RU204399U1 - Active bonnet for pedestrian protection - Google Patents

Abstract

The utility model relates to devices for external passive safety of passenger cars, namely, to the structure of body elements, in particular the bonnet. Essence: an active car bonnet for pedestrian protection contains a bonnet cover, brackets for attaching the rear part of the bonnet to the vehicle frame, and an emergency hood lid lifting device. The latter includes bonnet lifters, acceleration and contact sensors mounted on the front bumper and an electronic control unit. The hood is equipped with a lever system for limiting the hood lifting height, and the lifters are made in the form of pneumatic cylinders, the rods of which are equipped with clamps with electromagnets. Moreover, the fingers of the brackets for attaching the rear part of the hood are equipped with electromagnets and are made retractable. The technical result is the multiple actuation of the active hood of the car to protect pedestrians while ensuring the controllability of the damping force of the hood. In addition, the claimed utility model allows easy access to the engine compartment. The above allows to increase the external passive safety of the vehicle. 2 ill.

Description

The utility model relates to devices for external passive safety of passenger cars, namely, to the structure of body elements, in particular the bonnet.

Measures to improve external passive safety are aimed at reducing the severity of injury to pedestrians, drivers and passengers of a vehicle involved in an accident, by ensuring such a constructive implementation of the outer surfaces and elements of the vehicle, in which the likelihood of human injury by these elements would be minimal (see Molodtsov V. A. Safety of vehicles. Textbook for universities. - Tambov: TSTU. - 2013. - P. 181).

Known active hood for the protection of pedestrians, containing a sensor on the front bumper and a pyrotechnic mechanism for raising the hood. The active bonnet system automatically raises the bonnet in the event of a collision with a pedestrian. The controlled hood rises 65 mm in 40 milliseconds and, despite the impact, remains in the raised position. As a result, the pedestrian, when hitting the bumper, will not hit hard and blunt parts located under the hood. In the event of a collision, the bonnet acts as a shock absorber. The risk of injury is reduced as the pedestrian's head and shoulders do not bump into the engine. Cars equipped with the Active Pedestrian Hood, Volkswagen Tiguan, Jaguar F-type Roadster SVR, Mercedes-Benz S-class Hybrid and some other high-end passenger cars (see Active Pedestrian Hood http: // www. autoneva.ru/glossary/aktivnyy_kapot_dlya_zaschityjeshehodov.html)

The disadvantage of this design is the difficulty in closing the hood after triggering, which requires special equipment available only in a specialized service center, as well as a one-time triggering of the device.

Known safe car containing a hood, made with the possibility of movement by means of an actuator made in the form of a pypatron placed in a pneumatic cylinder, to a safe position at the command of the sensor when a pedestrian collides or the threat of such a collision, and the rear edge of the hood is made with the ability to rise to the front edge of the roof of the car, while the hood has an element that provides the driver with a partial view of the road in front of the vehicle when the hood is in a safe position. The hood opens by a signal from the collision sensor, a signal is sent to the hood lock opening drive and the detonation of the squib located in the pneumatic cylinder, which extends its rod and raises the rear edge of the hood (see RF Pat. No. 2223185, B60R 21/34, B60J 1/02).

The disadvantage of this design is the one-time operation of the device, after which it is necessary to contact the service center to replace the squib, while at the same time the complexity of the hood design.

Known design of the front end of the vehicle, providing pedestrian protection and containing an energy-absorbing structural element in the form of a hood, an executive system including a drive locking device installed on the engine support structure with the possibility of sliding movement between the extended position to transfer the energy-absorbing structural element to the active position and retracted position to transfer the energy-absorbing structural element to an inactive position. The transfer of the energy-absorbing structural element to the active position is driven by a squib (see RF Pat. No. 2651783, B60R 21/38).

The disadvantage of this design is the one-time operation of the device, after which it is necessary to contact the service center to replace the squib. In addition, the installation of the energy absorbing structural element on the engine support structure results in vibration from the running engine, which is transmitted to the hood, which causes noise and premature failure of the bonnet attachment elements.

The closest analogue in technical essence to the claimed utility model is a pedestrian protection system installed on a car and including a car bonnet cover, brackets for attaching the rear part of the bonnet to the car frame and an emergency bonnet lid lifting device containing bonnet lifters, acceleration sensors and a contact sensor installed on the front bumper, and the electronic control unit. The lifts have a pyrotechnic or spring-pyrotechnic drive (see Pedestrian protection system http://svstemsauto.ru/passive/pedestrian_protection_system.html).

The disadvantage of this design is the one-time operation of the device, after which it is necessary to contact the service center to replace the squib, while at the same time it is impossible to adjust the damping force of the hood. In addition, the device may be triggered if the bumper accidentally rests on an obstacle, after which it will be necessary to contact the service center, which will have to move with the hood raised.

