Fuel cell-type industrial vehicle
US-2020083547-A1 · Mar 12, 2020 · US
Industrial vehicle
US11142441B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11142441-B2 |
| Application number | US-201916677770-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 8, 2019 |
| Priority date | Nov 12, 2018 |
| Publication date | Oct 12, 2021 |
| Grant date | Oct 12, 2021 |
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- Title
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- Abstract
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- Assignees and inventors
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- First independent claim
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- CPC / IPC classifications
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- Citations and related patents
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Abstract
Official abstract text for this publication.
A forklift includes a fuel cell system. The fuel cell system includes a battery stack and a capacitor and is electrically connected to a vehicle system. The vehicle system includes a control valve that switches supply of hydraulic oil to a power steering cylinder and a cargo-handling cylinder, a cargo-handling pump that supplies hydraulic oil stored in a hydraulic oil tank to the control valve, a cargo-handling motor that drives the cargo-handling pump, and an on-load valve that returns the hydraulic oil from the control valve to the hydraulic oil tank. The fuel cell system operates the fuel cell system to execute a warm-up control. A vehicle ECU continues supplying power from the fuel cell stack to the cargo-handling motor during the execution of the warm-up control.
First claim
Opening claim text (preview).
What is claimed is: 1. An industrial vehicle comprising a fuel cell system, wherein the fuel cell system is electrically connected to a vehicle system, the fuel cell system includes a fuel cell stack, and a capacitor that is electrically connected to the fuel cell stack, the vehicle system includes a plurality of valves including a control valve, a power steering valve, and a priority valve that switch a supply of hydraulic oil to supply destinations including at least one of a power steering cylinder or a cargo-handling cylinder, a cargo-handling pump that supplies hydraulic oil stored in a hydraulic oil tank to the control valve, a cargo-handling motor that drives the cargo-handling pump, a returning device configured to return the hydraulic oil from the control valve to the hydraulic oil tank when supply of the hydraulic oil from the control valve to the supply destinations is stopped, and a controller configured to control operation of the cargo-handling motor, the controller is configured to execute a warm-up control to warm up the fuel cell system by operating the fuel cell stack, and continue supplying power from the fuel cell stack to the cargo-handling motor during execution of the warm-up control. 2. An industrial vehicle comprising a fuel cell system, wherein the fuel cell system is electrically connected to a vehicle system, the fuel cell system includes a fuel cell stack, and a capacitor that is electrically connected to the fuel cell stack, the vehicle system includes a control valve that switches supply of hydraulic oil to supply destinations including at least one of a power steering cylinder or a cargo-handling cylinder, a cargo-handling pump that supplies hydraulic oil stored in a hydraulic oil tank to the control valve, a cargo-handling motor that drives the cargo-handling pump, a returning device configured to return the hydraulic oil from the control valve to the hydraulic oil tank when supply of the hydraulic oil from the control valve to the supply destinations is stopped, and a controller configured to control operation of the cargo-handling motor, the controller is configured to execute a warm-up control to warm up the fuel cell system by operating the fuel cell stack, continue supplying power from the fuel cell stack to the cargo-handling motor during execution of the warm-up control, execute the warm-up control by operating the fuel cell stack such that a power generated by the fuel cell stack becomes a constant value, and operate the cargo-handling motor such that a rotation speed of the cargo-handling motor gradually increases during the execution of the warm-up control. 3. An industrial vehicle comprising a fuel cell system, wherein the fuel cell system is electrically connected to a vehicle system, the fuel cell system includes a fuel cell stack, and a capacitor that is electrically connected to the fuel cell stack, the vehicle system includes a control valve that switches supply of hydraulic oil to supply destinations including at least one of a power steering cylinder or a cargo-handling cylinder, a cargo-handling pump that supplies hydraulic oil stored in a hydraulic oil tank to the control valve, a cargo-handling motor that drives the cargo-handling pump, a returning device configure to return the hydraulic oil from the control valve to the hydraulic oil tank when supply of the hydraulic oil from the control valve to the supply destinations is stopped, and a controller configured to control operation of the cargo-handling motor, the controller is configured to execute a warm-up control to warm up the fuel cell system by operating the fuel cell stack, continue supplying power from the fuel cell stack to the cargo-handling motor during execution of the warm-up control, execute the warm-up control by operating the fuel cell stack at a constant voltage no lower than a voltage of the capacitor, and during the execution of the warm-up control, operate the cargo-handling motor at a rotation speed that allows the cargo-handling motor to consume an amount of power supplied by the fuel cell stack, and the fuel cell stack and the capacitor are connected to each other via a DC/DC converter.
Assignees
Inventors
Classifications
- B66F9/22Primary
Hydraulic devices or systems · CPC title
Electric energy management in electromobility · CPC title
using power supplied by fuel cells (in combination with batteries B60L50/75) · CPC title
- B66F9/07572Primary
Propulsion arrangements · CPC title
Plug-in electric vehicles · CPC title
Patent family
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Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US11142441B2 cover?
- A forklift includes a fuel cell system. The fuel cell system includes a battery stack and a capacitor and is electrically connected to a vehicle system. The vehicle system includes a control valve that switches supply of hydraulic oil to a power steering cylinder and a cargo-handling cylinder, a cargo-handling pump that supplies hydraulic oil stored in a hydraulic oil tank to the control valve,…
- Who is the assignee on this patent?
- Toyota Jidoshokki Kk, Toyota Motor Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification B66F9/22. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Oct 12 2021 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 5 related publications on this page (citations in our corpus or others sharing the same primary CPC).