Vehicle Cluster Control System Virtual RPM Shifting Delay

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Solution Overview

Problem

The existing cluster control systems in vehicles experience delays in displaying engine RPM during shifting operations due to CAN communication delays, leading to deteriorated shifting responsiveness and prolonged shifting times, which negatively impact the driver's perception of sporty shift performance.

Innovation Solution

A cluster control system that includes a cluster controller, an engine controller, and a transmission controller, where the transmission controller supplies virtual engine RPM based on shifting type and accelerator pedal displacement to improve responsiveness and shifting time perception, with the cluster controller displaying real engine RPM when the shifting flag is off.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If engine RPM is transmitted through CAN communication from engine controller to cluster, then real-time data transmission is achieved, but time delay is generated causing deteriorated shifting responsiveness

Engineering Contradiction:

Improvedata transmission accuracyVSAvoidshifting time delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The transmission controller pre-calculates and prepares virtual engine RPM values before actual shifting occurs, based on map data corresponding to different shifting types. When shifting is detected, the pre-prepared virtual RPM is immediately transmitted to the cluster, eliminating the time delay associated with real-time CAN communication from the engine controller.

Inventive Principle:

Principle #10Preliminary action

2Speed

If virtual engine RPM is displayed during shifting, then shifting responsiveness is improved, but device complexity increases due to additional transmission controller functions

Engineering Contradiction:

Improveshifting responsivenessVSAvoidcontrol system complexity

Core Design Contradiction:

SpeedVSDevice complexity

Solution Approach 1:

The transmission controller acts as an intermediary that generates virtual engine RPM values based on pre-stored map data corresponding to different shifting types. This intermediary approach allows the cluster to display sporty shift feel without requiring direct real-time communication with the engine controller during shifting, thereby improving responsiveness while keeping the system architecture relatively simple.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Measurement precision

If real-time engine RPM display is prioritized, then accurate shifting information is provided, but driver's sporty shift feel is compromised due to perceived delay

Engineering Contradiction:

Improveshifting information accuracyVSAvoiddriver sentiment perception

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The system changes the parameter displayed on the cluster by switching between real engine RPM (for accuracy) and virtual engine RPM (for sporty feel). During shifting events, the transmission controller provides virtual RPM values that are optimized to create the perception of rapid shifting, while maintaining accurate shifting information through the use of shifting flags and event detection.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9975428B2Cluster control system of vehicle and method thereof

Publication Date: 2018.05.22 HYUNDAI MOTOR CO LTD

AI summary

A cluster control system of a vehicle may include a cluster controller for controlling a cluster, an engine controller for controlling an engine and supplying an engine revolutions per minute (RPM) to the cluster controller, and a transmission controller for controlling a transmission and supplying a virtual engine RPM according to a shifting type to the cluster controller when a shifting event occurs.