Rear Wheel Steering Voltage Stabilization
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Solution Overview
Problem
Rear wheel steering systems face voltage drops due to low temperatures, leading to reduced RPM and delayed steering of the rear wheel, affecting the system's ability to maintain target angles.
Innovation Solution
A rear wheel steering control system that includes a voltage detecting unit, a supplemental voltage circuit unit, and a control unit to compare battery voltage with the required voltage for the actuator, generating supplemental voltage through a PWM signal and energy storage in a coil and capacitor to stabilize the system's operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the RWS actuator is operated using only battery voltage, then the system structure remains simple, but voltage drop during low temperatures reduces RPM and delays steering response
Solution Approach 1:
The system performs preliminary action by detecting battery voltage in advance and activating the supplemental voltage circuit before the voltage drop affects actuator performance. The control unit monitors battery voltage and preemptively engages the DC-DC converter and capacitor when voltage falls below the threshold, ensuring voltage stability is maintained before critical operations are impacted.
Solution Approach 2:
The patent introduces a DC-DC converter and capacitor as intermediary components between the battery and the RWS actuator. These intermediaries buffer voltage fluctuations by converting battery voltage to a stable supplemental voltage and storing excess energy in the capacitor, thereby isolating the actuator from direct battery voltage variations and ensuring reliable operation.
2Reliability
If supplemental voltage circuit is activated, then voltage stability is improved during low temperatures, but the system complexity and energy consumption increase
Solution Approach 1:
The control unit performs preliminary detection of battery voltage and activates the supplemental voltage circuit only when voltage falls below the predetermined threshold. This conditional preliminary action ensures that energy-consuming components are activated only when necessary, avoiding unnecessary energy consumption while maintaining reliability when needed.
Solution Approach 2:
The system dynamically changes operational parameters by adjusting the duty cycle of the DC-DC converter based on the degree of voltage drop. When battery voltage is slightly below the threshold, the converter operates at lower power; when voltage drops further, it increases conversion intensity. This parameter adjustment optimizes energy consumption while maintaining actuator voltage within acceptable ranges.
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
Ensures stable voltage supply even during battery voltage drops, enabling normal operation of the rear wheel steering system by adjusting the duty ratio of the PWM signal to generate sufficient supplemental voltage.
Implementation Method 1
a coil storing energy supplied from the battery when the switch is turned on
Implementation Method 2
a capacitor receiving and charging the energy supplied from the battery and energy stored in the coil when the switch is turned off
Data Source
AI summary
A rear wheel steering control system for a rear wheel steering (RWS) system of a vehicle can include: a voltage detecting unit detecting a magnitude of a battery voltage of a battery of the vehicle; a supplemental voltage circuit unit generating a supplemental voltage that supplements the battery voltage; and a control unit comparing the magnitude of the battery voltage with a magnitude of a required voltage required for normally operating a rear wheel steering actuator of the RWS system, calculating a magnitude of the supplemental voltage based on the comparing of the magnitude of the battery voltage with the magnitude of the required voltage, and controlling the supplemental voltage circuit unit so as to generate the supplemental voltage according to the calculated magnitude.