Vehicle Power Generation Control Device Rattle Suppression
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Solution Overview
Problem
In vehicles with electric motors powered by generators, low load torque conditions can lead to rattling noise due to gear mechanism backlash, which may be misinterpreted as a vehicle failure, especially at low engine rotational speeds.
Innovation Solution
A power generation control device that includes an internal combustion engine, a generator, a gear mechanism, a detection unit, and a power generation controller, which sets a target power generation amount and adjusts the engine's rotational speed to a predetermined level to suppress rattling noise by mixing it with the engine sound.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the generator operates with extremely reduced load torque to match small target power generation amount, then power generation efficiency is improved, but rattling noise occurs due to gear mechanism backlash
Solution Approach 1:
The control device applies preliminary anti-action by detecting when the generator operates in a co-rotation state (extremely reduced load torque) and proactively increasing engine rotational speed before significant rattling noise occurs. This preemptive speed increase prevents the gear mechanism backlash from causing noticeable rattling noise while maintaining efficient power generation operation.
Solution Approach 2:
The invention changes the engine rotational speed parameter dynamically based on generator load conditions. When the generator operates with extremely reduced load torque, the control device increases engine rotational speed to a predetermined value, thereby changing the operating parameters of both the engine and generator to eliminate rattling noise while preserving power generation efficiency.
2Object-generated harmful factors
If engine rotational speed is increased to suppress rattling noise, then noise suppression is improved, but fuel consumption increases
Solution Approach 1:
The control device applies partial action by increasing engine rotational speed only to the extent necessary to suppress rattling noise, rather than maintaining continuously high speed. The engine speed is increased to a predetermined value only when the generator operates in co-rotation state, and returned to normal when load torque increases, thereby minimizing fuel consumption while effectively suppressing noise.
Solution Approach 2:
The invention implements periodic action by dynamically adjusting engine rotational speed based on real-time generator load conditions. The engine speed is increased periodically only when rattling noise conditions are detected (extremely reduced load torque), and returned to normal operating speed when conditions improve, creating an on-demand noise suppression strategy that minimizes energy loss.
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
Effectively suppresses the rattling noise from the gear mechanism, preventing users from misidentifying it as a vehicle failure and maintaining comfortable engine operation.
Implementation Method 1
a generator (12) driven by the internal combustion engine (11)
Data Source
AI summary
A power generation control device includes:an internal combustion engine of a vehicle;a generator driven by the internal combustion engine to generate electricity;a power storage device charged by the generator;a gear mechanism that interconnects the internal combustion engine and the generator;a detection unit for detecting vehicle information of the vehicle;a power generation controller that sets a target power generation amount of the generator based on the vehicle information and calculates a target rotational speed of the internal combustion engine and a load torque of the generator according to the target power generation amount; anda rattle suppression controller which determines whether a rattle suppression control condition of the gear mechanism is satisfied or not based on the target power generation amount and raises the target rotational speed of the internal combustion engine to a predetermined rotation number when the condition is satisfied.