Hybrid Vehicle Engine Start Timing Synchronization
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Solution Overview
Problem
In hybrid vehicles, the energy recovered during shifting is inefficiently transmitted to the Hybrid Start Generator (HSG) due to path loss, as it first charges the battery and then is outputted, resulting in only a fraction of the energy being usable for engine starting.
Innovation Solution
The method involves predicting near-future driving conditions and synchronizing the shift timing with engine start timing to directly transmit kinetic energy to the HSG or engine, bypassing battery charging, thereby reducing energy loss and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the energy recovered during shifting is transmitted to the HSG through battery charging, then the energy can be stored and used later, but significant path loss occurs reducing the usable energy fraction
Solution Approach 1:
The patent extracts the energy recovery process from the conventional battery charging path and creates a direct transmission path from the drive shaft to the HSG. This removes the intermediate battery charging/discharging steps that cause path loss, allowing kinetic energy to be directly converted to electrical energy in the HSG without the inefficiencies of dual energy conversions.
Solution Approach 2:
The patent introduces a control system as an intelligent intermediary that coordinates the shift timing with engine start timing. This mediator optimizes the energy transmission path by determining when to bypass the battery and when to use direct transmission, based on real-time vehicle operating conditions and energy requirements.
2Productivity
If the shift timing is synchronized with engine start timing to directly transmit kinetic energy to the HSG, then energy efficiency improves, but precise timing control becomes more difficult
Solution Approach 1:
The control system performs preliminary analysis of driving conditions and predicts optimal shift timing before the actual shift occurs. By pre-calculating the ideal synchronization point between shift and engine start events, the system prepares the energy transmission path in advance, ensuring maximum energy recovery efficiency while simplifying the real-time control execution.
Solution Approach 2:
The patent implements a feedback mechanism where the control system continuously monitors actual shift timing, engine start timing, and energy recovery effectiveness. This feedback loop allows the system to adjust and refine the synchronization timing based on real-world performance data, progressively optimizing the timing coordination to achieve better energy efficiency.
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 approach enhances the utilization of recovered energy for engine starting, reducing electric energy consumption and improving overall energy efficiency by directly using kinetic energy for engine cranking without the inefficiencies of battery charging and discharging.
Implementation Method 1
the starter/generator motor 20 serves as a starter motor when the engine is started... the battery is charged through the motor using the driving force of the wheels in the vehicle, which is referred to as braking energy regeneration
Data Source
AI summary
A method of controlling a hybrid vehicle for reducing path loss of energy when recovered energy at the time of gear shifting is transmitted to a hybrid start generator includes steps of determining a currently required torque and a predicted acceleration at a near-future time, determining a predicted speed at the near-future time based on a current speed and the predicted acceleration, determining when it is determined that one of engine start and shift conditions is satisfied at a current time based on at least one of the required torque and the current speed, whether the remaining one of the engine start shift conditions is satisfied at the near-future time, and controlling an event corresponding to the satisfied condition at the current time is delayed or an event corresponding to the satisfied condition at the near-future time is advanced when the remaining one condition is satisfied.