Engine graded starting and load linkage protection system based on double-temperature threshold control

Abstract

The invention discloses an engine staged starting and load linkage protection system based on double temperature threshold control, and the system comprises a double temperature sensing module which comprises an engine oil temperature sensor and a water temperature sensor and is used for providing more credible data and avoiding the misjudgment risk of a single sensor; and the controller is electrically connected with the double-temperature sensing module, is electrically connected with an engine through an integrated CAN bus communication module, and is used for receiving return data of the double-temperature sensing module and controlling the engine. According to the method, misjudgment caused by only obtaining a single temperature parameter can be avoided, the phenomenon of false allowed starting of the engine is prevented, and the engine is controlled to start and heat at reasonable time.

Description

Technical Field

[0001] The present invention relates to the technical field of engine intelligent control, and in particular to an engine staged starting and load linkage protection system based on dual temperature threshold control. Background Art

[0002] In the field of engine intelligent control technology, when an existing engine is started, its engine control system relies on a single temperature parameter (such as coolant temperature) to determine the starting conditions. If the sensor ages, it will cause the engine to be forced to start even when the oil fluidity is insufficient in a low-temperature environment, exacerbating the wear of the piston ring and cylinder liner.

[0003] Secondly, in the low temperature environment of the plateau, the engine is prone to the phenomenon of "false start-up", resulting in abnormal start-up.

[0004] Third, the existing engine load access control is disconnected from the hot engine state. Some systems only judge the load timing based on the running time, and do not formulate specific starting conditions according to the specific situation. The engine is not truly warmed up, resulting in an increase in the knock rate when loading at low temperatures.

[0005] The information disclosed in this background technology section is only intended to enhance understanding of the overall background of the invention and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the Invention

[0006] The purpose of the present invention is to provide an engine staged start and load linkage protection system based on dual temperature threshold control, which can solve the problems existing in the background technology.

[0007] To achieve the above objectives, the present invention provides an engine staged start and load linkage protection system based on dual temperature threshold control, comprising: a dual temperature sensing module, including an oil temperature sensor and a water temperature sensor, for providing more reliable data and avoiding the risk of misjudgment by a single sensor; a controller, the controller being electrically connected to the dual temperature sensing module, the controller being electrically connected to the engine via an integrated CAN bus communication module, for receiving the return data from the dual temperature sensing module and controlling the engine.

[0008] In one or more embodiments, the dual temperature sensing module further includes: the oil temperature sensor adopts a PT1000 platinum resistor with a range of -40°C to 150°C and an accuracy of ±1°C, the oil temperature sensor is installed at the bottom of the engine oil pan, and the output end of the oil temperature sensor is connected to the AIN1 pin of the controller; the water temperature sensor adopts a PT1000 platinum resistor with a range of -40°C to 150°C and an accuracy of ±1°C, the water temperature sensor is installed at the cylinder water jacket outlet, and the output end of the water temperature sensor is connected to the AIN2 pin of the controller.

[0009] In one or more embodiments, the controller includes: an AIN1 channel for receiving an oil signal; an AIN2 channel for receiving a water temperature signal; a PWM input for receiving a crankshaft speed signal; and a DO3 relay for controlling ACB closing. The PWM input uses a Hall sensor with a resolution of 0.1 rpm.

[0010] In the second aspect, the present invention provides an engine staged start and load linkage protection method based on dual temperature threshold control, based on the engine staged start and load linkage protection system based on dual temperature threshold control, including: S1: obtaining Toil and Twater data, wherein the Toil is the data returned by the oil temperature sensor, and the Twater is the data returned by the water temperature sensor; S2: performing a first-level start unlocking judgment on the Toil and Twater data; S3: performing a second-level load interlocking judgment on the Toil and Twater data.

[0011] In one or more embodiments, the step S2 includes: S21: obtaining a preset start unlocking temperature T1; S22: comparing Toil, Twater and T1, and if Toil≥T1 and Twater≥T1, generating an engine ignition command; S23: when the engine ignition command is generated, the controller supplies power to the starter motor.

