Parallel Hybrid Torque Distribution for Initial Movement
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Solution Overview
Problem
Current parallel hybrid systems for motor vehicles face challenges in reducing energy losses and environmental impact during the initial movement phase, which also leads to increased wear on mechanical components.
Innovation Solution
A method that utilizes both the combustion engine and electrical machine to propel the vehicle during the initial movement phase, with the electrical machine acting as both a motor and generator, optimizing torque distribution based on speed, energy store state, and clutch conditions to minimize energy losses and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the combustion engine alone is used during initial movement phase, then the vehicle can be propelled, but energy losses increase and environmental emissions increase
Solution Approach 1:
The patent combines the combustion engine and electrical machine to operate simultaneously during the initial movement phase. The control system coordinates both power sources to provide combined torque, reducing the energy losses associated with using the combustion engine alone while maintaining effective vehicle propulsion.
Solution Approach 2:
The electrical machine serves multiple functions: it acts as a motor to assist propulsion during initial movement, reducing combustion engine load and energy losses, and later serves as a generator during braking to recharge the battery. This multi-functionality addresses both energy loss reduction and overall system efficiency.
2Object-generated harmful factors
If the combustion engine alone is used during initial movement phase, then the vehicle can be propelled, but environmental emissions increase
Solution Approach 1:
By merging the power output of the combustion engine and electrical machine during initial movement, the system reduces reliance on the combustion engine alone, thereby lowering harmful emissions while maintaining the necessary propulsion capability through combined torque delivery.
3Reliability
If the mechanical clutch is used alone during initial movement, then the vehicle can be propelled, but wear on the clutch increases
Solution Approach 1:
The control system merges the torque contribution from the electrical machine with that of the combustion engine during initial movement. This shared torque burden reduces the stress and wear on the mechanical clutch while maintaining the vehicle's ability to move effectively from stationary conditions.
4Loss of energy
If the electrical machine serves as generator during braking, then the battery can be charged, but energy losses occur in the conversion process
Solution Approach 1:
The system converts the kinetic energy that would otherwise be lost during braking into electrical energy to charge the battery. By utilizing the electrical machine as a generator during deceleration, the system recovers energy that would be wasted as heat in conventional friction braking, thereby reducing overall energy losses while increasing battery charge level.
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 reduces energy losses and environmental emissions during initial movement, improves vehicle performance, and extends the life of mechanical components by sharing propulsion duties between engines, thereby enhancing the overall efficiency and sustainability of the hybrid system.
Implementation Method 1
an electrical machine configuration which includes an electrical machine provided with power supply
Implementation Method 2
The electrical machine can in a conventional way, during operation with chosen gear steps engaged in the vehicle's gearbox, serve as a generator to charge the battery during braking of the vehicle
Implementation Method 3
a combustion engine which has an output shaft connected to a mechanical clutch
Data Source
Figure 1~2
Figure 3
Figure 4a~4b
AI summary
The invention relates to a method pertaining to a parallel hybrid system (299) for propulsion of a motor vehicle (100; 110) comprising a combustion engine (230) in combination with an electrical machine configuration (250, 253, 255) which includes an electrical machine (250) provided with power supply, comprising the step, during an initial movement phase of the vehicle's propulsion, of using both the combustion engine (230) and the electrical machine (250) of the electrical machine configuration to propel the vehicle (100; 110). The method comprises also the step, during said initial movement phase, of continuously distributing torque extracted respectively from the combustion engine (230) and said electrical machine (250) on the basis of the electrical machine's speed (N). The invention relates also to a computer programme product containing programme code (P) for a computer (210; 220) to implement a method according to the invention. The invention relates also to a parallel hybrid system and a motor vehicle which is equipped with the parallel hybrid system.