Engine auxiliary brake control system and vehicle

Abstract

The present invention discloses an engine auxiliary braking control system, including an engine controller and an engine auxiliary braking function button switch electrically connected to the engine controller; when the engine controller determines that a preset auxiliary braking trigger condition is met, the engine controller sends a signal to the electronic throttle or the injector, so that the opening of the electronic throttle or the injection amount of the injector reaches a first set value, forcing the engine speed to be increased to a CVT continuously variable transmission device in a power-engaged state, while the engine idles and does not output driving torque to the outside, and the gearbox reverses the engine to achieve engine auxiliary braking. The engine auxiliary braking control system of the present invention can easily and reliably achieve vehicle engine auxiliary braking and slow driving on steep slopes, while improving safety and reducing the loss of the vehicle's braking system. The present invention also discloses a vehicle.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicle braking, and in particular, relates to an engine auxiliary braking control system and a vehicle. Background Art

[0002] At present, in the field of all-terrain vehicles (ATV, UTV) and scooters, the powertrain generally adopts the structure of engine + CVT continuously variable transmission device (usually rubber belt type) + gearbox. This power structure is simple and reliable. Figure 3 and Figure 4 Simple diagram of the CVT continuously variable transmission structure - the CVT driving wheel is connected to the engine crankshaft, the CVT driven wheel is connected to the gearbox, the power is transmitted from the engine to the gearbox through the CVT transmission belt, and then output to the vehicle wheels to drive the vehicle.

[0003] In a CVT continuously variable transmission device, a centrifugal clutch mechanism is generally provided on the CVT driving wheel or the CVT driven wheel. The vehicle driver can control the vehicle through the accelerator to accelerate and decelerate the vehicle. When the engine is idling or the speed is lower than a certain value, the CVT continuously variable transmission device is in a power separation state, and the power transmission between the engine and the gearbox and the entire vehicle is interrupted; when the engine speed increases to a certain value, the CVT continuously variable transmission device is in a power engagement state, and the engine transmits power to the gearbox through the CVT continuously variable transmission device to drive the vehicle.

[0004] When the vehicle brakes, the throttle is generally at zero, that is, the driver does not trigger the throttle. At this time, the engine speed is in idle state, the CVT continuously variable transmission device is in power separation state, and the power transmission between the engine and the transmission is interrupted. The vehicle speed can only be controlled by the vehicle's own braking system.

[0005] In summary, existing all-terrain vehicles (ATV, UTV) and scooters do not have engine-assisted braking functions. When the vehicle is traveling a long distance downhill or on a steep slope, if the brakes are applied for a long time, safety will be reduced and the wear on the braking system will increase. Summary of the invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides an engine auxiliary brake control system, the purpose of which is to improve driving safety and reduce the loss of the vehicle brake system.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an engine-assisted braking control system, including an engine controller and a vehicle brake switch, a vehicle speed sensor, a vehicle throttle position sensor, an engine speed sensor and an engine-assisted braking function button switch electrically connected to the engine controller; when the engine controller determines that the pre-set auxiliary braking trigger conditions are met, the engine controller sends a signal to the electronic throttle or the injector, so that the opening of the electronic throttle or the injection amount of the injector reaches a first set value, forcing the engine speed to be increased to the CVT continuously variable transmission device is in a power-engaged state, while the engine idles and does not output driving torque to the outside, and the gearbox reverses the engine to achieve engine-assisted braking.

[0008] The auxiliary braking triggering conditions include the driver turning on the engine auxiliary braking function button switch, the throttle opening reaching a second set value, the engine speed being lower than the engagement speed of the CVT continuously variable transmission device, the vehicle speed being higher than a third set value, and the driver performing a braking action.

[0009] When the engine controller determines that the preset auxiliary braking exit condition is met, the engine auxiliary braking function is exited.

[0010] The auxiliary braking exit condition includes the throttle opening being greater than a fourth set value.

[0011] The auxiliary braking exit condition includes the vehicle speed being lower than a fifth set value.

[0012] The auxiliary braking exit condition includes the driver turning off the engine auxiliary braking function button switch.

