Auxiliary emergency braking system applied to heavy tractor semi-trailer

Abstract

The invention relates to the braking safety aspect of heavy tractor semi-trailers, and discloses an auxiliary emergency braking system applied to a heavy tractor semi-trailer. The auxiliary emergency braking system is connected with a semi-trailer air brake system; when the pedaling speed of stepping on a braking pedal by a driver is higher than a threshold value, the auxiliary emergency braking system is opened, a vacuum sucker is controlled through a pneumatic lifting device to ascend or descend, air in the vacuum sucker is pulled by a vacuum pump to reach the vacuum degree needed by the auxiliary emergency braking system to generate a braking force, so that the semi-trailer is assisted to be emergently braked, and besides, the vacuum degrees of a left device and a right device are controlled to be different in turning braking to realize the stable control of the semi-trailer.

Description

Technical field: [0001] The invention relates to the safety aspect of automobile braking, and more specifically relates to an emergency braking auxiliary system applied to a heavy-duty semi-trailer. Background technique: [0002] Heavy-duty semi-trailers have the advantages of large transportation volume, low cost, high efficiency and economy, and are widely used in cargo transportation. However, due to the characteristics of heavy load, large size and high center of mass, its driving stability and safety are worrying, and traffic accidents are prone to occur, resulting in loss of life and property. With the improvement of society's requirements for automobile safety, the research on the braking performance of heavy-duty semi-trailers has become a hot spot. [0003] With the continuous progress of the automobile industry and the rapid expansion of expressways, the speed of vehicles is getting faster and faster. When braking in an emergency, the braking system of the heavy-...

AI Technical Summary

Problems solved by technology

When braking in an emergency, the braking system of the heavy-duty semi-trailer cannot guarantee to stop within a limited distance, which may easily cause a rear-end collision accident

At the same time, because the axles of the semi-trailer are mainly concentrated in the rear, and the distance from the air supply pipeline controlled by the tractor is relatively long, the braking effect is obviously lagging behind the uncoordinated state of the tractor's braking, so inertial impact force is generated, and folding is easy to occur

At the same time, the semi-trailer is prone to large path deviation and rollover when cornering and braking, which brings great hidden dangers to driving safety.

[0004] At present, domestic and foreign studies on the braking performance of heavy-duty semi-trailers are mostly focused on the distribution of braking force, the optimization of the braking system and control valves, but it is impossible to avoid rear-end collisions, rollovers, and folding under emergency braking conditions, and it is also impossible to control Deceleration to stop in case of brake system circuit failure

Although domestic patents for negative pressure braking devices have been published, the devices provided by this patent are only applicable to passenger cars, using additional mechanical or hydraulic power sources, and have no corresponding control measures for handling stability

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