Hybrid Drive Start-Stop Control for Wear Reduction
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Solution Overview
Problem
Vehicles with hybrid drives experience high wear, fuel consumption, and uncomfortable operation due to frequent torque-load changes during start-stop operations in stop-and-go traffic, particularly with internal-combustion engines operating outside their ideal characteristic diagram.
Innovation Solution
A process for controlling start-stop operations in vehicles with hybrid drives, involving monitoring and analyzing performance parameters to automatically release and lock the electric parking brake, utilize the electric motor for starting and braking, and assist the internal-combustion engine, while activating the service brake and generator operation based on defined conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the internal-combustion engine is frequently started and stopped in stop-and-go traffic, then fuel consumption is reduced during stoppage times, but wear increases and the engine operates outside its ideal characteristic diagram
Solution Approach 1:
The electric motor acts as an intermediary component in the hybrid drive system. During start-stop operations, the electric motor provides auxiliary torque to the internal-combustion engine, enabling smoother transitions and reducing the mechanical stress and wear on the engine during frequent starting and stopping cycles in stop-and-go traffic
2Speed
If the internal-combustion engine is operated outside its ideal characteristic diagram during frequent start-stop operations, then the vehicle can respond quickly to traffic conditions, but fuel consumption increases
Solution Approach 1:
The hybrid drive system merges the internal-combustion engine with the electric motor to create a combined powertrain. During start-stop operations, both power sources work together, with the electric motor providing immediate torque response while the internal-combustion engine operates in more efficient ranges, thus maintaining quick response to traffic conditions while reducing overall fuel consumption
3Stability of the object's composition
If the parking brake is frequently operated during start-stop operations, then the vehicle remains stationary during stoppage times, but operating comfort decreases due to constant brake engagement
Solution Approach 1:
The patent replaces the mechanical parking brake system with an electric parking brake actuated by an electric motor. This electric actuation system provides smoother, more precise, and quieter brake engagement and release, eliminating the harsh mechanical sensations and improving operating comfort during frequent start-stop operations while maintaining the vehicle's stationary position
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This process reduces fuel consumption, increases operating comfort, and minimizes wear by optimizing the use of the electric motor and internal-combustion engine, ensuring efficient and safe start-stop operations, even in the event of brake system defects.
Implementation Method 1
an electric motor (3) for driving the vehicle (1)
Implementation Method 2
activating a generator operation of the electric motor (3)
Data Source
AI summary
A process for controlling a vehicle start-stop operation having a hybrid drive with an internal-combustion engine and an electric motor, a service brake with an ABS and an electric parking brake, includes: determining, monitoring and analyzing performance parameters of the vehicle, the internal-combustion engine, the electric motor, the service brake and the parking brake; automatically releasing the parking brake in the case of a starting prompt because of determined performance parameters; driving the vehicle by the electric motor for the start; starting the engine by the electric motor if the engine is switched off; driving the vehicle by the electric motor and the engine; activating a generator operation of the electric motor in the case of a braking prompt because of determined performance parameters; activating the service brake; and automatically locking the electric parking brake when the vehicle is stopped after a previously definable deceleration time.