Secondary Control Unit for Variable Displacement Engine Fuel Economy
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Solution Overview
Problem
Aftermarket modifications to automobile engine control units to improve fuel efficiency risk damaging the engine and voiding warranties, as they alter factory settings without ensuring safe operational boundaries.
Innovation Solution
A secondary control unit (SCU) that communicates with vehicle controllers to send control commands for engine operation while preserving factory settings, allowing for improved fuel efficiency without risking engine damage by determining optimal engine displacement modes based on real-time data during vehicle operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If factory look-up tables and control algorithms in the engine control unit are overwritten to improve fuel efficiency, then fuel economy is improved, but the engine warranty is voided and engine damage risk increases
Solution Approach 1:
A secondary control unit is introduced as an intermediary device that communicates with the factory engine control unit through the OBD-II port. The secondary control unit sends control commands to the engine while the factory control unit retains authority to reject commands that violate manufacturer specifications, thus mediating between fuel efficiency improvements and engine protection
Solution Approach 2:
The control system is segmented into two independent parts: the factory engine control unit that maintains warranty-compliant operations, and the secondary control unit that provides fuel efficiency optimizations. This segmentation allows both goals to coexist without compromising engine safety or warranty
2Use of energy by moving object
If aftermarket devices are installed to modify engine performance, then fuel efficiency is improved, but the risk of engine damage and warranty voidance increases
Solution Approach 1:
The secondary control unit continuously monitors engine parameters through communication with the factory control unit and adjusts control commands based on real-time engine state. The factory control unit provides feedback by accepting or rejecting commands based on manufacturer specifications, creating a feedback loop that prevents harmful modifications
Solution Approach 2:
The system dynamically adjusts engine control parameters based on real-time operating conditions while maintaining adaptability within manufacturer-approved boundaries. The secondary control unit can modify engine performance on-the-fly without permanent changes to the factory control unit, allowing dynamic optimization without compromising engine safety
Data Source
AI summary
A secondary controller for controlling the performance of a moving automobile is described. The secondary controller can be configured to communicate with one or more vehicle controllers, such as the engine control unit, while the automobile is being driven. The secondary controller can send control commands, such as self-test or diagnostic commands to the vehicle controller to effect the operation of the vehicle's power train. The secondary controller can receive power train related data from the engine control unit and based upon the received power train data determine when to send the control commands. In one embodiment, the secondary controller communicates with the vehicle controller via the vehicle's diagnostic port, such as an OBD-II port. In another embodiment, the secondary controller can be configured to control a variable displacement engine in a vehicle to improve the fuel efficiency of the vehicle while it is driven.