Serial drive system with combustion engine as generator and condition-dependent fuel conditioning
The serial drive system with an isolated combustion engine and condition-dependent fuel conditioning addresses fuel supply and emission issues at low temperatures, enhancing reliability and reducing emissions by using an electrical intermediate circuit and two-stage fuel preheating.
Patent Information
- Authority / Receiving Office
- DE · DE
- Patent Type
- Utility models
- Current Assignee / Owner
- Filing Date
- 2026-02-06
- Publication Date
- 2026-04-09
AI Technical Summary
Existing internal combustion engines in vehicles and mobile work machines face challenges in maintaining stable fuel supply and reliable operation at low temperatures or varying conditions without mechanical connection to drive wheels, leading to emission instability and operational unreliability.
A serial drive system with a mechanically isolated combustion engine coupled to a generator, incorporating an electrical intermediate circuit, an electrical energy storage unit, and an electric drive motor, along with a two-stage fuel conditioning system for liquid oxygenated fuel, including a heat-coupled base load preheating and electrically operated auxiliary preheating, controlled by operating conditions.
Ensures stable operation and improved cold-start capability with reduced emissions by maintaining a stable fuel supply and operational reliability under varying conditions.
Abstract
Description
Technical field
[0001] The invention relates to serial drive systems, in particular for vehicles, mobile work machines or stationary units, in which an internal combustion engine is used exclusively for generating electrical energy and the driving operation is purely electric. Task
[0002] The task is to provide a serial drive system that enables robust, low-emission and reliable use of an internal combustion engine as a generator, while ensuring a stable fuel supply even at low temperatures or changing operating conditions. Solution
[0003] The problem is solved by a serial drive system with an internal combustion engine that is mechanically coupled exclusively to a generator and has no mechanical connection to drive wheels.
[0004] The system includes an electrical intermediate circuit with at least one electrical energy storage unit and at least one electric drive motor.
[0005] Furthermore, a fuel system for a liquid, oxygenated fuel is provided, wherein the fuel system has a condition-dependent fuel conditioning.
[0006] The fuel conditioning system is designed in two stages and includes a heat-coupled base load preheating system as well as an electrically operated auxiliary preheating system.
[0007] The fuel conditioning is controlled depending on at least one operating state of the drive system, in particular depending on driving operation, generator operation or stationary operation as well as fuel-related state variables. Advantage
[0008] The serial architecture and condition-dependent fuel conditioning enable stable operation of the combustion engine at defined operating points. Cold-start capability, operational reliability, and emission stability are improved without the need for a mechanical connection to the drive system. Example of implementation
[0009] The combustion engine drives a generator that feeds electrical energy into an intermediate circuit. The vehicle is propelled exclusively by an electric drive motor.
[0010] Waste heat from the combustion engine and / or the exhaust gas is used for base load preheating of the fuel.
[0011] At low temperatures or increased flow resistance in the fuel system, an electrically operated auxiliary preheating system is activated.