehicle speed is higher than a predetermined value, and the vehicle acceleration is higher than a predetermined value. The vehicle straight traveling determination device according to claim 1, wherein if it is larger, the high-speed mode is determined.
車両の前後左右の車輪に設けた車速センサにより車輪速度を検出する車輪速度検出ステップと、
前記車輪速度検出ステップで検出した前記車輪速度により、前記車両にアンダーステア特性が発生しない低速モードか、前記車両にアンダーステア特性が発生する高速モードか、を判定する走行モード判定ステップと、
前後の前記車輪とも、前記低速モード時と前記高速モード時のいずれか一方のモード時の前記車輪の左右車輪速比を演算周期ごとに算出する車輪速比算出ステップと、
前後の前記車輪とも、現在演算周期で演算した前記低速モード時と前記高速モード時のいずれか一方のモード時の前記左右車輪速比と、過去演算周期で演算した他方のモード時の前記左右車輪速比との差を所定値と比較する車輪速比差比較ステップと
を備える車両の直進判定方法。
A wheel speed detecting step for detecting a wheel speed by vehicle speed sensors provided on front, rear, left and right wheels of the vehicle;
A traveling mode determination step for determining, based on the wheel speed detected in the wheel speed detection step, whether the vehicle is in a low speed mode in which an understeer characteristic is not generated or a high speed mode in which an understeer characteristic is generated in the vehicle;
A wheel speed ratio calculating step for calculating the left and right wheel speed ratio of the wheel in either one of the low speed mode and the high speed mode for each calculation cycle for both the front and rear wheels,
For both the front and rear wheels, the left and right wheel speed ratio in one of the low speed mode and the high speed mode calculated in the current calculation cycle, and the left and right wheels in the other mode calculated in the past calculation cycle A vehicle straight traveling determination method comprising: a wheel speed ratio difference comparison step for comparing a difference with a speed ratio with a predetermined value.
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