Method and control device for determining a gas consumption of a gas-powered engine

• US 10,393,562 B2
• Filed: 04/20/2016
• Issued: 08/27/2019
• Est. Priority Date: 04/21/2015
• Status: Active Grant

• Current Assignee: MAN Energy Solutions SE (Volkswagen AG)
• Original Assignee: MAN Energy Solutions SE (Volkswagen AG)
• Inventors: Peters, Stefan, Heider, Gunter, Kremser, Thomas
• Primary Examiner(s): Eyassu, Marrit
• Application Number:
  US15/134,111
• Publication Number:
  US 20160313163A1
• Time in Patent Office: 1,224 Days
• Field of Search: 7311452
• CPC Class Codes: F02D 19/028 by estimation, i.e. without using direct measured parameter of a corresponding sensor
• CPC Class Codes: F02D 19/029 Determining density, viscosity, concentration or composition
• CPC Class Codes: F02D 19/0628 Determining the fuel pressure, temperature or flow, the fuel tank fill level or a valve position
• CPC Class Codes: F02D 2200/0406 Intake manifold pressure
• CPC Class Codes: F02D 2200/0414 Air temperature
• CPC Class Codes: F02D 2200/0611 Fuel type, fuel composition or fuel quality
• CPC Class Codes: F02D 2200/0625 Fuel consumption, e.g. measured in fuel liters per 100 kms or miles per gallon
• CPC Class Codes: F02D 2200/703 Atmospheric pressure
• CPC Class Codes: F02D 41/0027 the fuel being gaseous non-electrical control F02D19/02
• CPC Class Codes: G01F 9/001 with electric, electro-mechanic or electronic means G01F9/008 and G01F9/02 take precedence
• CPC Class Codes: Y02T 10/30 Use of alternative fuels, e.g. biofuels

Abstract

A method for determining a gas consumption of a gas-powered gas engine or a gas-powered dual-fuel engine. The engine is operated under actual operating conditions, and the actual gas consumption of the engine is acquired under the actual operating conditions. A target gas consumption of the engine to be anticipated under target operating conditions is calculated depending on the actual gas consumption and depending on discrepancies between the actual operating conditions and the target operating conditions.

Claims

1. A method for determining a gas consumption of a gas-powered engine, comprising:

operating the gas-powered engine under actual operating conditions;

acquiring an actual gas consumption of the gas-powered engine under the actual operating conditions;

calculating a target gas consumption anticipated under target operating conditions depending on the actual gas consumption and discrepancies between the actual operating conditions and the target operating conditions;

compensating the actual operating conditions based at least in part on the calculation; and

operating the gas-powered engine under the compensated actual operating conditions,

wherein the calculation of the target gas consumption is carried out according to the following equations;

V_TARGET=V_ACTUAL*KR1*KR2*KR3*KR4*KR5*KR6*KR7*KR8

KR1=1+k1*(T_U-ACTUAL−

T_U-TARGET)

KR2=1−

k2*(p_U-ACTUAL−

p_U-TARGET)

KR3=1+k3*(p_AG-ACTUAL−

p_AG-TARGET)

KR4=1+k41*ML_ACTUAL<sup>−

K42</sup>*(p_LL-ACTUAL−

p_LL-TARGET)

KR5=1+k5*(MZ_ACTUAL−

MZ_TARGET)

KR6=1+k61*(ZZP_ACTUAL²−

ZZP_TARGET²)−

K62*(ZZP_ACTUAL−

ZZP_TARGET)

KR7=1−

k7*(T_LL-ACTUAL−

T_LL-TARGET)

KR8=1+k8*(H_U-ACTUAL−

H_U-TARGET),

wherein;

V_TARGET is one of the target gas consumption of the gas-powered engine and a reference gas consumption of the gas-powered engine,

V_ACTUAL is an actual gas consumption of the gas-powered engine,

T_U is an ambient air temperature,

p_U is an ambient air pressure,

P_AG is an exhaust gas backpressure,

p_LL is a charge pressure,

MZ is a methane number of the gas,

ZZP is an ignition timing of the gas-powered engine,

T_LL is a charge air temperature,

H_U is an ambient air humidity,

ML is an engine load, and

k1, k2, k3, k41, k42, k5, k61, k62, k7, k8 are engine-dependent constants.

