The system of preventing the unintentional acceleration is part of the active safety system of the car that corrects driver errors in parking and manoeuvring in limited space. Development of active vehicle safety systems
Development of active vehicle safety systems
The main components of the vehicle's active safety system have been developed over the past two decades. In the future, when their use is well established in world practice, developers have gradually come to generalize them into a single global system of active security in which certain elements, such as the exchange rate stability system or anti-lock system, could work in close cooperation with each other.
With the introduction of the concept of active second-generation security, there was a need to establish various subsystems to assist the driver in private car management.
Examples include a number of technologies that are being promoted by major automakers such as Toyota, General Motors, Volkswagen, Nissan and others. These are the systems of detection of pedestrians, emergency steering, rescue assistance and many others. They were developed by Toyota's two systems of prevention of unintended acceleration-Intelligent Clearance Sonar and Drive-Start Control. These systems work in pairs, complementing each other.
Intelligent Clearance Sonar
The Intelligent Clearance Sonar system includes control of space in front of and behind the car, that is, in places where the car may unexpectedly appear if the driver makes a mistake and by turning on the wrong gear, presses the accelerator pedal.
The system is based on signals from ultrasound sensors. The computer control unit interprets their signals and determines whether there are obstacles ahead or in the back. It has also been programmed to respond to emergency situations, which are associated with a sudden sharp brake pedal, which may be evidence that the driver has mistaken the pedal.
As part of the integration into the active security system, the Intelligent Clearance Sonar subsystem interacts with the exchange stability system or the tracking tracking system. In the case of the computer's unintended acceleration, the exchange rate stability system is blocking the opening of the electronic throttle and the acceleration is not happening. If the vehicle is already moving at a significant speed, engine braking first occurs, and then, if the speed is reduced, the vehicle continues to converge with the obstacle, the service braking system is activated until it is fully stopped. Activation of the brake system shall be done by means of a pump within the brake force distribution system with which the Intelligent Clearance Sonar communicates.
Drive-Start Control
This subsystem monitors the location of the automatic transmission selector in the same way as the Intelligent Clearance Sonar tracks the unintended pressing of the gas pedal. In the event that the driver transfers the lever from the R to D mode, the system considers the situation to be unnormal and prevents the vehicle from being dispersed in an undesirable direction.
The Intelligent Clearance Sonar monitors the position of the selector position and the speed sensor. In the case of unintentional switching of a selector from one position to another, the system, like the Intelligent Clearance Sonar, through the exchange stability system or the trading control system prevents the opening of the throttle and thus the increase in speed.
Descent Assistance System
The type of anti-spam acceleration system can be considered a system of assistance in launching a number of manufacturers. It can be called in a different way, but it serves the same purpose.
Volkswagen and BMW are promoting it under the name Hill Descent Control (HDC). The similar system of Toyota is called Downhill Assist Control (DAC), and Nissan sells it under the brand Downhill Drive Support (DDS).
Like the subsystems described above, Hill Descent Control uses the capabilities of the exchange rate stability system.
The descent aid system does not allow for rapid acceleration of the movement from the mountain using the vehicle's service braking system and the hydraulic pump for the individual wheels.
Unlike the Intelligent Clearance Sonar and the Drive-Start Control, the help system is activated by pressing the button on the dashboard. There are certain conditions under which it is activated. In general, the gradient shall be significant and the speed shall not exceed 20 km/h.
The algorithm of running the system is similar to that of the systems described above. The computer monitors the speed of the vehicle by the sensors, and considering the position of the selector (that is, the restriction on the activation of the higher gear), detecting acceleration, activates a hydraulic pump that creates pressure in the brake system and does not allow the car to be dispersed by maintaining constant speed.
