Vehicle braking system

FIELD: automotive industry.

SUBSTANCE: invention relates to automotive industry and can be used as an automatic braking system. Proposed braking system comprises monochromatic oscillation generator, power amplifier, directional radiator, radiation receiver, narrow-band amplifier, two shapers of rectangular pulses, two integrators, comparator, current amplifier and electromagnetic drives. Power amplifier is connected with generator, radiator and pulse shaper connected to integrator, the output of the latter being connected to comparator input. Narrow-band amplifier is connected with receiver and 2nd shaper of rectangular pulses, connected to 2nd integrator. Output of the latter is connected to the 2nd input of comparator. Comparator output is connected to current amplifier, the output of which is connected to electromagnetic drive linked up with the brake drive.

EFFECT: increased speed of brake system operation.

5 dwg

 

The invention relates to the field of organization of road safety and can be used as automatic braking of the vehicle when approaching an obstacle.

Known braking system of the vehicle containing the brake device and the drive of the brake device [Electric equipment hire: textbook for universities. / Swichkow, Upickem. - M.: JSC KZI "driving", 2004. - 384 p].

The disadvantage of this system is that the start of braking is determined by the driver of the vehicle visually to reduce the distance between the vehicle and the obstacle. Subjective factor reduces traffic safety.

Closest to the proposed invention is a braking system of the vehicle containing the brake device of the vehicle brake emitters certain frequency radiation, the device drive brake [Electrical equipment military vehicles: a textbook. / Baganov, Vdergachev, NPICenter. - Ryazan; Military. car kit. Institute, 2005. - 598].

The system is based on the fact that during braking of the vehicle occurs, the radiation back fluctuations of a certain wavelength, which visually is registered by the driver behind going vehicle, privatising the action of the brake system.

A disadvantage of the known braking systems is that the system is driven by a driver after a visual check of the brake lights of the vehicle ahead or other obstacles. The length of time from the appearance of the radiation prior to the actuation of the brake devices depends on the reaction and the physical condition of the driver and is tenths of a second. This is a great way of braking. Another disadvantage is the appearance on the route of vehicle barriers, not emitting a warning signal. In this situation, the total time of braking to a complete stop increasing because of the time required for the recognition of obstacles and making decisions about the need for braking.

The technical result is to eliminate the subjective factor (the reaction of the driver) of the procedures emergency braking, increase the speed of actuation of the brake system by electron-electromagnetic-mechanical system and autonomization (regardless of the driver steps the brake system, regardless of the nature of the obstacles and the presence of emitters from obstacles.

The technical result is achieved by the fact that the braking system of the vehicle as a traffic participant, containing brake TPA the transport means, brake emitters certain frequency radiation, power brakes, equipped with an additional generator monochromatic oscillations, power amplifier, directional emitter, a radiation receiver, a narrow-band amplifier, two shapers rectangular pulses, two integrators, a comparator, a current amplifier, an electromagnetic actuator, while the power amplifier is connected to the generator, the emitter and the pulse shaper connected to the integrator, the output of which is connected to the input of the comparator, while the narrow-band amplifier connected to the receiver and to the second shaper rectangular pulses, which is connected with the second integrator, the output of which is connected with the second comparator input, the comparator output is connected to the input of the current amplifier and current amplifier output is connected to an electromagnetic actuator mechanically connected to the device power brakes.

The hallmark of the invention is that the braking system is further provided with a generator of monochromatic oscillations, power amplifier, directional emitter, a radiation receiver, a narrow-band amplifier, two shapers rectangular pulses, two integrators, a comparator, a current amplifier, an electromagnetic actuator, when et is m the power amplifier is connected to the generator, emitter and pulse shaper connected to the integrator, the output of which is connected to the input of the comparator, while the narrow-band amplifier connected to the receiver and to the second shaper rectangular pulses, which is connected with the second integrator, the output of which is connected with the second comparator input, the comparator output is connected to the input of the current amplifier and current amplifier output is connected to an electromagnetic actuator mechanically connected to the device power brakes.

Figure 1 shows the functional diagram of the proposed system automatic emergency braking.

Figure 2 presents the dependence of the voltage from the time UWHand UWHat the inputs of the integrators (a, b), the outputs of the integrators UOUT1UOUT2(in) and the output of the comparator (UOUT1-UOUT2) (g).

Functional diagram (figure 1) contains the vehicle 1, obstacle 2, the generator monochromatic oscillations 3, the power amplifier 7, a directional emitter 4, the radiation receiver 5, the narrow-band amplifier 6, the two shaper rectangular pulses 8 and 9, two of the integrator 10 and 11, a comparator 12, a current amplifier 13, the electromagnetic actuator 14, the brake 15, the braking device 16, and the amplifier 7 is connected to a generator 3, a radiator 4 and the pulse shaper is law 9, connected to the integrator 11, the input of which is connected to the input of the comparator 12, the narrow-band amplifier 6 is connected to the receiver 5 and the second shaper rectangular pulses 8, which is connected with the second integrator 10, the output of which is connected with the second input of the comparator 12, the output of the comparator is connected to the input of the current amplifier 13, and the output of the current amplifier 13 is connected to the electromagnetic actuator 14 which is mechanically connected to the brake device 15 connected to the brake devices 16. Obstacle 2, located on the route of the vehicle, generates a reflected signal 17 of continuously radiated signal 18.

The principle of the device is built on the change in frequency of the reflected signal from the object 2 with respect to the receiver 5.

