Method for determining engine control parameters based on requested engine braking torque
阅读说明:本技术 一种基于请求的发动机制动转矩确定发动机控制参数的方法 (Method for determining engine control parameters based on requested engine braking torque ) 是由 唐志国 于 2018-06-22 设计创作,主要内容包括:一种基于请求的发动机制动转矩确定发动机控制参数的方法,至少部分地基于所请求的发动机制动转矩来确定表示发动机损失的值;将代表发动机损失的值与所请求的发动机胸罩相结合;KE扭矩以确定期望的发动机燃烧转矩;基于至少一个发动机运行参数的期望值来修改期望的发动机燃烧转矩;基于至少一个发动机参数确定至少一个发动机控制参数以控制传递到至少一个气缸的空气质量;发动机燃烧扭矩。(A method of determining an engine control parameter based on a requested engine retarding torque, determining a value indicative of engine losses based at least in part on the requested engine retarding torque; associating a value representative of engine loss with the requested engine bra; KE torque to determine a desired engine combustion torque; modifying the desired engine combustion torque based on the desired value of the at least one engine operating parameter; determining at least one engine control parameter based on the at least one engine parameter to control the mass of air delivered to the at least one cylinder; engine combustion torque.)
1. A method of determining an engine control parameter based on a requested engine retarding torque, characterized by: determining a value indicative of engine loss based at least in part on the requested engine braking torque; associating a value representative of engine loss with the requested engine bra; KE torque to determine a desired engine combustion torque; modifying the desired engine combustion torque based on the desired value of the at least one engine operating parameter; determining at least one engine control parameter based on the at least one engine parameter to control the mass of air delivered to the at least one cylinder; engine combustion torque.
2. The method of determining an engine control parameter based on requested engine retarding torque according to claim 1, wherein: wherein the step of determining a value representative of engine losses comprises determining a value representative of engine pumping losses for the desired engine load and engine friction losses based on the current engine speed.
3. The method of determining an engine control parameter based on requested engine retarding torque according to claim 1, wherein: wherein the step of modifying the desired engine combustion torque based on the air/fuel ratio comprises modifying the desired engine combustion torque based on a ratio of the desired air/fuel ratio to a stoichiometric air/fuel ratio.
4. The method of determining an engine control parameter based on requested engine retarding torque according to claim 1, wherein: wherein the step of modifying the desired engine combustion torque based on the desired firing angle comprises modifying the desired engine combustion torque based on the firing angle determined for the desired firing angle relative to the desired maximum braking torque.
5. The method of determining an engine control parameter based on requested engine retarding torque according to claim 1, wherein: wherein the single function comprises a look-up table referenced by a first variable representing a difference between a desired braking angle and an ignition angle of a maximum braking torque, and a second variable representing a ratio of a desired air/fuel ratio to stoichiometry a. The infrared/fuel ratio.
6. The method of determining an engine control parameter based on requested engine retarding torque according to claim 1, wherein: wherein the step of determining at least one engine control parameter further comprises determining a desired fuel mass based on the desired airflow and the desired air/fuel ratio.
Technical Field
The present disclosure relates to a system and method for determining engine control parameters, such as airflow and/or fuel flow based on engine torque.
Background
Electronic throttle control systems, such as variable cam timing systems and electronic throttle control systems, replace conventional mechanical throttle cable systems, which are "electronically linked" by sensors and actuators in communication with an electronic controller. This increases the control authority of the electronic controller and allows the air flow and/or fuel flow to be controlled independently of the accelerator pedal position. In order to control the actual output engine brake torque to achieve the driver demanded engine brake torque, it is necessary to determine appropriate values for the respective engine control parameters, such as air flow and fuel flow. Preferably, the calculation takes into account changes in engine operating parameters, such as engine operating temperature and accessory losses. While the prior art approach is acceptable for many applications and operating conditions, it is desirable to provide a more robust engine torque controller that improves the performance of the powertrain for the current application and is more adaptable to the new engine technology and control strategy SU. CH is used as direct injection, lean burn, variable cam timing, and variable displacement applications.
Disclosure of Invention
It is an object of the present invention to overcome the above-mentioned deficiencies of the prior art by providing a method of determining an engine control parameter based on a requested engine retarding torque, a system and method for determining at least one engine control parameter based on a requested engine retarding torque that has been compensated or modified to take into account current engine operating parameters and/or control modes.
The technical scheme of the invention is as follows: determining a value indicative of engine loss based at least in part on the requested engine braking torque; associating a value representative of engine loss with the requested engine bra; KE torque to determine a desired engine combustion torque; modifying the desired engine combustion torque based on the desired value of the at least one engine operating parameter; determining at least one engine control parameter based on the at least one engine parameter to control the mass of air delivered to the at least one cylinder; engine combustion torque.
Wherein the step of determining a value representative of engine losses comprises determining a value representative of engine pumping losses for the desired engine load and engine friction losses based on the current engine speed.
Wherein the step of modifying the desired engine combustion torque based on the air/fuel ratio comprises modifying the desired engine combustion torque based on a ratio of the desired air/fuel ratio to a stoichiometric air/fuel ratio.
Wherein the step of modifying the desired engine combustion torque based on the desired firing angle comprises modifying the desired engine combustion torque based on the firing angle determined for the desired firing angle relative to the desired maximum braking torque.
Wherein the single function comprises a look-up table referenced by a first variable representing a difference between a desired braking angle and an ignition angle of a maximum braking torque, and a second variable representing a ratio of a desired air/fuel ratio to stoichiometry a. The infrared/fuel ratio.
Wherein the step of determining at least one engine control parameter further comprises determining a desired fuel mass based on the desired airflow and the desired air/fuel ratio.
The invention has the beneficial effects that: a system and method for engine torque control is provided that is capable of simultaneously determining a desired airflow and fuel flow to produce a desired engine torque, which is a function of engine operating parameters.
Drawings
FIG. 1 is a block diagram of a system and method of determining engine control parameters based on requested engine torque according to the present invention.
Detailed Description
In fig. 1, a
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