Drive device for fuel injection device
US-2020088122-A1 · Mar 19, 2020 · US
Fuel injection control device
US11118525B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11118525-B2 |
| Application number | US-202017065121-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 7, 2020 |
| Priority date | Oct 11, 2019 |
| Publication date | Sep 14, 2021 |
| Grant date | Sep 14, 2021 |
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- Title
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Abstract
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A fuel injection control device includes an injection valve drive circuit that drives a plurality of injection valves, a booster circuit that generates a boosted voltage supplied to the injection valve drive circuit; and a fuel pump drive circuit that drives a fuel pump for compressing fuel of an internal combustion engine. The fuel pump drive circuit is configured to, when driving the fuel pump, regenerate energy into the booster circuit. The injection valve drive circuit is configured to, during a non-drive period of the injection valves or during a period in which the fuel pump is intermittently driven continuously, perform a non-valve opening energization on at least one of the plurality of injection valves.
First claim
Opening claim text (preview).
The invention claimed is: 1. A fuel injection control device, comprising: an injection valve drive circuit that drives a plurality of injection valves; a booster circuit that generates a boosted voltage supplied to the injection valve drive circuit; and a fuel pump drive circuit that drives a fuel pump for compressing fuel of an internal combustion engine, wherein the fuel pump drive circuit is configured to, when driving the fuel pump, regenerate energy into the booster circuit, and the injection valve drive circuit is configured to, during a non-drive period of the injection valves or during a period in which the fuel pump is intermittently driven continuously, perform a non-valve opening energization on at least one of the plurality of injection valves. 2. The fuel injection device of claim 1 , further comprising: a boosted voltage monitor circuit that measures the boost voltage, wherein the injection valve drive circuit is configured to: start the non-valve opening energization when the boosted voltage measured by the boosted voltage monitor circuit reaches or exceeds a first threshold voltage, and stop the non-valve opening energization when the boosted voltage reaches or falls below a second threshold voltage, the second threshold voltage being lower than the first threshold voltage. 3. The fuel injection device of claim 2 , wherein the non-valve opening energization and the driving of the fuel pump are stopped when the boosted voltage measured by the boosted voltage monitor circuit falls below a third threshold voltage, the third threshold voltage being lower than the second threshold voltage and indicating an abnormality in the operation of the booster circuit. 4. The fuel injection device of claim 1 , wherein the injection valve drive circuit is configured to start the non-valve opening energization after detecting that the driving of the pump is completed based on a control signal from the fuel pump drive circuit to the fuel pump. 5. The fuel injection device of claim 1 , wherein the injection valve drive circuit is configured to perform the non-valve opening energization sequentially on all of the plurality of injection valves. 6. The fuel injection device of claim 1 , wherein the injection valve drive circuit is configured to stop the non-valve opening energization when a current supplied to at least one of the plurality of injection valves due to the non-valve opening energization reaches a predetermined value. 7. The fuel injection device of claim 1 , wherein the injection valve drive circuit is configured to stop the non-valve opening energization after a predetermined time has elapsed from the start of the non-valve opening energization.
Assignees
Inventors
Classifications
Fail safe control for fuel injection pump · CPC title
Electrically controlling a diesel injection pump (F02D41/401 takes precedence) · CPC title
using means for creating a boost voltage, i.e. generation or use of a voltage higher than the battery voltage, e.g. to speed up injector opening · CPC title
- F02D41/20Primary
Output circuits, e.g. for controlling currents in command coils · CPC title
with means for determining actual opening or closing time · CPC title
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Frequently asked questions
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- What does patent US11118525B2 cover?
- A fuel injection control device includes an injection valve drive circuit that drives a plurality of injection valves, a booster circuit that generates a boosted voltage supplied to the injection valve drive circuit; and a fuel pump drive circuit that drives a fuel pump for compressing fuel of an internal combustion engine. The fuel pump drive circuit is configured to, when driving the fuel pum…
- Who is the assignee on this patent?
- Denso Corp
- What technology area does this patent fall under?
- Primary CPC classification F02D41/20. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Sep 14 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 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).