[0012] In one or more embodiments, step S3 includes: S31: obtaining a preset load interlock temperature T2; S32: comparing Toil, Twater and T2, and generating a load access instruction if Toil≥T2 and Twater≥T2; S33: when the load access instruction is generated, the controller sends a closing instruction to the DO3 relay and allows the load to be connected.

[0013] In one or more embodiments, T1 and / or T2 are determined by the following formula: T=Tadjusted=Tbase+K×H; wherein T is the compensation coefficient of T1 and / or T2, and its value range is 0.0025-0.0035℃ / m, with a preferred value of 0.003℃ / m, and H is the altitude, in meters.

[0014] In one or more embodiments, a sensor fault tolerance solution is further included: when any temperature sensor fails, the system automatically switches to single sensor mode, the T1 value increases by 10° C., and a degraded operation alarm is triggered.

[0015] Compared with the prior art, the multiple technical solutions and embodiments provided by the present invention have at least the following technical effects or advantages:

[0016] By setting up a dual temperature sensor module, the system can avoid misjudging the start caused by errors in a single temperature measurement, thereby reducing the risk of knock; the engine can be started through a two-level judgment to avoid false start permission caused by a single judgment error; in the single sensor mode, the start threshold is increased when any temperature sensor fails. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and can be considered as illustrative of various combinations of preferred embodiments and do not constitute an undue limitation of the present invention. In the drawings:

[0018] Figure 1 This is a system architecture diagram of an engine staged start and load linkage protection system based on dual temperature threshold control provided by the present invention;

[0019] Figure 2 A hierarchical control logic flow chart of an engine hierarchical start-up and load linkage protection system based on dual temperature threshold control provided by the present invention;

[0020] The numbers in the figure represent: 11-oil temperature sensor, 12-water temperature sensor, 2-controller, 21-DO3 relay, 22-PWM input. DETAILED DESCRIPTION

[0021] Unless otherwise expressly stated, throughout the specification and claims, the term "comprise" or its variations such as "include" or "comprising", "made of", etc. will be understood to include the stated elements or components but not to exclude other elements or other components.

[0022] The purpose of the present invention is to provide an engine graded start and load linkage protection system based on dual temperature threshold control, so as to avoid misjudgment of a single temperature parameter, prevent the engine from having a "false start permission" phenomenon, and control the engine to start the hot engine at a reasonable time.

[0023] Example 1:

[0024] This embodiment provides an engine staged start and load linkage protection system based on dual temperature threshold control, including: a dual temperature sensing module, including an oil temperature sensor 11 and a water temperature sensor 12, for providing more reliable data and avoiding the risk of misjudgment by a single sensor; a controller 2, the controller 2 is electrically connected to the dual temperature sensing module, the controller 2 is electrically connected to the engine through an integrated CAN bus communication module, and is used to receive the return data from the dual temperature sensing module and control the engine.

[0025] Specifically, in order to avoid misjudgment of a single temperature parameter, prevent the engine from experiencing the phenomenon of "false permission to start", and control the engine to start the heat engine at a reasonable time, this application sets a dual temperature sensing module to avoid the situation where a single sensor failure causes the system to misjudgment of the start conditions. The dual sensors detect the oil temperature and water temperature to determine whether the engine has met the start conditions from multiple angles, making the determination of engine start more accurate; when in low temperature conditions on the plateau, the existing engine heat engine does not take into account the air pressure and temperature factors, while this embodiment takes into account the plateau conditions to avoid abnormal start-up. The controller 2 controls the timing of engine start-up by judging the data from the dual temperature sensing module.

