Photo Daihatsu New Tanto
Overthrow N-BOX and Daihatsu Tanto have been partially improved and advanced equipment has been greatly improved!Take the champion of the Super Height Wagon ...
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With this improvement, Tanto will follow the preceding vehicle while keeping any speed and inter-vehicle distance, and the adaptive cruise control will work even in heavy traffic.
The most popular category of mini vehicles is the super height wagon model.The first is Honda N-BOX ... → Continue reading
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Adaptive cruise control
Adaptive cruise control(English: Adaptive cruise control, Abbreviation: ACC) orConstant speed driving / inter-vehicle distance control deviceAutomatically adjusts vehicle speed to maintain a safe distance from the vehicle in frontAdvanced driving support systemWas additionally implementedCruise controlIs.The name is different for each manufacturer, and "Intelligent cruise control"(Nissan), "Radar cruise control"(Toyota), "Cruise control with all vehicle speed tracking function"(SUBARU) Etc.It is also called "dynamic cruise control" overseas..
Various controls installedSensorSensor from情报Is based on.Such a systemradar,laserSensor, orカメラWhen it detects that a vehicle is approaching another vehicle in front of it, it decelerates by braking or downshifting to follow the preceding vehicle.When the preceding vehicle disappears, it accelerates to the set vehicle speed and runs at a constant speed.
ACC technology is the next generationIntelligent carIt is widely regarded as an important component of.These are the drivers安全 性Not only does it provide convenience, but it also maintains the optimum distance from the vehicle in front and reduces sudden approaches and rear-end collisions by the driver.Vehicles with adaptive cruise controlSAE InternationalDefined by,Collision damage reduction brakeLevel 1 equipped with etc.Self-driving carIs.Combined with other advanced driving features such as, the vehicle will be able to drive at level 2 partially autonomously.The adaptive cruise control system provides some assistance to the driver, but does not drive the vehicle itself..
- 1992:MitsubishiIt is,DebonairToTO DEALIt was the first to offer a base distance detection system in the Japanese market. Sold as a "distance warning", this system warns the driver without affecting throttle, brakes or gearshifts..
- 1995:Mitsubishi Diamante laserAnnounced "Preview Distance Control" that introduced.The system controlled speed by throttle control and downshift rather than braking..
- 1997:Toyota TheToyota CelsiorProvided "Laser Adaptive Cruise Control" (rider) system..Instead of applying the brakes, I controlled the speed with throttle control and downshift.
- 1999:メ ル セ デ スIs the first radar-assisted ACC, "Distronic"Mercedes-Benz W221 Introduced to CL class.
- 1999:ジ ャ ガ ー TheLaunched radar-based ACC system at.
- 1999:Nissan MotorIt is,CimaIntroduced laser ACC in.
- 1999:Fuji Heavy Industries(Currently SUBARU)Subaru LegacyAnnounced the world's first camera-based ACC to Lancaster.
- 2000: ToyotaLexus LS430Introduced the first dynamic laser cruise control system equipped with laser ACC in the US market in the latter half of 2000..
- 2000: Toyota's laser ACC system adds "brake control" that also applies brakes.
- 2001:InfinityOf 2002Infiniti Q45Introduced "intelligent cruise control" to the 3rd generation F50 and the 2002 Infinity QX4.
- 2003: Toyota shifts from laser to radar ACC at Celsior..First Lexus Dynamic Radar Cruise Control and Radar GuidanceCollision damage reduction brake Lexus LS(XF30) was remodeled and introduced in the US market.
- 2004: ToyotaToyota Crown MajestaAdded "Slow Tracking Mode" to Radar ACC..Slow speed tracking mode is the second mode that alerts and brakes the driver when the vehicle in front stops.You can stop the car, but then become inactive.
- 2006: NissanfugueAnnounced "Intelligent Cruise Control with Distance Control Assist"..When the navigation system senses a dangerous speed, press the accelerator pedal against your foot.When using an adaptive cruise control system, distance control assistance automatically slows down and alerts the driver with a bell.
- 2006: September 2006 ToyotaLexus LS460Introduced "full speed tracking function"..Radar assist systems are designed to maintain continuous control at speeds from 0 km / h to 100 km / h and to function in stop / move situations such as highway traffic jams..
- 2015:HondaIs European with predictive cruise controlCR-VAnnounced 2015.
- 2017: Toyota equips all models with safety sense.Toyota Safety SenseThe ™ P (TSS-P) is designed with DRCC (Dynamic Radar Cruise Control), which uses a radar mounted on the front grille, to detect the vehicle in front and automatically adjust the speed of the vehicle. Includes a forward-looking camera.Maintain a preset distance to the vehicle in front.
how to use
The method of inputting commands from the driver is almost the same as that of conventional cruise control, but the situation of the own vehicle is adaptive because there is a limitation that adaptive cruise control cannot be activated when the forward monitoring subsystem cannot function. If it does not meet the operating requirements as cruise control, it will notify the driver and operate as conventional cruise control, but it will not operate as adaptive cruise control or conventional cruise control after issuing a warning. Some of them allow the driver to choose whether to operate as adaptive cruise control or as conventional cruise control at the time of setting.
