An engine control method and system for improving thermal comfort of V-cylinder motorcycles

Abstract

The present invention provides an engine control method and system for improving the thermal comfort of a V-cylinder motorcycle, including: when it is determined that the vehicle meets the conditions for the whole vehicle to reach a hot idle condition, the controller directly cuts off the engine's rear cylinder oil injection, and directly adjusts the idle stepper motor air intake of the rear cylinder to the maximum value, and at the same time increases the preset OFFSET of the engine's front cylinder to maintain the engine speed unchanged; so as to achieve the riding thermal comfort of the whole vehicle under the idle control of the motorcycle. The present invention directly cuts off the engine's rear cylinder oil injection through the controller, so that the rear cylinder does not ignite and cannot generate a heat source, and directly adjusts the idle stepper motor air intake of the rear cylinder to the maximum value, so that fresh air enters the rear cylinder, the cold fluid circulating in the cylinder increases, and the rear cylinder muffler is directly cooled as a cold fluid, ensuring that the cooling performance of the rear cylinder is improved, thereby solving the riding thermal comfort problem of V-cylinder or multi-cylinder motorcycles.

Description

Technical Field

[0001] The invention relates to the field of motorcycles, and in particular to an engine control method and system for improving the thermal comfort of a V-cylinder motorcycle. Background Art

[0002] The twin-cylinder engine of a motorcycle is an internal combustion engine with two cylinders. It usually adopts a V-twin layout, in which the two cylinders are arranged in a V shape. The large-displacement V-twin engine has a higher torque output, which enables the motorcycle to have better climbing and starting capabilities at low speeds, and also provides a smoother acceleration experience; the large-displacement V-twin engine has a higher power output and can provide stronger power, making the motorcycle more stable and safer when driving at high speeds. The twin-cylinder engine is usually arranged on the frame between the front and rear wheels, which makes the center of gravity of the motorcycle lower and improves the handling performance. At the same time, the use of forced water cooling or natural air cooling can effectively reduce the engine temperature and improve the engine's working efficiency and life.

[0003] However, due to the layout of the whole vehicle, the exhaust pipe of the rear cylinder of a V-cylinder motorcycle is usually very close to the driver's legs, which can easily cause the legs to burn when the whole vehicle is idle, seriously affecting the thermal comfort of the whole vehicle. Usually, when encountering such a problem, the most common solution is to increase the heat shield of the muffler or design a double-layer pipe to reduce the heat generated by the muffler, but this method is not only costly and complicated to assemble, but also has no way to fundamentally solve the problem of burning legs. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the legs are burned when the whole vehicle is hot idling, which seriously affects the thermal comfort of riding the whole vehicle.

[0005] In order to solve the above problems, the present invention provides an engine control method and system for improving the thermal comfort of a V-cylinder motorcycle, which is applied to motorcycles equipped with V cylinders or multiple cylinders. The present invention directly stops the injection of fuel in the rear cylinder after judging that the whole vehicle enters the hot idle condition, and at the same time increases the preset offset value (i.e., OFFSET) in the front cylinder of the engine to maintain the engine speed unchanged; when it is determined that the rear cylinder of the engine stops injecting fuel, the front cylinder continues to work, and the air intake volume of the idle stepping motor of the rear cylinder is directly adjusted to the maximum value. The cooling effect is good, so that the whole motorcycle has riding thermal comfort under idle control, solves the problem of legs burning when the whole vehicle is hot idling, ensures the comfort of the driver, and at the same time maintains the stability of the engine speed, which also has an effect on the economy of the whole vehicle, fuel consumption, and the reduction of idling noise.

[0006] The specific technical scheme of the present invention is: In a first aspect, the present invention provides an engine control method for improving thermal comfort of a V-cylinder motorcycle, comprising: When it is determined that the vehicle meets the conditions for the whole vehicle to reach the hot idle condition, the controller directly cuts off the fuel injection to the rear cylinder of the engine, and directly adjusts the air intake volume of the idle stepper motor of the rear cylinder to the maximum value, and at the same time increases the preset OFFSET offset value of the front cylinder of the engine to maintain the engine speed unchanged; so as to achieve the thermal comfort of the whole vehicle under the idle control of the motorcycle.

