Módulo 03 - Elementos de seguridad del vehículo - Autos

Understanding Vehicle Safety

Active and Passive Safety

• The concept of vehicle safety is categorized into active, passive, and preventive safety measures.

• Active safety aims to prevent accidents by ensuring stable braking, good recovery, and predictable behavior in various situations.

Suspension System

• The suspension system plays a crucial role in active safety by providing comfort, reducing terrain irregularities' transmission to the cabin, and enhancing vehicle stability.

• Shock absorbers are vital for maintaining stability; poor condition leads to increased stopping distances and instability during driving.

Effects of Worn Shock Absorbers

• Deteriorated shock absorbers can cause reduced occupant comfort due to jolts while driving and worsen steering control during turns.

• Detecting shock absorber wear is challenging as drivers may gradually adapt to performance deficiencies. Initial checks should focus on oil leaks.

Testing Shock Absorber Condition

• Signs of rear shock absorber failure include the car veering off course; front shocks affect turning ability.

• A method for testing involves turning the steering wheel fully left/right while moving slowly and observing the hood's movement after sudden stops.

Brake System Overview

Brake Mechanisms

• Brakes reduce vehicle speed through friction between pads and either drum or disc systems. They can be mechanical, pneumatic, hydraulic, or electric.

• Common configurations include disc brakes at the front wheels and drum brakes at the rear for better performance balance.

Maintenance Tips for Brakes

• Regularly check brake fluid levels within specified limits; perform complete brake system inspections annually or every 20,000 km.

• Brake pads typically last 40,000 to 50,000 km but should not exceed 90,000 km due to crystallization that reduces effectiveness.

ABS (Anti-lock Braking System)

• ABS enhances braking efficiency by preventing wheel lock-up during emergency stops or slippery conditions. It allows better vehicle control even when braking hard.

Steering System Insights

Steering Functionality

• The steering system directs wheels based on driver input with precision; it significantly impacts overall vehicle stability.

Power Steering Systems

• Hydraulic power steering reduces effort needed on the wheel while ensuring optimal control under extreme conditions.

Maintenance Recommendations for Steering

Vehicle Steering and Tire Maintenance

Importance of Steering System Inspection

• Regularly check the steering pinion in hydraulic systems for assisted steering, ensuring pump pressure is correct and no leaks are present.

• Inspect both mechanical and assisted steering components while the vehicle is running; misalignment or excessive tire wear can severely affect steering performance.

• If steering becomes stiff or makes unusual noises, seek a complete inspection at a workshop to prevent further damage.

Tire Safety and Performance

• Tires are crucial for active safety in vehicles, directly influencing handling and stability; their condition must be monitored closely.

• Key factors include tire pressure and tread depth; maintaining these ensures optimal performance under various conditions.

Tread Depth Guidelines

• Minimum tread depth should be 1.6 mm; however, it’s advisable not to go below 2 mm to avoid reduced grip and potential aquaplaning on wet surfaces.

• A simple home test involves placing a coin in the tire's drainage channel; if the gold circle is visible, it's time for replacement.

Visual Inspections of Tires

• Conduct visual checks for sidewall cuts or bulges that indicate internal layer damage which could compromise safety.

• Ensure proper inflation as low pressure can lead to poor handling; front tires with inadequate pressure may cause drifting during braking.

Identifying Tire Wear Patterns

• Uneven wear patterns can signal incorrect alignment or overloading issues; inspect tires regularly based on manufacturer recommendations.

• Rapid abnormal wear on one side often indicates misalignment between rear tires, necessitating alignment correction.

Passive Safety Features in Vehicles

Role of Passive Safety Systems

• Passive safety features aim to minimize injury during unavoidable accidents through mechanisms like seat belts and collapsible structures.

Seat Belt Regulations

• In Argentina, wearing seat belts is mandatory as they significantly reduce injury risk by preventing occupants from being thrown forward during collisions.

Types of Seat Belts Required

• Front seat belts must be three-point harnesses combining abdominal and diagonal straps with quick-release buckles; rear seats should ideally have similar restraints.

Airbag Functionality Considerations

Importance of Seatbelts and Safety Features in Vehicles

The Role of Seatbelts in Reducing Injuries

• Retaining occupants in their seats during a collision minimizes the impact consequences, leading to significantly reduced injuries compared to unrestrained individuals who may collide with the vehicle's interior.

• In a crash, while the vehicle stops abruptly, passengers continue moving at the same speed until they hit the dashboard or each other, increasing injury risk.

• Statistics show that seatbelt use can reduce brain injuries by 33% for drivers and 56% for passengers; skull fractures are reduced by 18%, and facial injuries by up to 64%.

Proper Use of Seatbelts

• Recommendations include adjusting seats upright for comfort and ensuring that both adults and children learn proper seatbelt usage.

• The seatbelt should be positioned between the neck base and shoulder, snug but not tight; it must engage properly on the side device of the seat.

• Incorrect practices such as loose belts or placing them under an arm can lead to severe injuries during accidents.