The technical problem of the known solutions lies in the single actuation of the device, after which it is necessary to contact the service center to replace the squib, while the access to the engine compartment is difficult due to the installation of the bonnet hinges in the front of the car.

The essence of the claimed utility model lies in the fact that the active bonnet of a car for the protection of pedestrians contains a bonnet cover, brackets for attaching the rear part of the bonnet to the vehicle frame, and a device for emergency lifting of the bonnet cover. The latter includes bonnet lifters, acceleration and contact sensors mounted on the front bumper and an electronic control unit. The hood is equipped with a lever system for limiting the hood lifting height, and the lifters are made in the form of pneumatic cylinders, the rods of which are equipped with clamps with electromagnets. Moreover, the fingers of the brackets for attaching the rear part of the hood are equipped with electromagnets and are retractable.

The technical result achieved by the claimed utility model consists in the multiple actuation of the active hood of the car to protect pedestrians while ensuring the controllability of the damping force of the hood. In addition, the claimed utility model allows easy access to the engine compartment. The above allows to increase the external passive safety of the vehicle.

The utility model is illustrated by drawings, where:

in fig. 1 schematically shows a general view of the active hood from the side;

in fig. 2 is a general view of the active hood from above.

The active hood of a car for the protection of pedestrians contains a hood cover 1 installed on the car frame 2, brackets 3 for attaching the rear part of the hood, a lever system 4 for limiting the hood lifting height, a loop 5 fixed in the front part of the hood, a latch 6 installed on the front part of the frame 2 The drive of the device for emergency lifting of the bonnet 1 includes two pneumatic cylinders 7 installed in the free engine compartment on the frame 2 of the car, clamps 8 of the piston rods 7, controlled by electromagnets 9, pins 10 for fastening the levers 4 to the frame 2 of the car, controlled by electromagnets 11. Control signal the electromagnets 9 and 11 are supplied from the acceleration sensors 12 and the contact sensor 13 installed on the front bumper, and the electronic control unit (not shown in the figure).

The claimed active hood of a car for the protection of pedestrians works as follows.

The bonnet is normally opened by releasing the hinge 5 fixed in the front of the bonnet from the latch 6 mounted on the front of the frame 2. The rising bonnet pivots on levers 4 around the pins 10, giving access to the engine compartment from the front. When a moving car hits a pedestrian, sensors 12 and 13 installed on the front bumper of the car are triggered. The signal from sensors 12 and 13 is transmitted to electromagnets 9 and 11 for controlling latches 8 and fingers 10, releasing the rods of the pneumatic cylinders 7 and brackets 3. Under the action of compressed air in the cavities of the pneumatic cylinders 7, their pistons move abruptly upward, pushing the bonnet cover 1 upward through the rods and heads ... The bonnet cover 1, rising, turns on the hinge 5 around the latch 6, and the lift of the rear part of the bonnet is limited by the lever system 4. A falling pedestrian will be stopped by the raised bonnet cover and protected from hitting the front pillars 14 of the windshield frame. To bring the pneumatic cylinder 7 to its original position after triggering, the rear part of the hood is lowered manually by pressing on it from above, the rod of the pneumatic cylinder 7 is also lowered down until the latch 8 hits the recess. Through the nipple, air is pumped by a car compressor into the cavity of the pneumatic cylinders 7 to a predetermined pressure (about 5-7 atmospheres). With the diameter of the piston of the pneumatic cylinder 7 of the order of 100 mm and the pressure in the cavity of the order of 7 atm (7 kgf / cm2), the force on the rod of one cylinder will be 560 kgf, which will ensure the lifting of the hood weighing 10-15 kg to a height of 10-12 cm in 0.005 sec, which approximately half the time between pedestrian strikes against the bumper and the bonnet. At the moment of contact of the pedestrian with the hood, the latter will already begin to move downward, since air will escape from the housing of the pneumatic cylinder 7, which will reduce the force of the pedestrian's impact on the hood.

Thus, the claimed utility model makes it possible to provide multiple actuation of the active hood of a car to protect pedestrians while ensuring the controllability of the damping force of the hood. In addition, easy access to the engine compartment is provided. The above allows to increase the external passive safety of the vehicle.

Claims (1)

An active car bonnet for pedestrian protection, comprising a bonnet cover, brackets for attaching the rear part of the bonnet to the vehicle frame and an emergency bonnet lift device, including bonnet lifters, acceleration sensors and a contact sensor installed on the front bumper, and an electronic control unit, characterized in that the bonnet is equipped with a lever system for limiting the bonnet lifting height, bonnet lifters are made in the form of pneumatic cylinders, the rods of which are equipped with clamps with electromagnets, and the pins of the brackets for fastening the rear part of the bonnet are equipped with electromagnets and are retractable.

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