[0026] As a preferred implementation manner of this embodiment, the dual temperature sensing module further includes: the oil temperature sensor 11 adopts a PT1000 platinum resistor, whose range is -40°C to 150°C and the accuracy is ±1°C, the oil temperature sensor 11 is installed at the bottom of the engine oil pan, and the output end of the oil temperature sensor 11 is connected to the AIN1 pin of the controller 2; the water temperature sensor 12 adopts a PT1000 platinum resistor, whose range is -40°C to 150°C and the accuracy is ±1°C, the water temperature sensor 12 is installed at the cylinder water jacket outlet, and the output end of the water temperature sensor 12 is connected to the AIN2 pin of the controller 2.

[0027] Specifically, the dual temperature sensing module needs to be accurate, and the error between the oil temperature sensor 11 and the water temperature sensor 12 should be within ±1° C. to avoid misjudgment due to sensor error.

[0028] As a preferred implementation of this embodiment, the controller 2 includes: an AIN1 channel for receiving an oil signal; an AIN2 channel for receiving a water temperature signal; a PWM input 22 for receiving a crankshaft speed signal; and a DO3 relay 21 for controlling ACB closing. The PWM input 22 uses a Hall sensor with a resolution of 0.1 rpm.

[0029] Specifically, the controller 2 obtains more comprehensive engine starting condition information through multiple receiving sensor signal interfaces.

[0030] Example 2:

[0031] This embodiment provides an engine staged start and load linkage protection method based on dual temperature threshold control. Based on the same concept, this embodiment is used to implement an engine staged start and load linkage protection system based on dual temperature threshold control as described in Example 1, including: S1: obtaining Toil and Twater data, wherein the Toil is the data returned by the oil temperature sensor 11, and the Twater is the data returned by the water temperature sensor 12; S2: performing a first-level start unlocking judgment on the Toil and Twater data; S3: performing a second-level load interlocking judgment on the Toil and Twater data.

[0032] Specifically, in order to avoid detonation caused by misjudgment of engine start time, this embodiment performs two-level judgment, which is equivalent to putting two locks on the engine start. Both levels of judgment must be passed before the engine can be started, avoiding the phenomenon of false permission to start the engine and providing multiple guarantees for engine start safety. Among them, the first level judgment is the start unlock judgment, and the second level judgment is the load interlock judgment, avoiding the risk of single sensor misjudgment and preventing damage under low temperature load.

[0033] As a preferred implementation of this embodiment, the step S2 includes: S21: obtaining a preset start unlocking temperature T1; S22: comparing Toil, Twater and T1, and if Toil≥T1 and Twater≥T1, generating an engine ignition command; S23: when the engine ignition command is generated, the controller 2 supplies power to the starter motor.

[0034] Specifically, in order to provide suitable starting conditions, this embodiment inputs the T1 parameter into the system, and determines whether the engine has reached the appropriate ignition point by comparing the T1 parameter with the temperature returned by the sensor. When the water temperature and oil temperature both exceed the T1 parameter, the system determines to generate an engine ignition command and supplies power for ignition.

[0035] As a preferred implementation of this embodiment, step S3 includes: S31: obtaining a preset load interlock temperature T2; S32: comparing Toil, Twater and T2, and if Toil≥T2 and Twater≥T2, generating a load access instruction; S33: when the load access instruction is generated, the controller 2 sends a closing instruction to the DO3 relay 21 and allows the load to be connected.

[0036] Specifically, the second-level judgment includes inputting the T2 parameter into the system. After receiving the T2 parameter, the system compares Toil, Twater and T2 again. When the conditions are met, the system allows the load to be connected, and sends a closing command to the DO3 relay 21 and closes the ACB.

[0037] As a preferred implementation manner of this embodiment, T1 and / or T2 are determined by the following formula: T=Tadjusted=Tbase+K×H; wherein T is the compensation coefficient of T1 and / or T2, and its value range is 0.0025-0.0035℃ / m, with a preferred value of 0.003℃ / m, and H is the altitude, in meters.

[0038] As a preferred implementation of this embodiment, a sensor fault tolerance solution is also included: when any temperature sensor fails, the system automatically switches to single sensor mode, the T1 value increases by 10° C., and a degraded operation alarm is triggered.

