CN114370340A - Exhaust brake device and control method - Google Patents
Exhaust brake device and control method Download PDFInfo
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- CN114370340A CN114370340A CN202111665592.5A CN202111665592A CN114370340A CN 114370340 A CN114370340 A CN 114370340A CN 202111665592 A CN202111665592 A CN 202111665592A CN 114370340 A CN114370340 A CN 114370340A
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- Prior art keywords
- ecu
- engine
- rotating speed
- exhaust
- accelerator pedal
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/04—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning exhaust conduits
- F02D9/06—Exhaust brakes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/06—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for braking
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/04—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation using engine as brake
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
- F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
Abstract
The invention discloses an exhaust brake device and an exhaust brake method, which comprise an exhaust pipe, a turbocharger and an ECU (electronic control unit) connected to an engine, wherein the ECU can monitor the position of an accelerator pedal and the rotating speed of the engine in real time, an exhaust manifold on the exhaust pipe is connected with the air inlet end of the turbocharger, a regulating valve is connected in an air outlet pipe of the turbocharger, a pressure sensor capable of monitoring the gas pressure in the exhaust manifold in real time is arranged on the exhaust manifold, the regulating valve and the pressure sensor are electrically connected with the ECU, and the ECU controls the opening degree of the regulating valve after receiving the numerical value of the pressure sensor. The invention is suitable for engines with turbochargers of various types, and has the advantages of simple structure, low cost, accurate control of brake back pressure and guarantee of exhaust brake effect.
Description
Technical Field
The invention relates to the field of brake control of engines, in particular to an exhaust brake device and a control method.
Background
Exhaust braking is a commonly used auxiliary braking mode of an engine, and when the back pressure of the exhaust braking is too high, damage to a valve mechanism of the engine can be caused, so measures need to be taken, and the brake back pressure is measured and limited. For a turbocharged engine, because of the existence of the supercharger, the pressure before and after the supercharger has a large difference, the pressure directly acting on the valve actuating mechanism of the engine needs to be detected, so that the work of the exhaust braking system is more stable and reliable.
There are two main existing solutions: 1. the mechanical pressure limiting valve is characterized in that a spring mechanism is arranged on the exhaust brake valve, and when the brake back pressure is too high, the spring is pushed to release pressure. 2. The pressure is limited by electric control, a pressure sensor is arranged near the exhaust brake valve, and the brake valve is controlled to open or close by an electromagnetic switch or a servo motor. The damage risk of overhigh exhaust brake back pressure mainly acts on a valve mechanism, and for a turbocharged engine, the existing technical scheme detects the exhaust brake back pressure behind a turbocharger instead of the gas pressure directly acting on the valve mechanism, and the problem of detection result error exists. Different superchargers can produce different pressure differentials, and if a mechanical spring structure is adopted, the spring can produce elasticity attenuation after long-time high-temperature use, so that the pressure is released in advance, the brake back pressure is insufficient, and the brake effect is reduced.
The patent document No. CN110410198A discloses an auxiliary exhaust brake system of a supercharger, which comprises a variable-section supercharger, an intercooler 3 and an engine body, wherein an exhaust air inlet of the variable-section supercharger is connected with an engine exhaust manifold of the engine body, an air outlet of the variable-section supercharger is connected with an engine air inlet pipe of the engine body through the intercooler, the auxiliary exhaust brake system also comprises an ECU and an air inlet pressure sensor arranged in the engine air inlet pipe, a variable-section execution mechanism is arranged in the variable-section supercharger, the ECU is used for receiving an accelerator pedal position signal, an engine rotating speed signal, an auxiliary brake signal and an air inlet pressure signal, and the ECU controls a throttle according to the interface execution mechanism so as to control the size of the section of an air inlet channel of the variable-section supercharger, thereby regulating and controlling the brake pressure and meeting the calibration requirement of the MAP of the engine. The variable-section superchargers with various structures, such as a variable throat supercharger, a tongue piece supercharger and the like, are required to be used, and because different superchargers are manufactured by different manufacturers and have different structures, the superchargers with special models need to be matched with different control systems independently, so that the production cost of the engine is increased, and the workload of the engine during calibration is increased.