[0007] Preferably, when the motorcycle satisfies the following conditions at the same time, it is determined whether the motorcycle reaches the hot idle condition: The motorcycle speed signal = 0; The motorcycle engine water temperature>75°C; The motorcycle engine speed is <2000rpm; The motorcycle throttle position sensor signal is <0.8.

[0008] Preferably, when the continuous judgment time of the parameter is greater than 5S and there is no fault in the control system of the engine, the motorcycle reaches a hot idle condition and triggers a cylinder cut-off function.

[0009] Preferably, the front cylinder adds three preset OFFSET offset values, which include preset OFFSET offset values ​​of the front cylinder stepper motor air circuit, the front cylinder ignition fire circuit and the front cylinder injection oil circuit. The front cylinder adds three offsets in advance to maintain the engine speed unchanged and maintain stable idling of the engine.

[0010] Preferably, the preset OFFSET offset value is set by calibrating the whole vehicle, and the maximum air intake value is calibrated by comparing the actual output power of the engine with the engine friction work at the current speed point.

[0011] Preferably, the control method further comprises: Determining whether the rear cylinder of the motorcycle resumes fuel injection; If so, when the rear cylinder resumes fuel injection, the idle stepper motors of the front and rear cylinders reduce the intake volume, the front cylinder exits the offset mode, and the controller executes the closed-loop logic, and the vehicle returns to normal operation; If not, return to continue judging.

[0012] Preferably, the condition for judging whether the rear cylinder of the motorcycle resumes fuel injection is that there is no fault in the control system of the engine and the throttle position sensor signal is >0.9°.

[0013] Preferably, when the motorcycle is in a cylinder cut-off mode, i.e., a single-cylinder working mode: When the cylinder is cut off, the oxygen sensor of the cylinder that is cut off is not diagnosed; When the cylinder is cut off, the total speed and gas volume learning continues to work, and only the gas volume other than the OFFSET offset value is learned; When the cylinder is cut off, the oil circuit learning only works in closed loop, and the self-learning does not work.

[0014] Preferably, when the accelerator is pulled out of the total speed, the system resumes fuel injection, that is, the motorcycle resumes normal operation; when the accelerator is released to a low level, the engine control system enters the total speed, and after a delay of 5S, the motorcycle continues to enter the cylinder cut-off operation.

[0015] In a second aspect, the present invention provides an engine control system for improving the thermal comfort of a V-cylinder motorcycle, the system including but not limited to an ECU controller, an air filter, front / rear cylinder throttle position sensors, front / rear cylinder idle stepper motors, front / rear cylinder injectors, front / rear cylinder intake pressure sensors, a water temperature sensor, a vehicle speed sensor and a rotation speed sensor.

[0016] In summary, compared with the prior art, the beneficial effects of the present invention are: The present invention directly cuts off the fuel injection to the rear cylinder of the engine through a controller, so that the rear cylinder does not ignite and cannot generate a heat source, and directly adjusts the air intake of the idle stepper motor of the rear cylinder to a maximum value, so that fresh air enters the rear cylinder, and the cold fluid circulating in the cylinder is increased. The cold fluid directly cools the rear cylinder muffler, thereby ensuring that the cooling performance of the rear cylinder is improved, thereby solving the problem of riding thermal comfort of V-cylinder or multi-cylinder motorcycles.

[0017] The present invention increases a preset OFFSET offset value in the front cylinder of the engine to maintain the engine speed unchanged, thereby reducing the manufacturing cost of the engine without affecting the drivability of the entire vehicle, and reducing the economy, fuel consumption and idling noise of the entire vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the control system of the present invention.

[0019] Figure 2 Flow chart of the control method of the present invention.

[0020] Figure numerals: 1. Air filter; 2. Front cylinder throttle position sensor; 3. Rear cylinder throttle position sensor; 4. Front cylinder injector; 5. Rear cylinder injector; 6. Water temperature sensor; 7. Speed ​​sensor; 8. Rear cylinder idle stepper motor; 9. Front cylinder idle stepper motor; 10. Front cylinder intake pressure sensor; 11. Rear cylinder intake pressure sensor; 12. Vehicle speed sensor; 13. Rear cylinder; 14. Front cylinder DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0022] The design of a V-twin motorcycle places the rear cylinder close to the rider's crotch, so it may feel hotter than other engine types when riding. This is especially true for air-cooled or air-oil-cooled V-twin motorcycles with larger displacements, where this feeling is more pronounced when riding at low speeds for long periods of time.

