Vehicle Temperature Regulation via DC Sequence Heating
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Solution Overview
Problem
Large off-highway vehicles operating in extreme cold conditions face challenges in maintaining engine and drive system component temperatures, leading to performance degradation and potential damage due to insufficient heat generation from the diesel engine during idle or parked states.
Innovation Solution
A temperature regulation system that includes a control unit coupled with the engine and drive system, which monitors reference temperatures and automatically applies additional load to the engine or fires power semiconductor switches in a DC sequence to maintain optimal operating temperatures without causing the traction motors to move the vehicle, thereby preventing damage and optimizing fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the diesel engine operates at idle or parked state in extreme cold, then fuel consumption is reduced, but the engine cannot generate enough heat to maintain operating temperature
Solution Approach 1:
The control system applies additional load to the engine before it is actually needed to prevent temperature from dropping below minimum operating conditions. This proactive heating approach ensures the engine reaches and maintains optimal temperature range before normal operation begins, avoiding the need for prolonged idle warming.
Solution Approach 2:
The control system periodically monitors engine temperature and alternates between idle state and heated state by applying periodic additional loads. This periodic cycling allows the engine to consume less fuel during idle periods while ensuring temperature is maintained through intermittent heating cycles when temperature drops approach the minimum threshold.
2Temperature
If additional load is applied to the engine to maintain temperature, then operating temperature is maintained, but fuel efficiency decreases
Solution Approach 1:
The control system continuously monitors engine temperature and uses this feedback to determine when additional heating load is necessary. By comparing real-time temperature data against minimum operating thresholds, the system applies additional load only when temperature approaches critical levels, rather than maintaining constant high-load operation. This feedback-driven approach minimizes unnecessary fuel consumption while ensuring temperature remains within optimal operating range.
3Temperature
If power semiconductor switches are fired in DC sequence to heat drive system components, then component temperature is maintained, but traction motors cannot move the vehicle
Solution Approach 1:
The control system dynamically switches between two operational modes: a heating mode where power semiconductor switches are fired in DC sequence to warm drive system components, and a mobility mode where switches operate in AC sequence to enable traction motor operation. This dynamic switching allows the system to optimize for either temperature maintenance or vehicle movement based on current operational requirements, preventing component damage while restoring mobility when needed.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively maintains engine and drive system temperatures above a predetermined threshold, preventing damage and optimizing fuel burn, even in extreme cold conditions, without requiring operator input, and operates in both static and dynamic conditions.
Implementation Method 1
one or more power converters having one or more power semiconductor switches, to convert power produced by the engine into electrical power for use by at least one traction motor of the vehicle
Implementation Method 2
automatically regulate a temperature of the power semiconductor switches by firing the power semiconductor switches in a manner that does not cause the at least one traction motor to move the vehicle
Data Source
AI summary
A temperature regulation system for a vehicle includes a drive system configured to be coupled to an engine of the vehicle. The drive system is configured to convert power produced by the engine into electrical power for use by at least one traction motor of the vehicle. The system further includes a control unit for controlling the engine and drive system. The control unit is configured to automatically regulate a temperature of a vehicle component in dependence upon a detected reference temperature.