Disclosure of Invention
The first technical problem to be solved by the invention is to provide an exhaust brake device, which can be applied to turbochargers of any type, can directly measure the brake back pressure on the whole gas distribution system, and can accurately detect and control the exhaust brake pressure.
In order to solve the technical problem, the provided exhaust braking device comprises an exhaust pipe, a turbocharger and an ECU (electronic control unit) connected to an engine, wherein the ECU can monitor the position of an accelerator pedal and the rotating speed of the engine in real time.
The ECU is internally provided with a signal receiving unit, the accelerator pedal is connected with a position sensor, the engine is connected with a rotating speed sensor, the position sensor and the rotating speed sensor are electrically connected with the signal receiving unit, the ECU is also internally provided with a control unit, and a control valve is electrically connected with the control unit.
And the ECU is also internally provided with a comparison unit which is used for comparing the value of the rotating speed sensor with the set rotating speed of the engine and sending the comparison result to the control unit.
The engine is connected with a brake switch, the regulating valve is driven by brake switch power, and the brake switch is electrically connected with the ECU.
After the structure is adopted, the turbocharger with a special structure is not needed, the ECU in the existing engine is utilized, the minimum change is made, the structure is simple, the cost is low, and the pressure value in the exhaust pipe can be accurately monitored, so that the accurate brake back pressure is provided, and the exhaust brake effect of the engine is ensured.
The second technical problem to be solved by the invention is to provide an exhaust braking method, which comprises an engine, wherein the exhaust braking device comprises the following steps:
1) the ECU controls the regulating valve, and receives an accelerator pedal position signal and an engine rotating speed signal in real time;
2) after the ECU receives signals of the position of an accelerator pedal and the rotating speed of an engine, the change value of the signals is monitored in real time, and the ECU controls the working state of the regulating valve in real time according to the pressure value transmitted by the pressure sensor.
When the ECU obtains that the electric signal of the position of the accelerator pedal is not 0; the ECU obtains the electric signal of the position of the accelerator pedal as 0, and when the ECU receives the electric signal of the rotating speed sensor in time, the real-time rotating speed of the engine is not higher than the set rotating speed; the ECU controls the regulating valve to stop working; when the ECU obtains the electric signal of the accelerator pedal position as 0 and the ECU receives the electric signal of the rotating speed sensor in time, the real-time rotating speed of the engine is higher than the set rotating speed; and the ECU controls the regulation valve to work, and the regulation valve reaches a set opening degree to meet the calibration value in the calibration data MAP in the brake back pressure of the engine.
When the ECU obtains the electric signal of the accelerator pedal position as 0 and the ECU receives the electric signal of the rotating speed sensor in time, the real-time rotating speed of the engine is higher than the set rotating speed, and the oil injection quantity of the engine is set to be 0 through the ECU.
After the method is adopted, the working state of the engine is determined through the acquired position of the accelerator pedal and the engine rotating speed, namely whether the back pressure needs to be braked and whether the exhaust brake is needed are determined, and the ECU controls the opening and closing degree of the regulating and controlling valve in real time according to the pressure value transmitted by the pressure sensor, so that the calibration value in the calibration data MAP in the brake back pressure of the engine is fully met.
In conclusion, the invention is suitable for engines with turbochargers of various types, and has the advantages of simple structure, low cost, accurate control of brake back pressure and guarantee of exhaust brake effect.
Drawings
The invention is further described with reference to the accompanying drawings in which:
FIG. 1 is a schematic structural diagram of one embodiment of the present invention;
fig. 2 is a control flow diagram of the present invention.
Detailed Description
As shown in fig. 1 and 2, the present invention provides an exhaust brake device including an exhaust pipe 1 connected to an engine, a turbocharger 2, and an ECU, which can monitor an accelerator pedal position and an engine speed in real time, an exhaust manifold 11 on the exhaust pipe 1 is connected with the air inlet end of the turbocharger 2, a regulating valve 3 is connected in the air outlet pipe of the turbocharger 2, the exhaust manifold 11 is provided with a pressure sensor 12 capable of monitoring the gas pressure in the exhaust manifold in real time, the regulating valve 3 and the pressure sensor 12 are electrically connected with the ECU, the ECU controls the opening of the regulating valve 3 after receiving the value of the pressure sensor 12, specifically, according to the calibration value (prior art) in the calibration data MAP in the brake back pressure of the engine, the relationship between the value of the gas pressure and the opening degree of the regulator valve can be obtained, so that the above control can be performed.
