Vehicle Mode-Based Software Scheduling for Hybrid Control Processors
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Solution Overview
Problem
As vehicles become more complex, the supervisory hybrid control processor (HCP) becomes overloaded, leading to increased costs with higher performance processors or drivability issues with reduced function frequency, necessitating improved vehicle mode triggered control systems.
Innovation Solution
Implement a vehicle mode triggered control system where certain sub-systems operate only during specific modes, allowing application functions to be executed at different rates based on the vehicle's operating mode, with inactive sub-systems being executed at a slower rate or not at all until activated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If higher performance processors are implemented, then processing capability is improved, but vehicle cost increases
Solution Approach 1:
The system dynamically adjusts the execution rate of application functions based on vehicle operating mode. During modes where certain subsystems are inactive, corresponding application functions are executed at a slower rate (second rate), while functions related to active subsystems are executed at a faster rate (first rate). This dynamic execution strategy optimizes processor utilization without requiring higher performance hardware.
2Productivity
If application function frequency is decreased, then HCP overload is reduced, but drivability deteriorates
Solution Approach 1:
The system applies different execution rates to different sets of application functions based on vehicle operating mode. The first set of application functions (related to inactive subsystems) is executed at a slower second rate, while the second set of application functions (related to active subsystems) is executed at a faster first rate. This localized differentiation maintains drivability for critical functions while reducing overall processor load.
3Reliability
If application functions are executed at higher rate, then drivability is maintained, but HCP overload increases
Solution Approach 1:
The system implements periodic execution of application functions at different rates based on vehicle operating mode detection. The HCP detects the current operating mode and adjusts execution rates accordingly, creating a periodic pattern of high-rate execution during critical modes and low-rate execution during non-critical modes. This periodic variation maintains drivability when needed while reducing overall processor utilization.
Data Source
AI summary
A vehicle mode triggered control system for a vehicle includes a hybrid control processor (HCP) configured to detect a current operating mode of the vehicle, determine a set of inactive sub-systems of a set of sub-systems of the vehicle that are not configured to operate during the current operating mode of the vehicle, wherein each of the set of sub-systems is configured to for limited mode-based operation and not during a full operating period of the vehicle, and execute application software including a plurality of application functions by executing a first set of application functions of the plurality of application functions at a first rate and executing a second set of application functions of the plurality of application functions at a slower second rate, wherein the second set of application functions are limited to one or more of the set of inactive sub-systems.