Vehicle Control Device Cooling Failure Management
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Solution Overview
Problem
Existing vehicle control devices fail to effectively prevent engine overheat and exhaust gas characteristic deterioration when the grill shutter fails, leading to excessive enrichment of the air fuel ratio and reduced drivability.
Innovation Solution
A control device for vehicles with a failure detection system for the cooling device, an acceleration operation amount sensor, and circuitry that limits engine output and prohibits air fuel ratio enrichment when a failure is detected, ensuring the air fuel ratio does not become richer than a predetermined ratio even during high load conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the air fuel ratio is controlled to be richer during high load acceleration, then the engine output and drivability are improved, but the engine overheating risk increases when the cooling device fails
Solution Approach 1:
The control device applies preliminary anti-action by detecting cooling device failure in advance and preemptively prohibiting air fuel ratio enrichment, even before engine temperature reaches critical levels. This prevents the harmful effect of overheating before it can occur during high load conditions.
Solution Approach 2:
The system converts the harmful condition of cooling device failure into a beneficial control state by using the failure detection signal to trigger protective air fuel ratio control, transforming a potentially dangerous situation into one where the engine is protected from overheating through automated control.
2Power
If the air fuel ratio is enriched during high load conditions, then the engine power is increased, but the exhaust gas characteristics deteriorate when the cooling device fails
Solution Approach 1:
The control device applies preliminary anti-action by detecting cooling device failure in advance and preemptively prohibiting air fuel ratio enrichment, even before engine temperature reaches critical levels. This prevents the harmful effect of overheating before it can occur during high load conditions.
3Ease of operation
If the engine output is not restrained during cooling device failure, then the driver's acceleration demand is met, but the engine overheating and drivability are compromised
Solution Approach 1:
The control device uses feedback from the cooling device failure detection to continuously monitor and adjust engine output control. The system receives feedback about the cooling device status and automatically adjusts air fuel ratio control to maintain engine reliability while attempting to preserve drivability.
Solution Approach 2:
The control system applies self-service by automatically detecting cooling device failure and implementing protective measures without requiring driver intervention. The system serves itself by using its own failure detection capability to trigger appropriate control actions.
Data Source
AI summary
A control device for a vehicle includes a failure detector to detect failure in a cooling device to cool an internal combustion engine of the vehicle. An acceleration operation sensor is to detect an acceleration operation amount indicating a target acceleration. Circuitry is configured to control a power output from the internal combustion engine in accordance with the acceleration operation amount, control an air fuel ratio of air-fuel mixture in the internal combustion engine to be in a richer side with respect to a predetermined air fuel ratio if the acceleration operation amount exceeds a high load threshold, limit the power output from the internal combustion engine if the failure detector detects the failure, and prohibit the air fuel ratio from being controlled to be in the richer side even if the acceleration operation amount exceeds the high load threshold if the failure detector detects the failure.