DEVICE FOR DETECTING SPEED OF A ROTATABLE ELEMENT, METHOD AND VEHICLE

• US 20170299467A1
• Filed: 10/07/2015
• Published: 10/19/2017
• Est. Priority Date: 10/23/2014
• Status: Abandoned Application

• Current Assignee: Scania CV AB (Volkswagen AG)
• Original Assignee: Scania CV AB (Volkswagen AG)
• Inventors: JOHANSSON, Bjrn, ZAMANI, Sebastian, WANSLIN, Peter
• Application Number:
  US15/515,644
• Publication Number:
  US 20170299467A1
• Time in Patent Office: Days
• CPC Class Codes: F02B 77/085 with sensors measuring combustion processes, e.g. knocking, pressure, ionization, combustion flame
• CPC Class Codes: F02D 35/028 by determining the combustion timing or phasing
• CPC Class Codes: F02D 41/009 using means for generating position or synchronisation signals
• CPC Class Codes: F02P 7/067 Electromagnetic pick-up devices , e.g. providing induced current in a coil
• CPC Class Codes: G01D 5/145 influenced by the relative movement between the Hall device and magnetic fields see G01R33/06
• CPC Class Codes: G01D 5/24461 by redundancy or plausibility
• CPC Class Codes: G01M 15/06 by monitoring positions of pistons or cranks
• CPC Class Codes: G01P 3/481 of pulse signals
• CPC Class Codes: G01P 3/487 delivered by rotating magnets
• CPC Class Codes: G01P 3/488 delivered by variable reluctance detectors

Abstract

A device for detecting and monitoring crank shaft rotary speed and position in a four stroke engine, wherein a first and a second sensor are arranged to sense passage of reference marks on a rotatable element or elements. The first sensor is a high precision sensor which is arranged to sense passage of reference marks on a crank shaft flywheel of the engine, and the second sensor is a low speed sensor which is arranged to sense passage of reference marks on the crank shaft flywheel or reference marks or a wheel being associated with a cam shaft of the engine. The invention also concerns a method and a vehicle.

Claims

1. A device for detecting and monitoring crank shaft rotary speed and position in a four stroke engine, said device comprising:

a first and a second sensor are arranged to sense passage of reference marks on a rotatable element or elements, wherein

the first sensor is a high precision sensor which is arranged to sense passage of reference marks on a crank shaft flywheel of the engine, and

the second sensor is a low speed sensor which is arranged to sense passage of reference marks on the crank shaft flywheel or reference marks or a wheel being associated with a cam shaft of the engine.

2. A device according to claim 1, wherein the first sensor is an inductive sensor.

3. A device according to claim 1, wherein the second sensor is a Hall effect sensor or a magnetoresitive sensor.

4. A device according to claim 1, wherein the first and second sensors are connected to a control unit which is arranged to emit signals to a fuel injection system.

5. A device according to claim 1, wherein

the first and second sensors are pre-installed on a carrier member with determined mutual separation, and

the carrier member together with the first and second sensors is installable as an integral unit at a chosen position in association with the flywheel.

6. A device according to claim 1, wherein the reference marks are recesses or protrusions.

7. A method for detecting and monitoring crank shaft position in a four stroke engine, wherein a first and a second sensor senses passage of reference marks on a rotatable element or elements, wherein

the first sensor being a high precision sensor senses passage of reference marks on a crank shaft flywheel of the engine, and

the second sensor being a low speed sensor senses passage of reference marks on the crank shaft flywheel or reference marks on a wheel being associated with a cam shaft of the engine.

8. A method according to claim 7, wherein reference marks on the wheel being connected to a camshaft for valve control are sensed by the second sensor.

9. A method according to claim 7, wherein reference marks on the flywheel are sensed also by the second sensor.

10. A method according to claim 7, wherein the first sensor senses reference marks inductively.

11. A method according to claim 7, wherein the second sensor senses reference marks through the Hall effect or through magnetoresitive effect.

12. A method according to claim 9, wherein signals from the first and second sensors are led to a control unit which emits signals to a fuel injection system for synchronized fuel injection.

13. A method according to claim 9, further comprising:

pre-installing the first and second sensors with determined mutual separation on a carrier member; and

installing the carrier member together with the first and second sensors as an integral unit at a chosen position in association with the flywheel.

14. A vehicle comprising a device for detecting and monitoring crank shaft rotary speed and position in a four stroke engine, said device comprising:

a first and a second sensor are arranged to sense passage of reference marks on a rotatable element or elements, wherein

the first sensor is a high precision sensor which is arranged to sense passage of reference marks on a crank shaft flywheel of the engine, and

the second sensor is a low speed sensor which is arranged to sense passage of reference marks on the crank shaft flywheel or reference marks or a wheel being associated with a cam shaft of the engine.

15. A vehicle according to claim 14, wherein the first sensor is an inductive sensor.

16. A vehicle according to claim 14, wherein the second sensor is a Hall effect sensor or a magnetoresitive sensor.

17. A vehicle according to claim 14, wherein the first and second sensors are connected to a control unit which is arranged to emit signals to a fuel injection system.

18. A vehicle according to claim 14, wherein

the first and second sensors are pre-installed on a carrier member with determined mutual separation, and

the carrier member together with the first and second sensors is installable as an integral unit at a chosen position in association with the flywheel.

19. A vehicle according to claim 14, wherein the reference marks are recesses or protrusions.