[0039] Specifically, to prevent sensor failure from causing errors in the system's determination of ignition start, when data from one sensor is missing, this embodiment provides a single-sensor mode, increases the ignition threshold, and provides a degraded operation alarm.

[0040] The foregoing descriptions of specific exemplary embodiments of the present invention are for purposes of illustration and description. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is apparent that many variations and modifications are possible in light of the foregoing teachings. The exemplary embodiments have been selected and described for the purpose of explaining the specific principles of the invention and their practical application, thereby enabling those skilled in the art to realize and utilize a variety of exemplary embodiments of the invention and various options and modifications. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. An engine staged start and load linkage protection system based on dual temperature threshold control, characterized in that: include: Dual temperature sensing module, including oil temperature sensor and water temperature sensor, is used to provide more reliable data and avoid the risk of misjudgment by a single sensor; A controller is electrically connected to the dual temperature sensing module. The controller is electrically connected to the engine via an integrated CAN bus communication module, and is used to receive the return data from the dual temperature sensing module and control the engine.

2. The engine staged start and load linkage protection system based on dual temperature threshold control according to claim 1 is characterized in that: The dual temperature sensing module further includes: The oil temperature sensor uses a PT1000 platinum resistor with a range of -40°C to 150°C and an accuracy of ±1°C. The oil temperature sensor is installed at the bottom of the engine oil pan, and the output end of the oil temperature sensor is connected to the AIN1 pin of the controller; The water temperature sensor uses a PT1000 platinum resistor with a range of -40°C to 150°C and an accuracy of ±1°C. The water temperature sensor is installed at the outlet of the cylinder water jacket, and the output end of the water temperature sensor is connected to the AIN2 pin of the controller.

3. The engine staged start and load linkage protection system based on dual temperature threshold control according to claim 1, characterized in that: The controller includes: AIN1 channel, used to receive engine oil signal; AIN2 channel, used to receive water temperature signal; PWM input, used to receive crankshaft speed signal; DO3 relay, used to control ACB closing; The PWM input uses a Hall sensor with a resolution of 0.1 rpm.

4. An engine staged start and load linkage protection method based on dual temperature threshold control, based on the engine staged start and load linkage protection system based on dual temperature threshold control according to any one of claims 1 to 3, characterized in that: include: S1: Obtain Toil and Twater data, wherein Toil is the data returned by the oil temperature sensor, and Twater is the data returned by the water temperature sensor; S2: Performing first-level startup unlocking determination on the Toil and Twater data; S3: Performing a second-level load interlocking determination on the Toil and Twater data.

5. The engine staged start and load linkage protection method based on dual temperature threshold control according to claim 1, characterized in that: The step S2 comprises: S21: Obtaining the preset start unlocking temperature T1; S22: Compare Toil, Twater and T1. If Toil ≥ T1 and Twater ≥ T1, generate an engine ignition command. S23: When the engine ignition command is generated, the controller supplies power to the starter motor.

6. The engine staged start and load linkage protection method based on dual temperature threshold control according to claim 1, characterized in that: The step S3 comprises: S31: Obtaining a preset load interlock temperature T2; S32: Compare Toil, Twater and T2. If Toil ≥ T2 and Twater ≥ T2, generate a load access instruction. S33: When a load connection instruction is generated, the controller sends a closing instruction to the DO3 relay and allows the load to be connected.

7. The engine staged start and load linkage protection method based on dual temperature threshold control according to claim 1, characterized in that: The T1 and / or T2 are determined by the following formula: T = Tadjusted = Tbase + K × H; Wherein, T is the compensation coefficient of T1 and / or T2, and its value range is 0.0025-0.0035°C / m, with a preferred value of 0.003°C / m; H is the altitude above sea level, in meters.

8. The engine staged start and load linkage protection method based on dual temperature threshold control according to claim 1, characterized in that: Also includes sensor fault tolerance schemes: When any temperature sensor fails, it automatically switches to single sensor mode, the T1 value increases by 10°C, and a degraded operation alarm is triggered.

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