Measuring fuel consumption of combustion engines on a chassis, engine and powertrain test stands
EXFM-ONE
Ultrasonic Exhaust Flow Meter for Real-Time Emissions Measurement
Accurate mass-emissions measurement requires exhaust-flow data that can keep pace with rapid changes in engine and vehicle operation. The EXFM-ONE measures exhaust gas flow directly from a vehicle or engine in real time, helping engineers capture transient flow behavior and calculate raw exhaust mass emissions.
Using ultrasonic measurement technology, the EXFM-ONE provides a wide flow range from 0 to 10 m³/min and a response time of less than 0.5 seconds (t₁₀–₉₀). Combined with the MEXA-ONE, Motor Exhaust Gas Analyzer, it supports real-time mass-emissions measurement and detailed analysis of engine and catalyst behavior.
The EXFM-ONE can also provide flow control data for partial-flow dilution systems such as the MDLT or BMD. When paired with an optional air-to-fuel ratio analyzer, it enables real-time fuel-consumption evaluation without requiring a dedicated fuel-flow measurement system.
As part of HORIBA ONE PLATFORM, the EXFM-ONE can be integrated with other compatible HORIBA measurement systems through a common user interface. This enables centralized control, monitoring and management of measurement and quality-check results while supporting efficient test-system operation.
Real-Time Exhaust Flow Measurement
- Measures exhaust gas flow directly from a vehicle or engine
- Wide measurement range from 0 to 10 m³/min
- Less than 0.5-second t₁₀–₉₀ response
- Captures rapid flow changes during transient test cycles
- Provides flow data for real-time emissions mass calculations
- Supports testing from idle through high-speed driving conditions
Raw Exhaust Mass-Emissions Measurement
When combined with a compatible exhaust gas analyzer, the EXFM-ONE provides the flow data required to convert measured gas concentrations into real-time mass emissions.
- Integrates with the MEXA-ONE (Motor Exhaust Gas Analyzer)
- Supports synchronized exhaust-flow and concentration measurement
- Enables engine and catalyst behavior analysis during transient operation
- Helps engineers evaluate short-duration events such as fuel shut-off
- Supports medium- and light-duty engine development
Partial-Flow Dilution System Integration
- Provides flow-control data for partial-flow sampling systems
- Supports particulate matter and emissions measurement
- Integrates with systems such as the MDLT Partial Flow Dilution Tunnel
- Can be combined with a BMD Bag Mini Diluter
- Supports vehicle and engine test applications
Real-Time Fuel-Consumption Evaluation
When combined with an optional air-to-fuel ratio analyzer, the EXFM-ONE can calculate fuel consumption using measured exhaust-flow and air-fuel-ratio data.
- Provides instantaneous fuel-consumption measurement
- Supports transient vehicle and engine testing
- Enables comparison of fuel consumption with operating conditions
- Applicable to chassis, engine and powertrain test stands
Integrated with HORIBA ONE PLATFORM 
- Operate the EXFM-ONE and other compatible systems through a common interface
- Centralize measurement and quality-check results on one display
- Monitor connected emissions measurement devices
- Improve coordination across the testing process
- Connect to HORIBA ONE PLATFORM or directly to a host computer
Measurement Performance
Measurement results demonstrate strong correlation across a wide operating range and rapid response during sudden changes in exhaust flow.
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Rapid response following fuel shut-off |
Research and Development Applications
- Real-time mass-emissions measurement
- Medium- and light-duty engine development
- Vehicle emissions research and development
- Engine and catalyst behavior analysis
- Transient test-cycle evaluation
- Particulate matter measurement using partial-flow dilution
- MDLT and BMD flow control
- Instantaneous fuel-consumption evaluation
- Chassis, engine and powertrain testing
