# US 2018/0023720 A1 · Method for simulating extreme or defective solenoid valves for demonstrating the failure effect and for detecting faults in order to certify a vehicle diagnosis system

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- Number: US 2018/0023720 A1
- Document ID: US20180023720A1
- Status: Published application
- Kind: A1
- Application number: 15/548,297
- Filed: 2016-01-26
- Published: 2018-01-25
- Earliest claimed: 2015-02-26
- Assignees: Schaeffler Technologies AG & Co. KG
- Applicants: Schaeffler Technologies AG & Co. KG
- Inventors: Piergiacomo Traversa; Gerulf Pedersen
- Web page: https://patentgrep.com/patent/US20180023720A1

## CPC

- F16K 31/06: using a magnet {, e.g. diaphragm valves, cutting off by means of a liquid}
- F02B 77/082: {relating to valves}
- F02D 41/20: Output circuits, e.g. for controlling currents in command coils
- F02D 41/221: {relating to the failure of actuators or electrically driven elements}
- F02M 51/0621: {acting on one mobile armature (F02M51/0628 takes precedence)}
- F02M 65/00: Testing fuel-injection apparatus, e.g. testing injection timing {(testing of ignition F02P17/00; measuring fuel consumption G01F9/00); Cleaning of fuel-injection apparatus}
- F02D 2041/2017: {using means for creating a boost current or using reference switching}
- F02D 2041/2034: {Control of the current gradient}
- F02D 2041/2044: {using pre-magnetisation or post-magnetisation of the coils}
- F02D 2041/2055: {with means for determining actual opening or closing time}
- F02D 2041/2058: {using information of the actual current value}
- Y02T 10/40: Engine management systems
- F16K: VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING {(devices for emptying and evacuating the excess liquid in valves or conduits F16L55/07)}
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)
- F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W)
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

The invention relates to a method for simulating malfunctioning solenoid valves for an internal combustion engine by influencing an activation time and a deactivation time of the solenoid valve. A current with a specified modifiable current strength flows through the solenoid valve in order to achieve an opening and closing process. The closing process is forced after the current supplied to the solenoid valve is activated at the activation time, and the opening process is forced after the current supplied to the solenoid valve is deactivated at the deactivation time. The current is applied with a charging current strength prior to the activation time for the duration of a charging phase, and after the activation time, the current is increased to peak current strength and subsequently reduced to a holding current strength. Furthermore, after the deactivation time, the current strength is reduced to a deactivation current strength, and after a delay, the current strength (I) increases again as a result of induction. A variation of the value and/or duration of the current strength and/or an application of an additional magnetic force is used to simulate a premature activation, a delayed activation, a premature deactivation, and/or a delayed deactivation.

## Claims

### Claim 1

A method for simulating malfunctioning solenoid valves for an internal combustion engine by influencing an activation time and a deactivation time of the solenoid valve, the method comprising: energizing the solenoid valve with current of a predetermined, variable current strength for realizing opening and closing processes, forcing the closing process after activation of a current feed to the solenoid valve at an activation point in time, and forcing the opening process after a deactivation of the current feed to the solenoid valve at a deactivation point in time, before the activation point in time applying the current with a charging current strength for a duration of a charging phase and starting from the activation point in time increasing the current to a peak current strength and then reducing the current to a holding current strength, and starting from the deactivation point in time further reducing the current strength to a deactivation current strength, wherein after a time offset the current strength (I) increases again due to inductance, and using at least one of a variation of a magnitude, a duration of the current strength, or application of an additional magnetic force for simulating at least one of an advanced activation, a retarded activation, an advanced deactivation, or a retarded deactivation.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the additional magnetic force is provided by a permanent magnet or an additional coil that carries an electric current.

### Claim 3 (depends on 2)

The method according to claim 2, wherein the permanent magnet connects axially to an element of the solenoid valve to be moved or the additional coil surrounds a primary coil provided for shifting the element to be moved.

### Claim 4 (depends on 2)

The method according to claim 2, wherein the permanent magnet is mounted on a housing of the solenoid valve.

### Claim 5 (depends on 1)

The method according to claim 1, wherein for simulating the advanced activation, at least one of the peak current strength is increased, the charging current strength is increased, or the charging phase is lengthened.

### Claim 6 (depends on 1)

The method according to claim 1, wherein for simulating the retarded activation, at least one of the peak current strength is reduced, the charging current strength is reduced, or the charging phase is shortened.

### Claim 7 (depends on 1)

The method according to claim 1, wherein for simulating the advanced deactivation, a magnetic field generated by the additional magnetic force has an opposite polarity than a magnetic field generated by a primary coil.

### Claim 8 (depends on 1)

The method according to claim 1, wherein for simulating the retarded deactivation, at least one of the holding current strength is increased or a time offset between the deactivation point in time and an inductively caused increase of the current strength is shortened.

### Claim 9 (depends on 2)

The method according to claim 2, wherein for simulating the advanced activation and for simulating the retarded deactivation, the permanent magnet is applied so that a magnetic field generated thereby has a same polarity as a magnetic field generated by a primary coil or for simulating the retarded activation and for simulating the advanced deactivation, the permanent magnet is applied so that the magnetic field generated thereby has an opposite polarity as the magnetic field generated by the primary coil.

### Claim 10 (depends on 2)

The method according to claim 2, wherein for simulating the advanced activation and for simulating the retarded deactivation, a magnetic field generated by the additional coil has a same polarity as a magnetic field generated by a primary coil or for simulating the retarded activation and for simulating the advanced deactivation, the magnetic field generated by the additional coil has an opposite polarity as the magnetic field generated by the primary coil.