[0023] Due to the layout of the whole vehicle, the exhaust pipe of the rear cylinder of a V-cylinder motorcycle is usually very close to the driver's legs, which can easily cause the legs to burn when the whole vehicle is idle, seriously affecting the thermal comfort of the whole vehicle. Usually, when encountering such a problem, the most common solution is to reduce the heat generated by the muffler by adding a muffler heat shield or designing a double-layer pipe. This method is not only costly and complicated to assemble, but also has no way to fundamentally solve the problem of burning legs.

[0024] Embodiment 1: like Figure 1 As shown, an engine control system for improving the thermal comfort of a V-cylinder motorcycle is provided, which is applied to a motorcycle equipped with a V-cylinder, including a front cylinder and a rear cylinder. The system includes but is not limited to an ECU controller, an air filter, a front / rear cylinder throttle position sensor, a front / rear cylinder idle stepper motor, a front / rear cylinder injector, a front / rear cylinder intake pressure sensor, a water temperature sensor, a vehicle speed sensor and a rotation speed sensor.

[0025] The ECU controller may include an electronic control unit or a computer program running on a dedicated or shared computing resource, receiving electrical signals from sensors, processing and analyzing the signals, and issuing control signals according to a predetermined control strategy. The ECU determines the target idle speed according to the working state and load of the engine, compares it with the actual speed, and adjusts the intake volume through the controller to make the idle speed of the engine reach the target value. Front / rear cylinder throttle position sensor, front / rear cylinder intake pressure sensor, water temperature sensor, vehicle speed sensor and speed sensor are used to detect various operating parameters of the engine, such as intake pipe pressure, speed, temperature, air flow, etc. These sensors convert the detected signals into electrical signals and transmit them to the ECU for processing.

[0026] The air filter is an important part of the motorcycle engine intake system. It is responsible for filtering the air entering the engine, making the air entering the engine as pure as possible, reducing dust and sand in the air, and extending the life of the engine. The front / rear cylinder injectors are responsible for injecting fuel according to the needs of the engine. The amount of fuel injected by the injectors often affects the engine's idle stability and fuel consumption. The idle stepper motor receives instructions from the ECU controller to control the engine's idle speed. The essence of the control is to control the intake volume of the engine when it is idling.

[0027] Motorcycle hot idle refers to the stable speed of the engine under no-load condition after the engine reaches normal operating temperature. In this state, the engine idle speed is usually high, because as the engine temperature rises, the internal resistance decreases. If the intake volume during cold start is still used, the idle speed will be too high.

[0028] Therefore, Figure 2 As shown, specifically, a V-cylinder motorcycle engine control method is adopted, including the following steps: S1, judging whether the motorcycle reaches the hot idle condition. When the program is executed, the motorcycle must meet all the following conditions at the same time: the motorcycle speed signal = 0; the motorcycle engine water temperature > 75°C; the motorcycle engine speed < 2000rpm; the motorcycle throttle position sensor signal < 0.8.

[0029] At the same time, the above parameters need to be judged continuously for a time period of >5S, that is, when the idling time exceeds 5 seconds and there is no fault in the control system of the engine, it means that the motorcycle reaches the hot idle condition.

[0030] It should be noted that when the engine water temperature is higher than 75 degrees, a 5-degree buffer is required to prevent the water circuit from being opened and closed frequently. Frequent opening of the water circuit will affect the efficiency of the cooling system and affect the performance and life of the engine.

[0031] If the above conditions are not met, the vehicle will return to continue judging and will not trigger the cylinder cut-off function. If the conditions continue to be not met, it is necessary to rule out whether there is a fault in the control system.

[0032] S2. If all the above conditions are met, that is, when it is determined that the vehicle meets the conditions for the vehicle to reach the hot idle condition, the cylinder cut-off function is triggered. The controller ECU program directly cuts off the engine and then sprays fuel into the cylinder.

