Explore the RHINO EREV System
Under the skin of the RHINO is an extended-range electric architecture designed for Africa’s roads, energy grids, and business models. Here is how the system works — and why it matters.
What is an Extended-Range Electric Vehicle (EREV)?
An Extended-Range Electric Vehicle (EREV) is an electric vehicle where the wheels are driven by an electric motor, and a small combustion engine is used only as a generator to recharge the battery on the move.
In the RHINO:
- The wheels are always powered by the electric motor.
- The onboard generator acts as a “power assistant” when the battery SoC drops.
- The driver simply drives — the energy management is handled by AOI’s control strategy.
This allows African drivers and fleets to enjoy smooth, silent electric drive, **without** being blocked by limited charging infrastructure.
EREV Energy Flow – From Fuel and Grid to the Wheels
The RHINO’s energy system is built around one simple idea: use electricity whenever possible, and use fuel as a backup to protect range and uptime.
- Primary source: battery pack charged from grid, solar, or generator.
- Support source: onboard range-extender generator that turns fuel into electricity.
- Recovery source: regenerative braking recovering energy during deceleration.
- Output: all energy flows through the power electronics into the electric motor that drives the wheels.
Why EREV vs. Classic BEV or Hybrid?
Compared to Pure BEVs
- Less dependent on dense fast-charging networks.
- Smaller battery pack → lower upfront cost.
- Fleet operators avoid “range anxiety” and charging bottlenecks.
Compared to Conventional Hybrids
- Wheels are always electrically driven → smoother and more efficient drive.
- Easier to upgrade battery pack and software over time.
- Clear path to future pure-EV or fuel-cell evolution.
Perfect Fit for Africa
- Matches mixed urban–rural duty cycles and long intercity routes.
- Tolerant of grid instability and diesel-generator reality.
- Supports gradual transition to greener grids and solar fleets.
RHINO EREV – Core System Components
1. Modular Battery Pack
AOI’s modular battery pack uses multiple small modules (e.g. 1.5 kWh units) that can be combined to reach the required capacity. Modules can be serviced individually, reducing downtime and replacement cost.
2. Electric Motor & Inverter
The traction motor and inverter convert DC energy from the battery into smooth, high-torque AC power at the wheels. High efficiency reduces both energy consumption and heat stress.
3. Range-Extender Generator
A compact, optimized combustion engine coupled to a generator. It does not drive the wheels mechanically; it simply tops up the battery when state of charge hits a defined threshold.
4. Power Electronics & Control
Supervisory controllers decide when to use battery, when to start the generator, and how to balance performance, efficiency, and component life — especially under hot African operating conditions.
5. Thermal Management
Dedicated cooling loops and airflow paths are designed to keep batteries, power electronics, and the generator within safe operating limits, even at 40–45°C ambient temperatures.
6. Regenerative Braking System
During deceleration, the RHINO recovers some of the vehicle’s kinetic energy and feeds it back into the battery, reducing brake wear and improving total energy efficiency.
Built Around Real African Drive Cycles
The RHINO EREV concept is based on realistic duty cycles: mixed city traffic, highway runs between regional hubs, and low-speed operation in congested or informal road networks.
- Urban segment: stop-and-go traffic, 30–50 km/h, high potential for regen.
- Highway segment: 80–110 km/h cruising between cities or industrial zones.
- Grade segment: hilly or ramp sections where generator strategy is critical.
AOI’s calculators and engineering tools use these patterns to size batteries, generators, and fuel tanks for fleet operators — from taxis and shuttles to corporate and government fleets.
Multi-Source Charging Strategy
In practice, African operators need flexibility more than anything. The RHINO platform is being designed to support:
- Home or depot AC charging using standard wall or commercial sockets.
- Solar-powered depots with battery storage for daytime fleet charging.
- Generator-backed sites where grid access is unstable or absent.
- Onboard generator charging during long trips to protect uptime.
This multi-source approach helps fleets maintain control of energy costs while gradually increasing the share of renewables over time.
Safety, Redundancy, and Maintainability
The RHINO is being engineered with a strong focus on safety, redundancy, and maintainability in markets where workshop expertise and spare parts logistics can be challenging.
- Modular pack design to isolate and replace faulty modules.
- Clear diagnostic paths for both electric and generator subsystems.
- Fail-safe strategies for overheating, overcurrent, and over-/under-voltage events.
- Standardized components where possible to simplify sourcing.
Explore RHINO with AOI Engineering Calculators
AOI provides interactive tools to help fleets and investors understand how the RHINO performs in real-world duty cycles, including:
- Battery Pack Sizer – dimension the RHINO pack from range and consumption targets.
- Drive Cycle Range Extender Calculator – analyze average power, EV-only range, and generator behavior.
- Charging Time & Multi-Source Charging Tools – estimate charge times from home, depot, or generator.
- Regen / Dynamic Braking Impact – estimate how much energy can be recovered in stop-and-go duty.
- Financing & Fleet TCO Models – convert technical models into business decisions.
Engineering an African Mobility Platform, Not Just a Vehicle
The RHINO EREV architecture is the foundation for future AOI vehicles and derivative platforms — from passenger shuttles and taxis to light commercial vehicles. As grids, policies, and financing evolve, the platform can evolve with them.