2. The method according to claim 1, wherein the engine-dependent constants k1, k2, k3, k41, k42, k5, k61, k62, k7, k8 are based on a type of lambda control in the gas-powered engine.

3. The method according to claim 2, wherein with a lambda control via charge air discharge, k1, k2, k3 each equal 0, and k41, k42, k5, k61, k62, k7, k8 are each greater than 0 and less than 1.

4. The method according to claim 2, wherein with a lambda control via one of a wastegate and a variable turbine geometry, charge air discharge, k1, k2, k3, k41, k42, k5, k61, k62, k7, k8 are each greater than 0 and less than 1.

5. The method according to claim 1, wherein the gas-powered engine is one of a gas-powered gas engine and a gas-powered dual-fuel engine.

6. A control device of a gas-powered engine, having a processor and memory, the control device configured to:

operate the gas-powered engine under actual operating conditions;

acquire an actual gas consumption of the gas-powered engine under the actual operating conditions;

calculate a target gas consumption anticipated under target operating conditions depending on the actual gas consumption and discrepancies between the actual operating conditions and the target operating conditions;

compensating the actual operating conditions based at least in part on the calculation; and

operating the gas-powered engine under the compensated actual operating conditions,

wherein the calculation of the target gas consumption is carried out according to the following equations;

V_TARGET=V_ACTUAL*KR1*KR2*KR3*KR4*KR5*KR6*KR7*KR8

KR1=1+k1*(T_U-ACTUAL−

T_U-TARGET)

KR2=1−

k2*(p_U-ACTUAL−

p_U-TARGET)

KR3=1+k3*(p_AG-ACTUAL−

p_AG-TARGET)

KR4=1+k41*ML_ACTUAL<sup>−

K42</sup>*(p_LL-ACTUAL−

p_LL-TARGET)

KR5=1+k5*(MZ_ACTUAL−

MZ_TARGET)

KR6=1+k61*(ZZP_ACTUAL²−

ZZP_TARGET²)−

K62*(ZZP_ACTUAL−

ZZP_TARGET)

KR7=1−

k7*(T_LL-ACTUAL−

T_LL-TARGET)

KR8=1+k8*(H_U-ACTUAL−

H_U-TARGET),

wherein;

V_TARGET is one of the target gas consumption of the gas-powered engine and a reference gas consumption of the gas-powered engine,

V_ACTUAL is an actual gas consumption of the gas-powered engine,

T_U is an ambient air temperature,

p_U is an ambient air pressure,

P_AG is an exhaust gas backpressure,

p_LL is a charge pressure,

MZ is a methane number of the gas,

ZZP is an ignition timing of the gas-powered engine,

T_LL is a charge air temperature,

H_U is an ambient air humidity,

ML is an engine load, and

k1, k2, k3, k41, k42, k5, k61, k62, k7, k8 are engine-dependent constants.

7. The method according to claim 6, wherein the engine-dependent constants k1, k2, k3, k41, k42, k5, k61, k62, k7, k8 are based on a type of lambda control in the gas-powered engine.

8. The method according to claim 7, wherein with a lambda control via charge air discharge, k1, k2, k3 each equal 0, and k41, k42, k5, k61, k62, k7, k8 are each greater than 0 and less than 1.

9. The method according to claim 7, wherein with a lambda control via one of a wastegate and a variable turbine geometry, charge air discharge, k1, k2, k3, k41, k42, k5, k61, k62, k7, k8 are each greater than 0 and less than 1.

10. The method according to claim 6, wherein the gas-powered engine is one of a gas-powered gas engine and a gas-powered dual-fuel engine.