The system determines the distance to the preceding vehicle based on the vehicle speed, etc., but it is generally possible to change the set value at the discretion of the driver (generally the system corrects from the viewpoint of ensuring safety). is there.
Settable speed range for adaptive cruise control (eg 40-110) km / h) exists, and if the speed of the own vehicle at the time of command input and the set speed are different, the operation is the same as the conventional cruise control, but if there is a preceding vehicle, the control is also performed considering the inter-vehicle distance. ..If the speed of the preceding vehicle is lower than the set speed of the own vehicle when the set inter-vehicle distance is reached, the speed of the preceding vehicle will follow instead of the set speed.
If the vehicle in front is not locked on (automatically tracked) even if the front monitoring subsystem is functioning, the control will be almost the same as the conventional cruise control, but from the front monitoring subsystem. Since the information evaluation of is continuing, if a new preceding vehicle is automatically tracked, it will shift to a control method unique to Adaptive Cruise Control.
Acceleration during adaptive cruise control
When it is determined from the information of the front monitoring subsystem that the inter-vehicle distance increases, the vehicle automatically accelerates and operates so as to maintain the set inter-vehicle distance. However, since the vehicle does not accelerate at a speed higher than the speed set by the driver, when the speed of the preceding vehicle exceeds the set speed, the rear-end vehicle distance increases. The inter-vehicle distance also increases when the acceleration of the preceding vehicle exceeds the acceleration of the own vehicle.
If the inter-vehicle distance continues to increase and the forward monitoring subsystem cancels automatic tracking, the set speed will be maintained as in conventional cruise control if it is within the settable speed range, and if it is lower than the set speed range, the vehicle speed will be maintained. It is common to lose control.
When the driver wants to actively intervene, the command input method is almost the same as the conventional cruise control except for the setting of the inter-vehicle distance.
Decelerate, stop and release during adaptive cruise control
If it is determined from the information in the forward monitoring subsystem that the inter-vehicle distance will decrease, the vehicle will automatically decelerate and operate to maintain the set inter-vehicle distance.If it is determined that deceleration by engine control is not enough, deceleration will be carried out by intervening in a braking device or the like.Therefore, when it is determined that the preceding vehicle is completely stopped and the distance between the vehicle and the vehicle is less than the specified value, the vehicle is automatically stopped.Regarding the behavior after stopping, there are those that keep the vehicle stopped and those that cancel the intervention in the braking device (therefore, in the case of an automatic vehicle, it shifts to creeping).Collision damage reduction brakereference.
In addition, since the intervention of the collision damage mitigation brake to the braking device etc. is carried out only when the collision damage mitigation brake is judged to be the limit because the driver's will is respected for the purpose of mitigating the damage in the event of a collision. Although the deceleration is abrupt, the intervention by the adaptive cruise control on the braking device or the like is generally a gradual deceleration because the purpose is to maintain the inter-vehicle distance.However, when the inter-vehicle distance suddenly decreases, such as when the preceding vehicle suddenly stops, deceleration control is performed so as to avoid the collision as much as possible by cooperative control of the collision damage mitigation brake or overriding (invalidation of instructions).
The command input method when the driver wants to actively intervene is almost the same as the conventional cruise control except for the setting of the inter-vehicle distance.
Since the distance between vehicles (including the case where there is no preceding vehicle) is always known from the information in the front monitoring subsystem, there is no risk of collision with the preceding vehicle even if acceleration is started by the restart command. The driver can give a restart command even at low speeds (stop-several km / h).Therefore, unless the driver actively intervenes or an event that exceeds the vehicle specifications occurs, the setting is generally not deleted even if the speed of the own vehicle falls below the set speed (generally even if it stops). Is the target.
When a restart command is given, the vehicle will return while maintaining the distance from the preceding vehicle, so if the preceding vehicle shifts to constant speed running below the set speed of the own vehicle, that speed will be maintained. (Does not accelerate to the set speed).On the other hand, if the preceding vehicle continues to accelerate above the set speed of the own vehicle, the set speed of the own vehicle will be maintained as the upper limit, which is the same as the state described in "Acceleration during adaptive cruise control".
However, if the forward monitoring subsystem cancels the automatic tracking when the speed is lower than the set speed, the restart command is generally rejected unless the speed is accelerated to the set speed range by the driver's operation.
Unique use of Adaptive Cruise Control
When starting adaptive cruise control in the presence of a preceding vehicle, even if the speed of the preceding vehicle is lower than the driver's desired speed, the driver sets it with the operation switch after the follow-up to the preceding vehicle starts. If the speed is increased to the desired speed, the system recognizes that the vehicle is following the speed limit, so that the speed is maintained while the preceding vehicle is at a constant speed, and when the vehicle starts accelerating, it follows and accelerates. This will be the case (of course, even if the preceding vehicle slows down).That is, it is possible to set the speed desired by the driver regardless of the speed of the preceding vehicle (although there are conditions).
