PTO-Driven Refrigeration Powertrain Without a Diesel Reefer Engine
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Solution Overview
Problem
Conventional semi-trailer refrigeration units require a dedicated diesel engine, leading to maintenance issues, fuel consumption, emissions, and increased costs due to independent operation and monitoring, and are prone to user errors.
Innovation Solution
A system utilizing a generator connected to a semi-truck's power takeoff (PTO) to generate AC power, converted to DC power, which is stored in batteries and used to operate a refrigeration system independently of the truck engine, with optional solar or 220V power inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a dedicated diesel engine is used to power the refrigeration unit, then the refrigeration unit can operate independently, but maintenance requirements and fuel consumption increase
Solution Approach 1:
The patent extracts the refrigeration load from the dedicated diesel engine and transfers it to the semi-truck's existing powertrain system. The refrigeration unit is powered through the truck's alternator and electrical system, eliminating the need for a separate diesel engine while maintaining independent operation capability. This resolves the contradiction by removing the complex maintenance requirements of a dedicated engine while preserving the ability to operate independently.
Solution Approach 2:
The patent makes the semi-truck's electrical system serve multiple functions: powering the truck's accessories and powering the refrigeration unit. By utilizing the existing alternator, battery, and electrical infrastructure for dual purposes, the system eliminates the dedicated diesel engine while maintaining refrigeration independence. This multi-functionality approach resolves the contradiction between independent operation and maintenance complexity.
2Adaptability or versatility
If a dedicated diesel engine is used to power the refrigeration unit, then the refrigeration unit can operate independently, but fuel consumption and emissions increase
Solution Approach 1:
The patent extracts the refrigeration power requirement from the dedicated diesel engine system and integrates it into the semi-truck's existing electrical powertrain. By using the alternator and battery system instead of a separate diesel engine, the system eliminates additional fuel consumption and emissions while maintaining the ability to operate independently. This resolves the contradiction between independent operation and fuel efficiency.
3Adaptability or versatility
If a dedicated diesel engine is used to power the refrigeration unit, then the refrigeration unit can operate independently, but monitoring and refueling requirements increase
Solution Approach 1:
The patent integrates the refrigeration unit into the semi-truck's existing electrical system, which is already monitored for fuel levels and operational status. By sharing the power infrastructure, the system eliminates the need for separate monitoring of a dedicated diesel engine's fuel reservoir. The truck's existing monitoring systems now cover both the truck operations and refrigeration unit, simplifying operational oversight while maintaining independent refrigeration capability.
4Adaptability or versatility
If a dedicated diesel engine is used to power the refrigeration unit, then the refrigeration unit can operate independently, but user errors and breakdowns increase
Solution Approach 1:
The patent extracts the refrigeration unit from the complex mechanical system of a dedicated diesel engine and connects it to the simpler electrical system of the semi-truck. This eliminates multiple potential failure points including engine breakdowns, maintenance-related issues, and user errors associated with operating a separate diesel engine. The electrical system requires less maintenance and has fewer failure modes, thereby improving reliability while preserving independent operation capability.
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
Eliminates the need for a separate diesel engine, reducing maintenance, fuel consumption, emissions, and costs, while allowing independent operation of refrigeration units without diesel fuel monitoring.
Implementation Method 1
a generator that is configured to be mechanically connected to a power takeoff (PTO)
Implementation Method 2
a converter that is configured to receive AC power from the generator and is operable to convert the AC power to DC power
Implementation Method 3
The energy storage element is, in some implementations, connected to a controller configured to receive DC power provided by the converter
Data Source
AI summary
A system for PTO-driven refrigeration includes a generator that is configured to be mechanically connected to a power takeoff (PTO) and a converter that is configured to receive AC power from the generator and is operable to convert the AC power to DC power. The generator is connected to a charge controller that is connected to an energy storage element. The energy storage element is connected to a controller configured to receive DC power and provide AC power to a motor. The motor may be mechanically connectable to a refrigeration system. The energy storage element is further configured to receive power from a second charge controller that receives power via an AC power input or solar system. In some examples, the energy storage element provides power to auxiliary systems within a cab of a semi-truck.