Electric Power Steering System (EPS) for Bus
Our rack-assist type electric power steering system (R-EPS) for large commercial vehicles like buses is designed with integration, lightweight construction, and energy efficiency in mind, making installation much more efficient. It’s about 15 kg lighter and more compact than traditional EHPS systems. Plus, it only activates during steering, saving 4 kWh of energy per day. Over five years, this adds up to about $3000 in savings on electricity and battery costs.
Whatsapp: +8619352173376
Email: contact@brogenevsolution.com
Working Principle of the EPS for Bus
After the motor outputs torque, it is reduced and amplified through the worm gear system. The worm gear drives the ball screw, which moves the piston rod in a linear motion. The piston rod, connected to the outer tie rod via a ball joint, pushes or pulls the steering arm, turning the wheels.
Unlike traditional hydraulic power steering systems, this EPS for hybrid or battery electric buses provides a smoother ride. This innovative system controls the operation and torque output of the electric power steering motor according to the driving speed of the vehicle and the steering torque and steering angle of the driver’s steering wheel after processing and calculation by the steering electronic control unit (ECU). It’s a device that optimizes the effect of power steering.
Our EPS for Bus VS EHPS for Bus
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Item
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Our EPS for Bus
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EHPS for Bus
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Layout & Installation
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Easy to install with high assembly capacity.
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Requires additional installation space; hydraulic system installation is complex and labor-intensive.
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Parts Management & Cost
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Fewer parts, only EPS and ECU.
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More components, including electro-hydraulic pumps, hydraulic lines, and assist oil; higher procurement, maintenance, and quality costs.
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Size & Weight
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Lightweight, approximately 15 kg lighter than EHPS; compact and space-efficient.
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The hydraulic steering system housing is made of cast iron, resulting in greater weight and environmental pollution during production, particularly in surface coating.
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Efficiency
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>83%
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Approximately 55%
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Steering Feel
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Responsive and precise
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Rigidity
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Direct push-pull type with high rigidity.
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Energy Consumption
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Only operates during steering; saves about 4 kWh per day, leading to savings of about $3000 in electricity and battery costs over 5 years.
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Operates continuously after vehicle startup; energy consumption is 2-5 times higher than EPS.
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Pollution, Recycling, Maintenance
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Maintenance-free, no oil leakage, no environmental pollutions.
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Hydraulic oil usage and disposal increase environmental burden; regular oil changes required.
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ADAS & Autonomous Driving
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Support
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Lack of control precision may lead to difficulties in autonomous systems.
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Features of Our Electric Power Steering System (EPS) for Bus
- Easy installation: adapts to existing layouts for a smooth transition.
- Simplified design: fewer parts for efficient assembly.
- Precise handling: delivers sharp steering and exceptional maneuverability.
- Quiet operation: engineered for low friction and minimal noise.
- Compact & integrated: boasts a compact design for seamless integration.
- Advanced sensors: utilizes non-contact sensors for accurate angle measurement.
- Safety features: equipped with overheating and under-voltage protection.
- Reliable performance: maintains some steering assistance even under certain failure modes.
- Future-proof design: IP67-rated and adapts to the needs of advanced driver assistance systems (ADAS) and autonomous driving, particularly for large steering-by-wire chassis.
Technical Parameters
- Type: Rack-assist type
- Power supply current: 50 A
- Operating voltage: DC 24 V
- Rack stroke & ratio: 274 mm & 50.4 mm/rev
- Maximum pull-push force: 18 kN – 20 kN
- Applicable vehicle information: Front axle load 4500 kg (reference)
How We Work
Requirement Analysis
After signing the NDA, the client provides the maximum axle load for the steering axle, as well as the 3D models and drawings for the steering axle, suspension, part of the chassis, and wheels if necessary.
Steering Torque Calculation and Motion Verification
Based on the data provided by the client, we calculate and verify the relevant parameters for the steering system.
Client Confirmation
The client confirms the mechanical structure and the integration with the complete vehicle assembly.
Electrical and Bus Protocol Integration
We provide the electrical parameters and bus protocol; the client confirms if any modifications are needed.
Signing the Technical Agreement
Both parties sign the technical agreement, and we provide the final quotation.
Contact Us
Get in touch with us by sending us an email, using the Whatsapp number below, or filling in the form below. We usually reply within 2 business days.
Email: contact@brogenevsolution.com
Respond within 1 business day
Whatsapp: +8619352173376
Business hours: 9 am to 6 pm, GMT+8, Mon. to Fri.
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