[0033] When the cylinder cut-off is triggered, the rear cylinder cuts off fuel, and the idle stepper motor intake of the rear cylinder is directly adjusted to the maximum value. After the rear cylinder of the engine stops spraying fuel, the front cylinder continues to work. When the controller cuts off the rear cylinder fuel injection, the front cylinder of the engine adds a preset OFFSET of the gas circuit, fire circuit and oil circuit to maintain the engine speed unchanged; When the maximum intake volume is directly fed to the rear cylinder, the front cylinder at this time increases the preset front cylinder stepper motor air path offset, that is, the front cylinder also feeds more intake volume to maintain the idling stability. At this time, the motorcycle switches from the dual-cylinder working mode to the single-cylinder engine working mode. The increased intake volume is the calibration value set by the offset. The offset is increased to increase the intake volume of the front cylinder. At the same time, in order to facilitate the control of the rear cylinder, the offset value is also used, and the intake volume of the rear cylinder is also increased. This part of the air can also be used to cool the three-way catalytic converter of the rear cylinder to improve the cooling effect of the rear cylinder.

[0034] The OFFSET value setting is achieved through vehicle calibration. The maximum intake volume value can also be achieved through calibration. Different engines have different intake volume values. The specific calibration can be achieved by comparing the actual output power of the engine with the engine friction work at the current speed point.

[0035] It should be noted that the three steps of cutting off the oil supply to the rear cylinder, pre-increasing three offsets to the front cylinder, and directly adjusting the air intake of the idle stepper motor of the rear cylinder to the maximum are completed at the same time.

[0036] The purpose of directly cutting off the fuel injection in the rear cylinder is to stop combustion in the rear cylinder, so that the rear cylinder does not burn, but the front cylinder continues to work. At this time, the rear cylinder no longer generates heat source.

[0037] When the cylinder is cut off, the engine speed will change. Specifically, when a cylinder is cut off (i.e. stops working), due to the reduction in total power, the engine speed will drop accordingly to reach a new balance. If the working capacity of each cylinder is balanced, the amplitude of the speed drop after each cylinder stops working should be basically equal. On the contrary, if there is a large difference in the speed drop values ​​of each cylinder, it may indicate that some cylinders are not working properly. In this embodiment, three offsets are pre-added to the front cylinder, including the front cylinder stepper motor intake, front cylinder ignition and front cylinder injection, to maintain the engine speed unchanged. The offset value setting can be achieved through vehicle calibration.

[0038] Directly adjust the idle stepper motor intake volume of the rear cylinder to the maximum to ensure the cooling of the rear cylinder muffler. Such operation can improve the power output and fuel efficiency of the motorcycle and maintain the stability and performance of the engine.

[0039] S3, determining whether the rear cylinder of the motorcycle resumes fuel injection, allowing the whole vehicle to operate normally; If yes, proceed to the next step S4; if no, return to S3 to continue judging.

[0040] Program execution requires all of the following conditions to be met: 1. The system has no faults 2. Throttle position sensor signal > 0.9°.

[0041] S4. When the above conditions are met, it means that the rear cylinder resumes fuel injection, and the motorcycle control system exits the cylinder cut-off mode. When the rear cylinder resumes fuel injection, the idle stepper motors of the front and rear cylinders both reduce the intake volume, and the front cylinder exits the offset mode. At the same time, the controller ECU program executes the closed-loop logic, and the rear cylinder directly resumes normal operation. The engine is guided to operate normally according to the original calibration data. The motorcycle switches from the single-cylinder operating mode to the dual-cylinder engine operating mode, and the entire vehicle resumes normal operation.

[0042] Closed-loop logic refers to the closed-loop control of the engine controller, that is, by controlling the oxygen sensor signal, the fuel injection amount is adjusted in real time to ensure that the mixture reaches the ideal state. In this embodiment, the engine air-fuel ratio is controlled to 1. Under the closed-loop control state, the engine will adjust the fuel injection amount in real time according to the feedback information. The controller receives the signal of the oxygen sensor and adjusts the fuel injection amount according to this information to ensure that the air-fuel ratio reaches the most ideal level. Closed-loop control can make the fuel injection amount more accurate, thereby improving engine efficiency, fuel economy and emission performance.