As shown in fig. 1 and 2, a signal receiving unit is arranged in the ECU, a position sensor is connected to the accelerator pedal, a rotation speed sensor is connected to the engine, the position sensor and the rotation speed sensor are both electrically connected to the signal receiving unit, a control unit is further arranged in the ECU, and the control valve is electrically connected to the control unit. And the ECU is also internally provided with a comparison unit which is used for comparing the value of the rotating speed sensor with the set rotating speed of the engine and sending the comparison result to the control unit. In the embodiment, the engine is connected with a brake switch 4, the regulating valve is driven by the brake switch 4, and the brake switch 4 is electrically connected with the ECU. The invention only needs to be provided with a plurality of sensors, does not need a turbocharger with a special structure, has small change on the engine and simple structure, can be suitable for turbochargers with different models, and ensures the monitoring precision, thereby ensuring the accurate realization of the brake back pressure.
Referring to the accompanying drawings, the invention also provides an exhaust braking method, which comprises an engine, and the exhaust braking device adopting the structure comprises the following steps: 1) the ECU controls the regulating valve, and receives an accelerator pedal position signal and an engine rotating speed signal in real time; 2) after the ECU receives signals of the position of an accelerator pedal and the rotating speed of the engine, the change value of the signals is monitored in real time, and the ECU controls the working state of the regulating valve.
Referring to the attached drawings, the specific control process is as follows, when the ECU obtains that the electric signal of the accelerator pedal position is not 0; the ECU obtains the electric signal of the position of the accelerator pedal as 0, and when the ECU receives the electric signal of the rotating speed sensor in time, the real-time rotating speed of the engine is not higher than the set rotating speed; the ECU controls the regulating valve to stop working; when the ECU obtains the electric signal of the accelerator pedal position as 0 and the ECU receives the electric signal of the rotating speed sensor in time, the real-time rotating speed of the engine is higher than the set rotating speed; and the ECU controls the regulation valve to work, and the regulation valve reaches a set opening degree to meet the calibration value in the calibration data MAP in the brake back pressure of the engine. When the ECU obtains the electric signal of the accelerator pedal position as 0 and the ECU receives the electric signal of the rotating speed sensor in time, the real-time rotating speed of the engine is higher than the set rotating speed, and the oil injection quantity of the engine is set to be 0 through the ECU. The fact that the electric signal of the position of the accelerator pedal is 0 means that the accelerator pedal does not act and the electric signal transmitted by the position sensor is 0; the set rotation speed may be an idle speed of the engine.
The invention is not limited to the embodiments described above, but equivalent variations of the specific structures and simple substitutions of method steps based on the present invention are within the scope of the invention as will be apparent to those skilled in the art.
Claims (7)
1. The utility model provides an exhaust brake device, is including connecting blast pipe, turbo charger and ECU on the engine, ECU can real-time supervision accelerator pedal position and engine speed, its characterized in that, exhaust manifold on the blast pipe is connected with turbo charger's inlet end, and turbo charger's outlet duct in-connection has the regulation and control valve, exhaust manifold is last to be equipped with the pressure sensor that can real-time supervision gas pressure in the exhaust manifold, and regulation and control valve, pressure sensor all are connected with the ECU electricity, and ECU receives the numerical value of pressure sensor and controls the aperture size of regulation and control valve.
2. The exhaust brake device according to claim 1, characterized in that: the ECU is internally provided with a signal receiving unit, the accelerator pedal is connected with a position sensor, the engine is connected with a rotating speed sensor, the position sensor and the rotating speed sensor are electrically connected with the signal receiving unit, the ECU is also internally provided with a control unit, and a control valve is electrically connected with the control unit.
