Vehicle Control Apparatus for Boost Pressure and Engine Speed Management
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Solution Overview
Problem
In vehicles equipped with both internal combustion engines and electric motor-generators, excessive boost pressure can lead to increased engine speed and overcurrent, causing durability issues due to inadequate control over boost pressure adjustments, especially when considering the operation state of the electric motor-generator.
Innovation Solution
A control apparatus that adjusts the boost pressure of the internal combustion engine based on the operation state of both the engine and the electric motor-generator, setting a target boost pressure lower as the motor-generator's rotation speed increases to prevent excessive output torque and engine speed, using a variable boost pressure mechanism and negative torque control to maintain optimal engine operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the boost pressure of the internal combustion engine is increased to improve output torque, then the engine power increases, but the engine speed excessively rises causing overcurrent in the electric motor-generator and reducing component durability
Solution Approach 1:
The patent dynamically adjusts the target boost pressure based on the rotation speed of the electric motor-generator. When the motor-generator rotation speed increases, the target boost pressure is lowered to prevent excessive engine speed rise and overcurrent. This parameter change approach resolves the contradiction by adapting boost pressure to operational conditions, maintaining both power output and component durability.
Solution Approach 2:
The control apparatus continuously monitors the rotation speed of the electric motor-generator and uses this feedback to adjust the target boost pressure. This closed-loop feedback mechanism ensures that when the motor-generator operates at high speeds, the boost pressure is reduced accordingly, preventing excessive engine speed increases and protecting components from overcurrent damage while maintaining optimal power delivery.
2Device complexity
If the boost pressure is adjusted based only on the internal combustion engine operation state, then the engine control is simplified, but the electric motor-generator operation state is not considered leading to excessive engine speed and overcurrent
Solution Approach 1:
The control apparatus integrates control of both the internal combustion engine and the electric motor-generator into a unified system. The target boost pressure is determined considering both the engine operation state and the motor-generator rotation speed, making the control system multi-functional. This approach maintains reasonable complexity while ensuring both components operate within safe parameters, preventing overcurrent and durability issues.
3Use of energy by moving object
If the target boost pressure is set high to maximize engine output, then the fuel efficiency improves, but the engine speed excessively increases causing negative torque from the electric motor-generator to be insufficient for suppressing engine speed
Solution Approach 1:
The patent dynamically adjusts the target boost pressure based on the electric motor-generator's rotation speed. When the motor-generator rotates faster, the target boost pressure is reduced to ensure the negative torque from the motor-generator can effectively suppress excessive engine speed increases. This parameter adaptation maintains fuel efficiency while preventing engine speed from rising too high, ensuring the negative torque remains sufficient for speed control.
Data Source
AI summary
A vehicle is equipped with an internal combustion engine having a forced-induction apparatus with variable boost pressure, a first motor generator for generating electricity while applying negative torque to the engine, and a battery for storing the electricity generated by the first motor generator. During the operation of the engine, a target boost pressure is set lower as the rotational speed of the first motor generator is increased. The engine is controlled such that, with the boost pressure adjusted to the target boost pressure, the output torque of the engine has a required value determined by the accelerator operation amount. Further, while the output torque of the engine is adjusted to the required value, the magnitude of the negative torque by the first motor generator acting on the engine is adjusted such that the engine rotational speed has a target value.