[0043] It is worth noting that when the motorcycle is in the cylinder cut-off mode, that is, the single-cylinder working mode: When the cylinder is cut off, the oxygen sensor of the cylinder that is cut off is not diagnosed; When the cylinder is cut off, the total speed and gas volume learning continues to work, and only the gas volume other than OFFSET is learned; When the cylinder is cut off, the oil circuit learning only works in closed loop, and the self-learning does not work.

[0044] In the cylinder cutout state, the oxygen sensor of the disconnected cylinder will not be diagnosed by the system. The oxygen sensor is used to monitor the oxygen content in the exhaust gas to optimize fuel injection and reduce emissions. If a cylinder is cutout, the data from its oxygen sensor will not be used to adjust the operation of the engine.

[0045] Offset mode only works in neutral or clutch, such as 1st gear throttle release to low coasting does not work. In 1st gear and throttle release coasting, cylinder cut-off will not start, avoiding unnecessary cylinder disconnection at low speed or when power output is required. Offset mode is mainly for engine hot idle conditions. The key to engine hot idle is to simultaneously meet the program-set engine speed, throttle load, and clutch in neutral.

[0046] Regarding the study of gas volume outside the offset, it is mainly for the whole vehicle to leave the hot idle condition and enter the normal operating state, try to ensure that the whole vehicle does not enter the offset. The throttle opening can be slightly larger or slightly smaller.

[0047] When the cylinder is cut off, the oil circuit learning only works in closed loop, and self-learning does not work, which means that when the engine is cut off, the ECU will only rely on the closed-loop control strategy to adjust the oil circuit, and will not perform self-learning adjustments, ensuring the safety and efficiency of the engine under atypical operating conditions, while avoiding the data obtained under these conditions from affecting the long-term learning adjustments of the ECU.

[0048] When the accelerator is pulled out of the total speed, the system resumes fuel injection, that is, the motorcycle resumes normal operation; when the accelerator is released to the bottom, the engine control system enters the total speed mode, and after a delay of 5S, the motorcycle continues to enter the cylinder cut-off working state.

[0049] This part of the technical solution has no impact on the rideability of the entire vehicle, and ensures that the motorcycle will not trigger the cylinder cut-off function under other circumstances, ensuring stable operation during the riding process.

[0050] The present invention uses a stepper motor to quickly increase the intake volume of the whole vehicle under hot idle conditions, wherein the front cylinder is used for combustion and the rear cylinder is used for exhaust pipe cooling. The present invention optimizes the engine control method strategy, that is, when the whole vehicle enters the hot idle condition, the rear cylinder directly stops spraying fuel, and increases the intake volume of the front cylinder by presetting the offset to maintain the engine idle stability. At the same time, the rear cylinder stops spraying fuel, so that the rear cylinder does not burn or ignite, and the front cylinder continues to work. The rear cylinder cannot generate a heat source, but the intake continues, so that the cold air can directly cool the exhaust pipe, that is, at the same time, fresh air enters the rear cylinder, which directly cools the rear cylinder muffler as a cold fluid, thereby completely solving the riding thermal comfort problem of V-cylinder motorcycles, and also has an effect on the economy of the whole vehicle, fuel consumption, and the reduction of idling noise.

[0051] The control method of the present invention is applied to motorcycles equipped with V-cylinder engines, and can also be applied to motorcycles with engines having larger valve bodies, such as 921 four-cylinder engines.

[0052] The air intake volume of a motorcycle engine when it is running is the main channel plus the bypass channel. The air intake volume of the main channel is mainly controlled by the opening of the throttle body valve. Usually, a certain opening is set at the factory as the main channel opening reserved for idle speed. The remaining opening is controlled by the driver turning the throttle handle to control the air intake volume through the main channel, thereby achieving control of the engine output power and torque.

[0053] Furthermore, in addition to the present invention reducing the exhaust pipe temperature of the rear cylinder by cutting off the oil supply, the idle throttle opening of the large-caliber valve body can also be increased to solve the problem of the rear muffler temperature being too high and burning the legs when the car is parked.

[0054] In addition, for the comparative examples in the prior art, such as the publication number CN117552879A, the patent name is an idle speed control method and a motorcycle. The technical solution of the idle speed control method disclosed in the comparative document is to first slowly adjust the gas circuit indicated torque request value until the gas circuit indicated torque request value is increased to a first preset value, and then trigger the cylinder cut-off function to cut off the oil supply to the rear cylinder. After the oil supply to the rear cylinder is cut off, the gas circuit indicated torque request value continues to increase to a second preset value, and the motorcycle is switched from the dual-cylinder mode to the single-cylinder mode.