3. The exhaust brake device according to claim 2, characterized in that: and the ECU is also internally provided with a comparison unit which is used for comparing the value of the rotating speed sensor with the set rotating speed of the engine and sending the comparison result to the control unit.
4. The exhaust brake device according to any one of claims 1 to 3, characterized in that: the engine is connected with a brake switch, the regulating valve is driven by brake switch power, and the brake switch is electrically connected with the ECU.
5. An exhaust brake method including an engine, characterized by using the exhaust brake device according to any one of claims 1 to 4, comprising the steps of:
1) the ECU controls the regulating valve, and receives an accelerator pedal position signal and an engine rotating speed signal in real time;
2) after the ECU receives signals of the position of an accelerator pedal and the rotating speed of the engine, the change value of the signals is monitored in real time, and the ECU controls the working state of the regulating valve.
6. The exhaust brake method according to claim 5, characterized in that the ECU obtains when the electric signal of the accelerator pedal position is not 0; the ECU obtains the electric signal of the position of the accelerator pedal as 0, and when the ECU receives the electric signal of the rotating speed sensor in time, the real-time rotating speed of the engine is not higher than the set rotating speed; the ECU controls the regulating valve to stop working;
when the ECU obtains the electric signal of the accelerator pedal position as 0 and the ECU receives the electric signal of the rotating speed sensor in time, the real-time rotating speed of the engine is higher than the set rotating speed; and the ECU controls the regulation valve to work, and the regulation valve reaches a set opening degree to meet the calibration value in the calibration data MAP in the brake back pressure of the engine.
7. The engine speed sensor air gap measuring method according to claim 6, characterized in that: when the ECU obtains the electric signal of the accelerator pedal position as 0 and the ECU receives the electric signal of the rotating speed sensor in time, the real-time rotating speed of the engine is higher than the set rotating speed, and the oil injection quantity of the engine is set to be 0 through the ECU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111665592.5A CN114370340A (en) | 2021-12-31 | 2021-12-31 | Exhaust brake device and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111665592.5A CN114370340A (en) | 2021-12-31 | 2021-12-31 | Exhaust brake device and control method |
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| Publication Number | Publication Date |
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| CN114370340A true CN114370340A (en) | 2022-04-19 |
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| CN202111665592.5A Pending CN114370340A (en) | 2021-12-31 | 2021-12-31 | Exhaust brake device and control method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007303393A (en) * | 2006-05-11 | 2007-11-22 | Toyota Motor Corp | Energy recovery device |
| JP2008303743A (en) * | 2007-06-05 | 2008-12-18 | Toyota Motor Corp | Energy recovery device |
| JP2010001780A (en) * | 2008-06-19 | 2010-01-07 | Toyota Motor Corp | Exhaust gas recovery device |
| JP2016056767A (en) * | 2014-09-11 | 2016-04-21 | マツダ株式会社 | Exhaust gas recirculation control device for engine |
| EP3032078A2 (en) * | 2014-12-12 | 2016-06-15 | Toyota Jidosha Kabushiki Kaisha | Control device for internal combustion engine |
| WO2017018220A1 (en) * | 2015-07-30 | 2017-02-02 | いすゞ自動車株式会社 | Engine brake system and method for controlling engine brake |
-
2021
- 2021-12-31 CN CN202111665592.5A patent/CN114370340A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007303393A (en) * | 2006-05-11 | 2007-11-22 | Toyota Motor Corp | Energy recovery device |
| JP2008303743A (en) * | 2007-06-05 | 2008-12-18 | Toyota Motor Corp | Energy recovery device |
| JP2010001780A (en) * | 2008-06-19 | 2010-01-07 | Toyota Motor Corp | Exhaust gas recovery device |
| JP2016056767A (en) * | 2014-09-11 | 2016-04-21 | マツダ株式会社 | Exhaust gas recirculation control device for engine |
| EP3032078A2 (en) * | 2014-12-12 | 2016-06-15 | Toyota Jidosha Kabushiki Kaisha | Control device for internal combustion engine |
| WO2017018220A1 (en) * | 2015-07-30 | 2017-02-02 | いすゞ自動車株式会社 | Engine brake system and method for controlling engine brake |
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