The device operates as follows. Generator 3 generates monochromatic oscillations, which are amplified by the amplifier 7. Radiated oscillations 18 can be ultrasonic or electromagnetic. The amplified signal is supplied to the emitter 4, which emits monochromatic oscillations in continuous mode in the direction of movement of the vehicle 1. When there is an obstacle 2 ahead in the path of the emitted signal 18 is reflected back and the reflected signal 17 is registered by the receiver 5 moving transport the nogo tool. When you change the distance to the obstacle according to the Doppler effect the frequency of the reflected signal changes: reducing the distance frequency increases and as the distance to the obstacle signal frequency decreases. If you convert the frequency difference between the receiving and radiating paths in permanent electrical signals, the difference of these signals can be judged on the reduction of the distance to obstacles, approaching obstacles and the presence of pre-emergency situation. The magnitude of the difference signal proportional to the speed of convergence. With decreasing distance to the obstacle on the output of the comparator 12 is a differential signal which after amplification by the amplifier 13 controls the electromagnetic actuator 14 of the brake amplifier 15 connected to the brake devices 16.

When there is an obstacle 2 reflected from the obstacle signal 17 is registered by the receiver 5, is amplified narrowband amplifier 6 and to the input of the pulse shaper 8. The pulse shaper 8 generates rectangular pulses of the same duration tin(figa) and a given amplitude Uinone (positive) polarity. The pulse duration of tinnot more than half the period of oscillation of the emitted signal tin<T1. The pulses are formed using, for example, waiting for a mul is vibrator. The generated pulse signal UWHis input to the integrator 10. Then use the integrator 10 pulse signal is converted into a signal with a constant voltage value

UOUT1(figb, 2B), proportional to the frequency of the pulses fed to the input of the comparator 12.

The signal from the amplifier 6 is fed to the input of another pulse shaper 9, which generates rectangular pulses of the same duration

tin=tinand amplitude Uin=Uinas in the first shaper (Fig). A pulse signal UWHapplied to the input of the integrator 11 is converted by using the integrator 11 in the DC signal UOUT2(figb, 2B). The signals from the outputs of the integrators 10 and 11, respectively, UOUT1and UOUT2go to corresponding inputs of a comparator 12. At the input of the comparator 12, which signal UOUT2with tract emitter, set the electronic key, which in the absence of a signal from the receiver is closed, and when the presence of a signal from the receiver is open. This is done, for example, by using a transistor controlled by a signal from the receiving channel. Therefore, in the absence of signal at the receiver at the output of the comparator 12 is no signal and the electromagnetic actuator 14 is not valid.

When in the receiver 5 of the reflected signal 17 from prepad is via 2 it is amplified narrowband amplifier 6. Of the amplified sinusoidal signal is generated as a pulse signal that is integrated by the integrator 10, and the result is a continuous signal which is proportional to the oscillation frequency. In the presence of the received signal input of the comparator 12 through the line emitter opens and it's receiving a signal which is proportional to the frequency of the emitter UOUT2~f(1/T2).

In case of equality of the frequencies of the signals at the emitter v2and receiver v1the periods of the pulse is equal to T2=T1and the signal at the output of the comparator 12 is absent, as the algebraic sum of the signals at the inputs equal to zero UOUT1-UOUT2=0. When there is an obstacle 2 signals at the inputs of the comparator 12 is equal at a constant distance from the emitter to the obstacle reflecting the emitted signal. If the distance between the obstacle 2 and the moving vehicle 1 vehicle is reduced, the frequency of the received signal increases ν12and the repetition period of the pulses decreases T2>T1At a constant pulse duration and greater frequency ν1the magnitude of the signal at the output of the integrator 8 channel receiver 5 increases UOUT1-UOUT2>0. At the output of the comparator 12 is a differential signal of positive polarity (high). This signal gain is provided by the current amplifier 13, which controls the action of the electromagnetic actuator 14 that operate the brake booster 15 and, respectively, the brake device 16. With increasing distance between the vehicle 1 and the obstacle 2, the frequency of the received signal v1decreases and compare unit the comparator 12 generates a signal of negative polarity. The working point of the output amplifier cascade comparator 12 is selected so that it was opened only when the signal of positive polarity.

Comparative analysis of the prototype has shown that the present invention excludes from procedures emergency braking subjective factor (the reaction of the driver), increases the speed of operation of the brake system using electron-electromagnetic-mechanical system and autonomicity action of the brake system, regardless of the nature of the obstacles and signal emitters obstacles. The proposed braking system of the vehicle more effectively in comparison with the similar because you use the automatic braking system. If it increases the safety of the vehicle and, consequently, the safety of all road users in different environments.

The braking system of the vehicle as a participant of road magic cube MOV is I, containing the brake device of the vehicle brake emitters certain frequency radiation, the device drive brake, characterized in that it further comprises a generator of monochromatic oscillations, a power amplifier, a directional emitter, a radiation receiver, a narrow-band amplifier, two shaper rectangular pulses, two integrator, a comparator, a current amplifier, electromagnetic actuators, while the power amplifier is connected to the generator, the emitter and the pulse shaper connected to the integrator, the output of which is connected to the input of the comparator, while the narrow-band amplifier connected to the receiver and to the second shaper rectangular pulses, which is connected with the second integrator, the output of which connected with the second comparator input, the comparator output is connected to the input of the current amplifier and current amplifier output is connected to an electromagnetic actuator mechanically connected to the device power brakes.



 

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