Headrest Functionality

• Headrests were introduced as comfort features but have proven essential in preventing cervical injuries during collisions; regulations began enforcing their use in Argentina in the '90s.

• The "whiplash effect" occurs when a rear-end collision causes violent head movement relative to the torso, risking serious neck injuries.

Correct Positioning of Headrests

• Properly adjusted headrests help mitigate whiplash risks by keeping the head aligned with the spine during impacts.

• The top edge of a headrest should align between eye level and the top of one's head; it must also be close enough (within 5 cm) to prevent extreme flexion during crashes.

Types of Headrests

• There are two types: removable (which require height adjustment for safety) and fixed (integrated into seats without need for adjustment).

Advanced Safety Features: Steering Column Design

• Collapsible steering columns consist of telescopic tubes designed to absorb impact forces from frontal collisions, protecting drivers from potential injury caused by steering wheel movement.

Airbags as Essential Safety Devices

Airbag Functionality and Vehicle Safety Features

Airbag Activation Mechanism

• The airbag is a passive safety device that activates only during an impact, specifically when colliding at speeds of 18 km/h with an unyielding object or 45 km/h with a deformable obstacle.

• Upon detecting a collision, an electric impulse triggers gas generator tablets, igniting solid fuel which undergoes a chemical reaction resulting in rapid gas expansion to inflate the airbag within 0.2 seconds.

Post-Inflation Dynamics

• After inflation, gas escapes through small openings in the airbag to allow occupant mobility while maintaining protection.

• The steering wheel is designed for energy absorption, featuring no rigid zones and a deformable structure to enhance safety during collisions.

Interior Safety Considerations

• Interior components must be designed to prevent injury from impacts; this includes protective coverings and strategic placement of elements like dashboards and seats.

• Seats are constructed from steel pieces welded together, ensuring they can withstand passenger loads and forces during collisions while housing mechanisms for airbags and seatbelts.

Fuel Tank Design

• The fuel tank is engineered to absorb energy through programmed deformation upon impact, distributing forces evenly to protect the cabin area.

Glass and Windshield Safety Features

• Windshields are made from materials that minimize shattering risks during accidents; side windows are weaker but serve as exits in rollovers.

• Both windshields and rear windows are bonded with strong adhesives to enhance structural integrity and prevent ejection of unrestrained occupants during crashes.

Child Passenger Safety Guidelines

Proper Child Seating Arrangements

• Infants should always travel in the back seat for optimal protection; their age and size must be considered when determining seating arrangements.

Vehicle Safety and Maintenance Guidelines

Child Safety in Vehicles

• It is recommended that children travel in the back seat of the vehicle, using a safety seat if possible. If a safety seat lacks a seatbelt, it does not provide protection; thus, the child should use the vehicle's seatbelt.

• For shorter children whose seatbelts do not fit properly, a cushion may be used until they reach around 12 years old.

Vehicle Comfort and Ergonomics

• The design of vehicles should enhance visibility and comfort through features like large windows, mirrors, and effective wipers to improve road control even in adverse weather conditions.

• Interior ergonomics are crucial; controls should be easy to operate and read while ensuring noise insulation for better concentration during driving.

Climate Control Importance

• Proper climate control within vehicles significantly contributes to passenger comfort. A good system maintains ideal temperature and humidity levels year-round.

Regular Vehicle Maintenance

• Regular inspections help detect potential failures or damages that could lead to accidents. Owners can perform many maintenance tasks themselves without incurring costs.

• Weekly checks on radiator water levels are essential; avoid removing pressure caps when hot. Monthly oil level checks are also necessary.

Detailed Maintenance Procedures

• Monthly brake fluid inspections should ensure proper levels without exceeding marked lines. Additionally, check for leaks in the braking system regularly.

• Inspect rubber hoses monthly for wear or damage; replace any worn belts as needed. Ensure air filters are checked every two months for cleanliness.

Technical Inspections and Regulations

• Mandatory technical inspections (RT) must be conducted by certified workshops under qualified engineers who assess vehicle safety risks due to malfunctions or part wear.

• These inspections must occur at the same establishment each time, with records kept of all evaluations performed on the vehicle's condition.

Technical Review Regulations for Vehicles

Overview of Vehicle Inspection Timelines

• After seven years from the initial patenting, the validity period of the technical review (RTE) will be 12 months. This applies similarly to vehicles that are not for personal use, which must undergo mandatory technical reviews within a maximum of 12 months from their initial patenting.

Requirements for Natural Gas Vehicles

• For vehicles powered by natural gas, compliance with legal requirements must be demonstrated through the presentation of the corresponding sticker. This ensures adherence to national regulations regarding gas.

Classification of Technical Review Results

• The authority responsible for issuing results after a technical review categorizes them into three grades:

• Apto: Indicates no deficiencies affecting safety on public roads.

• Condicional: Signifies deficiencies requiring a follow-up inspection; private vehicles have up to 60 days, while non-private vehicles have up to 30 days to comply.

Consequences of Rejection and Follow-Up Inspections