The following problems occur because they are heavily dependent on the information of the forward monitoring subsystem.
- The recognition range of the forward monitoring subsystem and the human recognition range do not always match.Naturally, the performance of the forward monitoring subsystem is also limited.Therefore, the following problems occur when the driver relies on adaptive cruise control for control.
- When a curve, steep slope, preceding vehicle, or own vehicle changes lanes, the forward monitoring subsystem may cancel the automatic tracking even if the preceding vehicle is within the driver's recognition range.If the set speed is higher than the speed at the time when the automatic tracking is canceled, the driver may accelerate unintentionally.For example, when the driver overtakes, the automatic tracking is canceled from the preceding vehicle, so if the speed after the overtaking is completed is less than the set speed, the acceleration will continue, which matches the driver's intention. Not always.In addition, at a point where constant speed or deceleration is appropriate, such as a curve with a large curvature, the automatic tracking may be canceled because it is out of the recognition range of the forward monitoring subsystem. As with cruise control, it tries to match the set speed and may accelerate (for this reason, automakers strongly recommend using it only on motorways).
- While driving at a constant speed without a preceding vehicle, even if a new preceding vehicle enters the driver's recognition range, the forward monitoring subsystem may not always be able to shift from search to automatic tracking.Therefore, even in a state where smooth deceleration can be handled if humans control it, adaptive cruise control may be delayed in control, resulting in sudden deceleration.
- About the inter-vehicle distance control in the automatic tracking state Adaptive cruise control tries to faithfully control, so for example, when a new vehicle comes in from the adjacent lane, it is allowed for human beings to temporarily shorten the inter-vehicle distance. Although control is possible after this, adaptive cruise control slows down in order to secure the distance between the vehicle and the new preceding vehicle.
- When the vehicle speed of the preceding vehicle fluctuates frequently, smooth speed control with some foresight is possible when controlled by humans, but in the case of adaptive cruise control, acceleration / deceleration is required to faithfully follow. It will be.To this the systemHysteresisSince (history effect) is added, the speed control of the own vehicle becomes very rattling depending on the situation.
- In addition, if you overtrust the adaptive cruise control system, an unexpected serious accident may occur due to malfunction or non-operation.
- As mentioned above, automobile manufacturers strongly recommend that they be used only on dedicated roads for automobiles, but when compared to ordinary cruise control, they are easier to use on ordinary roads, but are more responsive to changes in traffic conditions. Since it is inferior to humans and the control of the speed behavior of the own vehicle is inferior, it may require more control than necessary for surrounding traffic conditions, especially for the following vehicles. Also, if there is no preceding vehicle, it is not possible to deal with traffic lights, level crossings, and temporary stops on ordinary roads.
- When the preceding vehicle is automatically tracked, the notification method to the driver when the automatic tracking is canceled and the control method depend on the vehicle type.If the preceding vehicle is not automatically tracked, some types do not intervene in the braking device, so if there is a preceding vehicle (assuming that the preceding vehicle is performing appropriate speed control), it is within the set speed. There are some that exceed the set speed if there is no preceding vehicle on the downhill that can be descended with.
- Conditions such as search, automatic tracking, and cancellation of automatic tracking differ depending on the method and performance of the forward monitoring subsystem.Even if the adaptive cruise control of one vehicle type operates as intended by the driver, it may operate unintentionally in another vehicle type even in the same situation.For example, how it reacts to bicycles and motorcycles, and how it is controlled due to changes in the weather, depends on the vehicle type.
- The problem of speed maintenance when there is no preceding vehicle is similar to conventional cruise control. However, there are also those that cooperate with the car navigation system to implement more appropriate speed control in consideration of the geographical conditions of the road.
- In order to reduce costs, some models have abolished the setting of adaptive cruise control.
Adaptive cruise control of each company
- Cruise control with all vehicle speed tracking function.. * EyeSightSee (eye site).
- Radar cruise control(With all vehicle speed tracking function/with brake control) orDynamic Radar Cruise Control (DRCC).Toyota Safety Sense(Toyota Safety Sense).
- Nissan Motor
- Intelligent cruise control"Intelligent Cruise Control (ICC)".Nissan/Intelligent MobilitySee.
- Honda Motor Co., Ltd.
- Adaptive cruise control.Honda SENSINGSee (Honda Sensing).
- マ ツ ダ
- Mazda Radar Cruise ControlOrMazda Radar Cruise Control (MRCC).. i-ACTIVSENSE.
- Distronic Plus.. The Japanese version comes with a radar safety package, and if it is not installed, it will be equipped with a normal cruise control system.
- Advanced driving support system
- Self-driving car
- Intelligent car
- Lane departure warning system
- Pre-crash system
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