[0055] The scheme of setting a preset time period and slowly adding gas to a certain degree before cutting off the fuel injection in the comparative example has the following disadvantages compared with the scheme of directly cutting off the fuel injection in the rear cylinder and directly adding gas to the rear cylinder to the maximum value in the present embodiment, and immediately stopping the fuel injection in the rear cylinder to reduce the generation of heat source in the rear cylinder: Difference in cooling effect: The prior art uses a solution that triggers cylinder cut-off after slowly supplying gas, which relies on increasing the gas path indicated torque request value to achieve cooling. Because it involves a process of gradually increasing the gas path indicated torque request value, the response speed is slow and the complexity of the control system is increased. However, this embodiment directly cuts off the oil supply to the rear cylinder, which has a fast response speed and is more direct and simple to operate. After the rear cylinder of the engine stops spraying oil, the idle stepper motor intake of the rear cylinder is directly adjusted to the maximum, and a large amount of air is directly supplied to the rear cylinder. A large amount of air causes an increase in the cold fluid circulating in the cylinder, and the three-way catalytic converter on the motorcycle is directly cooled by the cold fluid. The increased airflow can quickly and directly take away the heat, directly acting on the cooling process, ensuring that the cooling performance of the rear cylinder is improved, and the temperature is reduced more rapidly. The cooling effect is better than that of the slow air supply and oil cut-off in the control ratio, which completely solves the riding thermal comfort problem of V-cylinder motorcycles.

[0056] In addition, the present invention adds a preset offset to maintain the engine speed unchanged in the cylinder cut-off mode. This value can be achieved through calibration. The front cylinder intake is used for combustion, and the rear cylinder intake is used for cooling. On the basis of solving the problem of riding comfort of V-cylinder motorcycles, the idle speed can be maintained consistent, the engine can be kept stable in the cylinder cut-off mode, and energy consumption and engine wear can be reduced.

[0057] In addition, after the rear cylinder resumes fuel injection, the offset does not work, the front and rear cylinder idle stepper motors simultaneously reduce the intake volume, the ECU program executes closed-loop logic, and the entire vehicle directly resumes normal operation with a fast response speed.

[0058] In contrast to the prior art, a cooling, heat-insulating and anti-scalding device is often designed, such as adding a guard mounting structure to a motorcycle muffler, including a fixed bracket fixedly connected to the outer wall of the muffler and a connecting bracket fixedly connected to the inner wall of the guard. The fixed bracket is provided with a slide groove, and the connecting bracket can slide into the slide groove from one end of the fixed bracket so that the slide groove positions the connecting bracket. The fixed bracket is also provided with a fastener that can connect the fixed bracket and the connecting bracket after the connecting bracket slides into the slide groove.

[0059] Although adding a shield installation structure to the muffler can improve the anti-scalding effect of the shield, or designing a cooling water pipe and a heat-insulating pipe to circulate and cool the exhaust pipe body using the principle of heat convection, this type of method is not only costly and complex to assemble, but also has no way to fundamentally solve the problem of scalding legs. However, this embodiment does not require the installation of a shield, and only needs to change the control strategy to fundamentally solve the problem of scalding legs, which has good economic benefits, is easy to control, and reduces energy consumption.

[0060] In summary, compared with the prior art, the beneficial effects of the present invention are: (1) The present invention directly cuts off the fuel injection to the rear cylinder of the engine through a controller, so that the rear cylinder does not ignite and cannot generate a heat source, and directly adjusts the air intake of the idle stepper motor of the rear cylinder to a maximum value, so that fresh air enters the rear cylinder. The cold fluid circulating in the cylinder increases, and the cold fluid directly cools the rear cylinder muffler, thereby ensuring that the cooling performance of the rear cylinder is improved, thereby solving the problem of riding thermal comfort of V-cylinder or multi-cylinder motorcycles.

[0061] (2) The present invention adds a preset OFFSET to the front cylinder of the engine to maintain the engine speed unchanged, thereby reducing the manufacturing cost of the engine without affecting the drivability of the entire vehicle. The economy, fuel consumption, and idling noise of the entire vehicle are all reduced.

