Latch Relay Power Control for High Speed Vehicles

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Solution Overview

Problem

Existing power control systems for high-speed vehicles using latch relays face issues with continuous power consumption, inability to block or release load power without processor initialization, and risk of latch relay damage due to prolonged coil energization.

Innovation Solution

A system and method that includes a latch relay, a communication part, and a pulse generator to output a one-shot pulse for turning on the latch relay, with a processor controlling its operation upon initialization, ensuring power blocking is released before processor startup and preventing coil damage by hardware-driven power supply to vehicle loads.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a latch relay is controlled by a processor, then power blocking can be released after initialization, but power cannot be blocked or released when the processor is not driven (before initialization or during processor error)

Engineering Contradiction:

Improvepower blocking control reliabilityVSAvoidpower blocking operation availability

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The power control system is segmented into two independent parts: a hardware-based latch relay control circuit that operates autonomously, and a processor-based control system that operates after initialization. The latch relay circuit can function independently without processor intervention, ensuring power blocking operations are available even before processor initialization or during processor failures.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The latch relay control circuit is designed to be self-sufficient, using internal circuitry (including a one-shot multivibrator and flip-flop) to generate control signals without requiring processor intervention. This self-service capability ensures the system can block or release power independently of processor status.

Inventive Principle:

Principle #25Self-service

2Reliability

If the latch relay coil is energized for prolonged periods (exceeding 1 minute), then the latch relay may be damaged or burned out, but there was no preparation for this scenario in the related art

Engineering Contradiction:

Improvelatch relay durabilityVSAvoidcoil energization time

Core Design Contradiction:

ReliabilityVSDuration of action of moving object

Solution Approach 1:

The system incorporates feedback mechanisms through the processor that monitors latch relay operation status. When the processor is initialized, it can detect prolonged energization conditions and send control signals to de-energize the latch relay coil, preventing damage from excessive heating.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system prepares for potential prolonged energization issues by implementing protective control logic in advance. The processor-based control system can preemptively shut down the latch relay if abnormal operation is detected, preventing damage before it occurs.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Loss of energy

If the door control module power is blocked, then dark current is blocked, but the door cannot be opened until processor booting completes

Engineering Contradiction:

Improvedark current blockingVSAvoiddoor opening time

Core Design Contradiction:

Loss of energyVSLoss of time

Solution Approach 1:

The latch relay control circuit is designed to respond immediately to door opening requests even before processor initialization completes. The hardware-based control can preliminarily activate the door actuator without waiting for processor booting, significantly reducing door opening time while maintaining dark current blocking through the latch relay mechanism.

Inventive Principle:

Principle #10Preliminary action

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 solution improves door opening speed, prevents latch relay damage, and ensures fail-safe power blocking even when the processor is not operational, enhancing dark current blocking and door opening efficiency.

Implementation Method 1

a latch relay configured to supply power to a vehicle load or to block power to the vehicle load

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

a pulse generator configured to output a one shot pulse that turns on the latch relay

Methodology Applied

Scientific EffectElectrical pulse generation:

Data Source

PatentUS10297406B2System and method for controlling power of high speed vehicle

Publication Date: 2019.05.21 HYUNDAI MOTOR CO LTD

AI summary

There are provided a system and a method for controlling power of a high speed vehicle. The system for controlling power of a vehicle includes: a latch relay configured to supply power to a vehicle load or to block power to the vehicle; a communication part configured to output a driving signal when a wakeup signal is received; a pulse generator configured to output a one shot pulse that turns on the latch relay when the driving signal is applied; and a processor configured to control a driving of the latch relay turned on by the one shot pulse when being initialized.