[0013] The present invention also provides a vehicle, comprising the engine assisted braking control system.

[0014] The vehicle is an all-terrain vehicle or a scooter.

[0015] The engine-assisted braking control system of the present invention can easily and reliably realize vehicle engine-assisted braking and slow-speed driving on steep slopes, thereby improving safety and reducing wear on the vehicle's braking system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] This specification includes the following drawings, which show the following contents:

[0017] Figure 1 It is a structural block diagram of the engine auxiliary brake control system of the present invention;

[0018] Figure 2 It is a control strategy flow chart of the engine auxiliary brake control system of the present invention;

[0019] Figure 3This is the front view of the CVT continuously variable transmission;

[0020] Figure 4 It is a top view of the CVT continuously variable transmission;

[0021] The markings in the figure are:

[0022] 1. Engine controller; 2. Vehicle brake switch; 3. Vehicle speed sensor; 4. Vehicle throttle position sensor; 5. Engine speed sensor; 6. Engine auxiliary brake function button switch; 7. Electronic throttle or injector; 8. CVT driving wheel; 9. CVT belt; 10. CVT driven wheel. DETAILED DESCRIPTION

[0023] The specific implementation methods of the present invention are further explained in detail below by describing the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solution of the present invention and facilitating its implementation.

[0024] like Figure 1 and Figure 2 As shown, the present invention provides an engine auxiliary braking control system, including an engine controller and a vehicle brake switch, a vehicle speed sensor, a vehicle throttle position sensor, an engine speed sensor and an engine auxiliary braking function button switch electrically connected to the engine controller; when the engine controller determines that a preset auxiliary braking trigger condition is met, the engine controller sends a signal to the electronic throttle (for gasoline engines) or the injector (for diesel engines), so that the opening of the electronic throttle or the injection amount of the injector reaches a first set value, forcing the engine speed to be increased to a CVT continuously variable transmission device that is in a power-engaged state, while the engine idles and does not output driving torque to the outside, and the vehicle reverses the engine to achieve engine auxiliary braking.

[0025] Specifically, if Figure 1 and Figure 2 As shown, during the operation of the vehicle, the engine controller (ECU) can monitor the vehicle brake signal, vehicle speed signal, engine speed signal, and vehicle throttle opening in real time through the engine wiring harness. The auxiliary braking trigger conditions include the driver turning on the engine auxiliary braking function button switch, the throttle opening reaching the second set value, the engine speed is lower than the combined speed of the CVT continuously variable transmission device, the vehicle speed is higher than the third set value, and the driver brakes. When all five conditions are met, the engine auxiliary braking and steep slope descent functions are triggered, thereby realizing engine auxiliary braking.

[0026] In the present invention, there is no need to change the hardware such as the engine, CVT continuously variable transmission device, and gearbox. Only an engine auxiliary braking function button switch needs to be added. The engine assisted downhill braking is achieved through an electronic control strategy. There is no need to change the hardware such as the engine, CVT continuously variable transmission device, and gearbox. Only the electronic control software needs to be changed, and the changes are small and can be implemented quickly.

[0027] When the vehicle driver turns on the engine auxiliary braking function switch and the vehicle is driving on a steep slope (or downhill), generally according to driving habits and behavioral logic, the vehicle driver will completely release the accelerator (or the accelerator is less than a certain opening), and brake and trigger the brake signal. The brake signal here can be a switch signal (the driver does not need to keep the brake and trigger the brake signal all the time). At the same time, the engine controller monitors that the vehicle speed is higher than a certain value, and the engine speed is lower than the engagement speed of the CVT continuously variable transmission. When all the above five conditions are met, the engine auxiliary braking and steep slope descent functions are triggered. At this time, the engine controller sends a signal to the electronic throttle or injector, so that the opening of the electronic throttle or the injection amount of the injector is in a certain appropriate state, forcing the engine speed to increase to the engagement state of the CVT continuously variable transmission, while the engine idles and does not output driving torque to the outside, thereby forcing the engine and the gearbox to achieve power connection, and the vehicle reverses the engine through the gearbox, relying on the engine's compression internal resistance to achieve engine downhill auxiliary braking.