[0062] The present invention solves the riding thermal comfort problem of the V-cylinder motorcycle by formulating a reasonable and comprehensive control strategy for the V-cylinder, which not only reduces the manufacturing cost of the engine without affecting the drivability of the vehicle, but also improves the economy of the vehicle.

[0063] The above embodiments are further elaborations and illustrations of the present invention for ease of understanding, and are not limitations of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An engine control method for improving thermal comfort of a V-cylinder motorcycle, characterized in that: Applied to a motorcycle equipped with a V-cylinder or multiple cylinders, the method comprises: When it is determined that the vehicle meets the conditions for reaching the hot idle condition, the controller directly cuts off the fuel injection to the rear cylinder of the engine and directly adjusts the air intake of the idle stepper motor of the rear cylinder to the maximum value. At the same time, the preset offset value is increased to maintain the engine speed unchanged.

2. The engine control method for improving thermal comfort of a V-cylinder motorcycle according to claim 1, characterized in that: When the motorcycle satisfies the following conditions at the same time, it is determined whether the motorcycle has reached the hot idle condition: The motorcycle speed signal = 0; The motorcycle engine water temperature>75°C; The motorcycle engine speed is <2000rpm; The motorcycle throttle position sensor signal is <0.

8.

3. The engine control method for improving thermal comfort of a V-cylinder motorcycle according to claim 2, characterized in that: When the continuous judgment time of the parameter is greater than 5S and there is no fault in the control system of the engine, the motorcycle reaches a hot idle condition and the cylinder cut-off function is triggered.

4. According to the engine control method for improving the thermal comfort of a V-cylinder motorcycle as described in claim 1, the front cylinder adds three preset offset values, and the preset offset values ​​include the preset offset values ​​of the front cylinder stepper motor air circuit, the front cylinder ignition fire circuit and the front cylinder injection oil circuit.

5. According to the engine control method for improving the thermal comfort of a V-cylinder motorcycle as described in claim 4, the offset value setting is achieved through vehicle calibration, and the maximum intake volume value is achieved through calibration by comparing the actual output power of the engine with the engine friction work at the current speed point.

6. The engine control method for improving thermal comfort of a V-cylinder motorcycle according to claim 3 or 5, the control method further comprising: Determining whether the rear cylinder of the motorcycle resumes fuel injection; If so, when the rear cylinder resumes fuel injection, the idle stepper motors of the front and rear cylinders reduce the intake volume, the front cylinder exits the offset mode, and the controller executes the closed-loop logic, and the vehicle resumes normal operation; If not, return to continue judging.

7. The engine control method for improving thermal comfort of a V-cylinder motorcycle according to claim 6, characterized in that: The condition for judging whether the rear cylinder of the motorcycle resumes fuel injection is that there is no fault in the control system of the engine and the throttle position sensor signal is greater than 0.9°.

8. The engine control method for improving thermal comfort of a V-cylinder motorcycle according to claim 7, characterized in that: When the motorcycle is in the cylinder cut-off mode, that is, the single-cylinder working mode: When the cylinder is cut off, the oxygen sensor of the cylinder that is cut off is not diagnosed; When the cylinder is cut off, the total speed and gas volume learning continues to work, and only the gas volume other than the offset value is learned; When the cylinder is cut off, the oil circuit learning only works in closed loop, and the self-learning does not work.

9. The engine control method for improving thermal comfort of a V-cylinder motorcycle according to claim 8, characterized in that: When the accelerator is pulled out of the total speed, the system resumes fuel injection, that is, the motorcycle resumes normal operation; when the accelerator is released to a low level, the engine control system enters the total speed, and after a delay of 5S, the motorcycle continues to enter the cylinder cut-off operation.

10. An engine control system for improving thermal comfort of a V-cylinder motorcycle, adopting the engine control method for improving thermal comfort of a V-cylinder motorcycle described in claim 1 to 8, characterized in that: The system includes but is not limited to an ECU controller, an air filter, a front / rear cylinder throttle position sensor, a front / rear cylinder idle stepper motor, a front / rear cylinder injector, a front / rear cylinder intake pressure sensor, a water temperature sensor, a vehicle speed sensor and a rotation speed sensor.

Images