Refrigerator-Freezer Vehicle Torque Control for False-Start Prevention
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Solution Overview
Problem
In freezing vehicles, the engine torque changes due to the refrigerating/freezing chamber load, leading to unstable false-start prevention effects, especially when the accelerator pedal is mistakenly depressed, risking unintended movement.
Innovation Solution
A refrigerator/freezer vehicle with an engine control unit and refrigerating/freezing chamber that sets a constant or zero torque demand value for the compressor during false-start prevention, using obstacle detection and vehicle speed to stabilize engine torque suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the engine torque suppression function is actuated with normal torque allocation to the compressor, then the false-start prevention effect is strong, but the cooling performance becomes unstable when the refrigerating/freezing chamber is actuated
Solution Approach 1:
The patent changes the torque demand parameter allocated to the compressor from its normal variable value to a constant value or zero during false-start prevention actuation. This parameter change ensures that the compressor receives sufficient torque to maintain stable cooling operation even when the engine torque is suppressed for false-start prevention, thereby resolving the contradiction between strong false-start prevention and stable cooling performance.
2Stability of the object's composition
If the torque demand allocated to the compressor is reduced during false-start prevention, then the vehicle stability is improved, but the false-start prevention effect is impaired
Solution Approach 1:
The patent applies parameter change by setting the torque demand value for the compressor to a constant value or zero during false-start prevention actuation. This ensures that the compressor receives adequate torque allocation independently of the engine torque suppression, maintaining both vehicle stability through proper torque management and effective false-start prevention through sufficient compressor operation.
Data Source
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AI summary
[Problem to be Solved] Provided is a refrigerator/freezer vehicle that makes it possible to obtain a stable false-start prevention effect regardless of the actuation situation of a refrigerating/freezing chamber. [Solution] A refrigerator/freezer vehicle (1) includes: an engine control unit (10) to control an engine (12) depending on torque demand; and a refrigerating/freezing chamber (2) to perform cooling by a compressor (22) that is actuated by output of the engine, the refrigerator/freezer vehicle having a function (30) to suppress engine torque when an accelerator pedal is operated in a state in which an obstacle is detected within a predetermined distance in a movement direction at a predetermined low vehicle speed or lower, in which the refrigerator/freezer vehicle is configured to set a constant value or zero as a torque demand value to be allocated to the compressor, at time of actuation of the engine torque suppression function.