[0028] When the vehicle is traveling on a flat road and brakes, if the engine controller determines that the pre-set auxiliary braking trigger conditions are met, engine auxiliary braking will also be implemented. The purpose is to prevent the vehicle from sliding in neutral (if the CVT continuously variable transmission device is in a disengaged state, this situation is equivalent to the vehicle in neutral) to ensure driving safety.

[0029] When the vehicle is driving uphill, based on driving habits and behavioral logic, the five conditions for downhill engine assisted braking will not be triggered, so this function is not involved in the vehicle's uphill driving conditions.

[0030] When the engine controller determines that the pre-set auxiliary brake exit conditions are met, the engine auxiliary brake function is exited. The auxiliary brake exit conditions are that the throttle opening is greater than the fourth set value, the vehicle speed is lower than the fifth set value, or the driver turns off the engine auxiliary brake function button switch. When the engine controller (ECU) monitors that the engine auxiliary brake function button switch is turned off, the throttle opening exceeds a certain value, and the vehicle speed is lower than a certain limit, that is, when any one of the three conditions is met, the engine auxiliary brake function is exited.

[0031] The specific process of exiting the engine assisted braking function is: first, according to driving habits and behavioral logic - if the throttle opening is greater than a certain value (the driver intends to accelerate or drive at a constant speed), exit the engine assisted braking function; secondly, if the vehicle speed is lower than a certain value (according to long-distance downhill or steep slope conditions, a safe downhill driving speed can be calibrated and set), exit the engine assisted braking function; finally, the engine assisted braking function can be exited by turning off the engine assisted braking function button switch.

[0032] The present invention also provides a vehicle, comprising the engine assisted brake control system of the above structure. The vehicle of the present invention comprises the engine assisted brake control system of the above embodiment, so it has all the advantages of the above engine assisted brake control system.

[0033] In this embodiment, the vehicle is an all-terrain vehicle or a scooter. The all-terrain vehicle can be an ATV or a UTV.

[0034] The present invention is described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention; or the above concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. An engine auxiliary brake control system, including an engine controller, a vehicle brake switch, a vehicle speed sensor, a vehicle throttle position sensor and an engine speed sensor, characterized in that: It also includes an engine auxiliary braking function button switch electrically connected to the engine controller; when the engine controller determines that a preset auxiliary braking trigger condition is met, the engine controller sends a signal to the electronic throttle or the injector, so that the opening of the electronic throttle or the injection amount of the injector reaches a first set value, forcing the engine speed to be increased to the CVT continuously variable transmission device in a power-engaged state, while the engine idles and does not output driving torque to the outside, and the gearbox reverses the engine to achieve engine auxiliary braking; The auxiliary braking triggering conditions include the driver turning on the engine auxiliary braking function button switch, the throttle opening reaching a second set value, the engine speed being lower than the engagement speed of the CVT continuously variable transmission device, the vehicle speed being higher than a third set value, and the driver performing a braking action.

2. The engine assisted brake control system according to claim 1, characterized in that: When the vehicle is traveling on a flat road and braking, if the engine controller determines that the pre-set auxiliary braking trigger conditions are met, engine assisted braking will also be implemented.

3. The engine assisted brake control system according to claim 1, characterized in that: When the engine controller determines that the preset auxiliary braking exit condition is met, the engine auxiliary braking function is exited.

4. The engine assisted brake control system according to claim 3, characterized in that: The auxiliary braking exit condition includes the throttle opening being greater than a fourth set value.

5. The engine assisted brake control system according to claim 3, characterized in that: The auxiliary braking exit condition includes the vehicle speed being lower than a fifth set value.

6. The engine assisted brake control system according to claim 3, characterized in that: The auxiliary braking exit condition includes the driver turning off the engine auxiliary braking function button switch.

7. A vehicle, characterized in that: It comprises the engine assisted braking control system as described in any one of claims 1 to 6.

8. The vehicle according to claim 7, characterized in that: The vehicle is an all-terrain vehicle or a scooter.

Images