Method and fluid pump for conveying a fluid in a fluid circuit of a motor vehicle
US-11421675-B2 · Aug 23, 2022 · US
Method for controlling the start-up of an oil pump
US11873808B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11873808-B2 |
| Application number | US-202017432309-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 28, 2020 |
| Priority date | Feb 21, 2019 |
| Publication date | Jan 16, 2024 |
| Grant date | Jan 16, 2024 |
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- Title
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Abstract
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A method controls the start-up of an oil pump of a gearbox by a brushless electric motor that has no position sensor. The stator coils are powered from the off mode in a constant-current open-loop control sequence until the pump reaches a speed threshold at which speed regulation switches over to closed-loop control on a setpoint corresponding to the lubrication flow rate required to ensure the reliability of the gearbox, but without in so doing exceeding a current threshold indicative of pump seizure, at which point motor control switches back over to the constant-current open-loop control sequence. The open-loop current setpoint is higher than the threshold for switching over to closed-loop control so that in the open-loop control mode the motor torque available at the pump is higher than in the closed-loop control mode.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method for controlling the start-up of a gearbox oil pump by a brushless electric motor, without position sensor, comprising: powering stator coils of the motor from an off mode according to a constant-current open-loop control sequence until the pump reaches a speed threshold at which a speed regulation switches over to closed-loop control on a setpoint corresponding to a lubrication flow rate necessary to ensure reliability of a gearbox, but without exceeding a current threshold detecting seizure of the pump at which motor control switches back over to a constant-current open-loop control sequence, wherein the open-loop current setpoint is higher than the threshold for switching over to closed-loop mode, so as to have, in open-loop mode, a motor torque on the pump that is higher than in the closed-loop mode, and wherein, upon detection of seizure of the pump in the closed-loop mode, a GMP computer switches over the pump speed regulation to the open-loop mode for a calibrated period. 2. The method for controlling the start-up of an oil pump as claimed in claim 1 , wherein the open-loop mode pump control sequence comprises a sequence of oscillations of a rotor of the motor. 3. The method for controlling the start-up of an oil pump as claimed in claim 1 , wherein, at the end of the calibrated period, the GMP computer sends a speed setpoint to the pump corresponding to operation of the closed-loop mode. 4. The method for controlling the start-up of an oil pump as claimed in claim 3 , wherein the GMP computer returns the open-loop control sequence each time the seizure detection threshold is exceeded in the closed-loop mode.
Assignees
Inventors
Classifications
- F04B49/02Primary
Stopping, starting, unloading or idling control · CPC title
driven by electric motors · CPC title
by changing the driving speed · CPC title
Control of lubricant levels, e.g. lubricant level control dependent on temperature · CPC title
Rotational speed of the axis · CPC title
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Frequently asked questions
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- What does patent US11873808B2 cover?
- A method controls the start-up of an oil pump of a gearbox by a brushless electric motor that has no position sensor. The stator coils are powered from the off mode in a constant-current open-loop control sequence until the pump reaches a speed threshold at which speed regulation switches over to closed-loop control on a setpoint corresponding to the lubrication flow rate required to ensure the…
- Who is the assignee on this patent?
- Renault Sas
- What technology area does this patent fall under?
- Primary CPC classification F04B49/02. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Jan 16 2024 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 6 related publications on this page (citations in our corpus or others sharing the same primary CPC).