Vehicle Temperature Door Drive for Quiet Wide-Angle Control

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Solution Overview

Problem

Conventional vehicle air conditioners face limitations in controlling the operational range and movement of the temperature door, generating noise, and experiencing shaking and vibration due to structural constraints and wind pressure, with limited mold applicability and precision in temperature control.

Innovation Solution

A vehicle air conditioner with a driving unit comprising asymmetric gear parts and an actuator to rotate the temperature door, preventing sudden angle changes and optimizing gear ratios for precise temperature control in both cooling and heating areas, allowing for expanded operational range and reduced noise.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a slot-type power transmission means is used to drive the temperature door, then the door can be rotated to control air flow, but the structure generates noise at transition sections and limits the operational range to less than 100°

Engineering Contradiction:

Improveoperational range of temperature doorVSAvoidnoise generation

Core Design Contradiction:

Ease of operationVSObject-generated harmful factors

Solution Approach 1:

The patent replaces the conventional slot-type mechanical power transmission means with a cam-type mechanism. The cam profile is specifically designed to provide smooth continuous motion to the temperature door, eliminating the sudden transitions and impact noises generated by the slot-type mechanism. This substitution maintains the rotational control function while significantly reducing noise and expanding operational range.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the motion profile parameters by using a carefully designed cam profile instead of a fixed slot geometry. The cam profile parameters are optimized to provide gradual acceleration and deceleration of the temperature door throughout its rotation, preventing sudden angle changes that cause noise. This allows the door to operate smoothly over an extended range exceeding 100°.

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If the slot shape is modified to adjust door movement, then temperature control characteristics can be optimized for one vehicle type, but mold modification is required and the solution cannot be applied to other vehicle types

Engineering Contradiction:

Improvetemperature control characteristicsVSAvoidapplicability to different vehicle types

Core Design Contradiction:

Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

The patent designs the cam-type power transmission means with standardized dimensions and mounting interfaces that can be universally applied across different vehicle types. The cam profile can be adjusted through parameter changes rather than physical mold modifications, allowing the same basic structure to serve multiple vehicle models while maintaining optimized temperature control characteristics.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent introduces adjustability into the cam mechanism, allowing the cam profile parameters to be dynamically modified to match different temperature control requirements of various vehicle types. This enables a single mold design to produce components that can be adapted to different applications through parameter adjustment rather than requiring dedicated molds for each vehicle type.

Inventive Principle:

Principle #15Dynamics

3Ease of operation

If the temperature door is driven with conventional power transmission means, then the door can rotate to adjust air flow paths, but shaking and vibration occur depending on door position due to wind pressure

Engineering Contradiction:

Improveair flow path adjustmentVSAvoiddoor stability under wind pressure

Core Design Contradiction:

Ease of operationVSStability of the object's composition

Solution Approach 1:

The patent replaces the slot-type lever mechanism with a cam-driven system that provides more stable and controlled motion. The cam profile is designed to maintain continuous contact and smooth force transmission to the temperature door, reducing the shaking and vibration that occur with the conventional mechanism under wind pressure loads.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The cam profile is pre-designed to anticipate and compensate for wind pressure effects on the temperature door. The curvature and timing of the cam profile provide buffering against sudden pressure changes, reducing vibration and shaking before they can significantly affect door stability during operation.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Data Source

PatentUS20250010686A1Vehicle air conditioner

Publication Date: 2025.01.09 HANON SYST CO LTD

AI summary

A vehicle air conditioner which controls the operating range and movement of a door through the feedback revision of an actuator includes an air-conditioning case having an air inflow port and an air discharge port for discharging air to the interior space of a vehicle; a cooling heat exchanger and a heating heat exchanger provided on an inner air flow path of the air-conditioning case; a temperature door rotatably between the cooling heat exchanger and the heating heat exchanger to control the discharge temperature of the air, and a rotating means for preventing a sudden change in the angle of the temperature door between cooling mode and heating mode periods.