# US 2017/0254307 A1 · Test procedure for high-pressure pumps > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0254307 A1 - Document ID: US20170254307A1 - Status: Published application - Kind: A1 - Application number: 15/506,846 - Filed: 2015-07-13 - Published: 2017-09-07 - Earliest claimed: 2014-09-01 - Assignees: Robert Bosch GmbH - Applicants: Robert Bosch GmbH - Inventors: Reinhard Hoss; Dirk Doerhoefer; Joachim Goeser; Karl-Martin Kutteruf; Markus Vogel; Martin Maier; Thilo Bareuther - Web page: https://patentgrep.com/patent/US20170254307A1 ## CPC - F02M 65/003: {Measuring variation of fuel pressure in high pressure line} - F02D 41/221: {relating to the failure of actuators or electrically driven elements} - F02M 59/44: Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; {Pumps having transducers, e.g. to measure displacement of pump rack or piston} - F02M 63/0052: {with means for adjusting the opening pressure, e.g. electrically controlled} - F02M 63/025: {from the common rail} - 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} - F04B 51/00: Testing machines, pumps, or pumping installations - F02D 41/3863: {by controlling the flow out of the common rail, e.g. using pressure relief valves} - F02D 2041/224: {Diagnosis of the fuel system} - F02D 2200/06: Fuel or fuel supply system parameters - F02M 55/007: {Venting means} - F02M 2200/02: Fuel-injection apparatus having means for reducing wear - Y02T 10/40: Engine management systems - F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF - 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) - F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A method for testing a high-pressure pump, particularly a high-pressure pump which is provided to inject fuel into a combustion engine, the method including filling the high-pressure pump with a fluid prior to switching it on. ## Claims ### Claim at position 1 1-10. (canceled) ### Claim 11 A method for testing a high-pressure pump, comprising: filling the high-pressure pump with a fluid prior to switching it on. ### Claim 12 (depends on 11) The method as recited in claim 11, wherein the high-pressure pump is designed to inject fuel into a combustion engine. ### Claim 13 (depends on 11) The method as recited in claim 11, further comprising: switching on the high-pressure pump only after at least one of a return-flow quantity and a delivery quantity has been measured at outputs of the high-pressure pump. ### Claim 14 (depends on 11) The method as recited in claim 11, further comprising: filling a high-pressure accumulator by way of the high-pressure pump; and restricting an outlet of the high-pressure accumulator prior to switching on the high-pressure pump. ### Claim 15 (depends on 14) The method as recited in claim 14, further comprising: prior to switching on the high-pressure pump, energizing a pressure regulating valve which is provided at an outlet of the high-pressure accumulator to already restrict the outlet of the high-pressure accumulator before the high-pressure pump is switched on. ### Claim 16 (depends on 14) The method as recited in claim 14, further comprising: measuring the pressure in the high-pressure accumulator, and activating a pressure control if the pressure in the high-pressure accumulator exceeds a preset limiting value. ### Claim 17 (depends on 14) The method as recited in claim 14, wherein the method includes that even upon a change of the test step, in case of a modification of the setpoint pressure, not to reduce the pressure in the high-pressure accumulator to below a predetermined minimum pressure. ### Claim 18 (depends on 17) The method as recited in claim 17, wherein the predetermined minimum pressure is a pressure of 200 bar. ### Claim 19 (depends on 11) The method as recited in claim 11, further comprising: activating a metering unit of the high-pressure pump with a frequency of 1 Hz to 10 Hz. ### Claim 20 (depends on 19) The method as recited in claim 19, wherein the frequency is 2 Hz. ### Claim 21 (depends on 16) The method as recited in claim 16, further comprising: activating a metering unit of the high-pressure pump with a frequency of 1 Hz to 10 Hz prior to the beginning of the test steps. ### Claim 22 (depends on 21) The method as recited in claim 21, wherein the frequency is 2 Hz. ### Claim 23 An apparatus for testing a high-pressure pump, comprising: a fluid reservoir designed to make a fluid available; a low-pressure pump designed to convey fluid from the fluid reservoir into a high-pressure pump to be tested; a high-pressure accumulator connected to a high-pressure output of the high-pressure pump; a pressure regulating valve designed to regulate pressure in the high-pressure accumulator; and a control device designed to control the low-pressure pump, the high-pressure pump to be tested and the pressure regulating valve, wherein the control device is designed to control the low-pressure pump, the high-pressure pump to be tested and the pressure regulating valve in such a way that the apparatus causes the high-pressure pump to fill with a fluid prior to switching it on. ### Claim 24 (depends on 23) The apparatus for testing a high-pressure pump as recited in claim 23, wherein the apparatus has at least of at least one flow sensor and pressure sensor which is designed to measure at least one of a flow rate and a pressure of fluid that has been delivered by the high-pressure pump, and to make the measuring result available to the control device.