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Overview

Electric buses still depend on compressed air for critical vehicle functions, but electrification changes how that air must be generated. Compressor systems need to combine energy efficiency, compact installation, low noise and flexible control while meeting the different pneumatic demands of braking, suspension and door systems.A leading European manufacturer of electric buses and trolleybuses worked with Ingersoll Rand Transport Solutions (IRTS) to integrate TX Series electric compressors into its vehicle platforms. The solution uses air- and water-cooled TX02 configurations to support different vehicle layouts and operating requirements. The resulting compressor platform provides the manufacturer with lower energy consumption, compact installation, reliable performance and diagnostics while supporting standardization across multiple vehicle types.

Challenge: Pneumatic Systems for Electric Buses

The manufacturer produces electric and low-emission buses and trolleybuses, with thousands of vehicles delivered across Europe and expansion into North America. Its vehicles rely on compressed air for several important functions, including braking, suspension, automatic door operation and driver seat adjustment. The manufacturer needed a direct OEM partnership that could improve product integration, reduce lead times and provide greater control over system performance. The technical requirements were particularly complex because the compressors needed to:
  • Support multiple pneumatic subsystems with different duty cycles and pressure requirements.
  • Adapt to different vehicle models, including articulated and low-floor buses.
  • Fit within varying spatial and thermal constraints.
  • Offer air- and water-cooled configurations.
  • Support integration into the vehicle's electronic control architecture.
  • Enable key components to be standardized while retaining flexibility for individual vehicle configurations. 
The challenge was therefore not simply supplying compressed air. The compressor system needed to become an integrated part of the electric vehicle platform.

Solution: TX02 Electric Compressor Systems

The solution is based on TX Series airends, with multiple configurations available to meet different vehicle requirements. All TX Series compressors described in the case study use oil-lubricated rotary vane technology. 
  • Air-Cooled TX02 with Induction Motor: The air-cooled TX02 is available with a motor-only configuration for straightforward, single-speed applications with more stable load conditions.An alternative configuration incorporates an air-cooled inverter, providing greater flexibility, smoother start-stop functionality and extended component life. 
  • Water-Cooled TX02 with Permanent Magnet Motor: The water-cooled TX02 uses a high-efficiency permanent magnet synchronous motor (PMSM) with a built-in inverter and improved control strategies.The system is compliant with J1939 and supports UDS and DM1 diagnostics. Its water-cooled design enables higher power density and quieter operation, making the configuration particularly suited to applications such as low-floor buses and urban routes, where installation space, noise and heat dissipation are important considerations. Across the platform, the vehicle pneumatic system operates between 8 and 12 bar, with airflow adapted to specific vehicle requirements. The compressors can also be integrated into the vehicle's CAN-based control architecture, supporting real-time diagnostics, predictive maintenance and adaptive performance tuning.

SYSTEM PRESSURE

8–12

bar

Pneumatic operation

Operating pressure range for the vehicle pneumatic system.

COOLING OPTIONS

2

configurations

Air + water cooled

TX02 configurations accommodate different vehicle architectures.

PNEUMATIC FUNCTIONS

4

Vehicle applications

Braking, suspension, automatic doors and driver seat adjustment are identified.

Applications of Electric Bus Compressors

The TX02 compressor systems support several pneumatic functions within the customer's electric public transport vehicles.
  • Braking: Stable and responsive air pressure supports the vehicle braking system under varying load and road conditions. 
  • Air Suspension: Compressed air enables suspension systems to adjust vehicle ride height and respond to road irregularities, supporting vehicle handling and passenger comfort.
  • Automatic Doors: Automatic bus doors rely on consistent pneumatic actuation to operate reliably across repeated opening and closing cycles. 
  • Driver Seat Adjustment: In selected vehicle configurations, the compressor system also supplies pneumatic air for driver seat adjustment. 

Impact and Results

The implementation of the TX02 compressor series delivered operational and strategic benefits for the electric bus manufacturer. 
  • Improved Energy Management: Inverter-equipped and water-cooled TX02 variants provide improved energy management. According to the case study, the units reduced overall power consumption, contributing to lower operating costs and extended vehicle range.
  • Modular Integration Across Vehicle Platforms: The modular TX02 platform enables the manufacturer to use the same core compressor technology across multiple vehicle types while adapting the cooling system, controls and mounting configuration for individual applications. This provides an important balance between component standardization and vehicle-specific customization.
  • Improved OEM Integration: The direct OEM relationship helped streamline procurement and integration, reducing lead times and improving system compatibility. 
  • Diagnostics and Serviceability: Integration with the vehicle's CAN-based architecture enables diagnostic and performance-management capabilities. The case study also reports that compressor durability and serviceability have extended product life cycles. 
Ingersoll Rand Transport Solutions supports the application through its European service network and expanding North American presence.

Key Takeaways

  • Electric bus compressor systems provide compressed air for braking, suspension, automatic doors and other pneumatic vehicle functions.
  • The TX02 compressor platform offers both air- and water-cooled configurations for different EV requirements.
  • Operating pressure for the vehicle system in this application ranges from 8 to 12 bar.
  • Inverter-equipped and water-cooled variants improve energy management and reduce overall power consumption.
  • The modular platform supports standardized compressor technology across multiple vehicle configurations.
  • CAN-based integration supports real-time diagnostics, predictive maintenance and adaptive performance tuning.
  • The water-cooled TX02 provides higher power density and quieter operation for applications where installation space, heat dissipation and noise are important.
  • The compressors can also be used on other commercial EV platforms, including delivery trucks and specialty vehicles.

Download the Electric Bus Compressor Case Study

Discover how TX Series electric compressor systems can support energy-efficient pneumatic operation across electric public transport platforms.

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Frequently Asked Questions

Electric bus compressors generate compressed air for pneumatic systems such as braking, air suspension and automatic door actuation. In some vehicle configurations, compressed air can also support driver seat adjustment.

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