DRIVE SUPPORT DEVICE OF VEHICLE

• Main Authors: YAMADA TAKUO, NAKATANI TERUHIRO
• Format: Patent
• Language: English; Japanese
• Published: 01.11.2021
• Subjects: ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE ORDIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; PERFORMING OPERATIONS; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OFVEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TOTHE CONTROL OF A PARTICULAR SUB-UNIT; TRANSPORTING; VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES; VEHICLES IN GENERAL

To appropriately start pre-fill control (pre-load control).SOLUTION: When a preceding vehicle is detected and vehicle velocity Vn is less than pre-fill execution vehicle velocity Vpre, driving support ECU 10 calculates TT target inter-vehicle X (=inter-vehicle deviation ΔD/preceding vehicle relative velocity Vr). The TT target inter-vehicle X represents a temporal allowance required for the inter-vehicle distance to reach a target inter-vehicle distance. When the TT target inter-vehicle X is reduced to a pre-fill start threshold Xpre or less, the driving support ECU 10 transmits a pre-fill control start request to a brake ECU 40 on the conditions that the preceding vehicle relative velocity Vr is equal to or less than a preceding vehicle relative velocity threshold Vrth and preceding vehicle relative acceleration Ar is equal to or less than a preceding vehicle relative acceleration threshold Arth.SELECTED DRAWING: Figure 2 【課題】 プリフィル制御（予圧制御）を適正に開始する。【解決手段】 運転支援ＥＣＵ１０は、先行車両が検知され、車速Ｖｎがプレフィル実施車速Ｖpre未満である場合、ＴＴ目標車間Ｘ（＝車間偏差ΔＤ／先行車相対速度Ｖｒ）を演算する。ＴＴ目標車間Ｘは、目標車間距離に到達するまでに要する時間的な余裕度を表す。運転支援ＥＣＵ１０は、ＴＴ目標車間Ｘがプレフィル開始閾値Ｘpre以下にまで低下した場合、先行車相対速度Ｖｒが先行車相対速度閾値Ｖｒth以下であり、かつ、先行車相対加速度Ａｒが先行車相対加速度閾値Ａｒth以下であることを条件として、プリフィル制御開始要求をブレーキＥＣＵ４０に送信する。【選択図】 図２