Heavy truck long downhill accessory control method

Abstract

The invention discloses a heavy truck long downhill accessory control method. The method comprises the following steps: calculating predicted recoverable electric quantity of a long downhill road section; and when the expected recoverable electric quantity of the long downhill road section is larger than the electric quantity needed for full charging of the current vehicle battery, the vehicle-mounted water cooling assembly is controlled to enter a full-power operation mode, the inflating threshold value of the brake air pump is increased to be higher than the flat road working condition, and the actual target temperature and wind power ratio set value of the air conditioner is adjusted according to the current season. The maximum utilization of energy recovered under the long downhill working condition is achieved, and meanwhile safe driving of the whole vehicle under the complex working condition is guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of new energy heavy truck technology, and in particular relates to a control method for accessories on long downhill slopes of heavy trucks. Background Technology

[0002] The market share of new energy heavy-duty trucks is expanding, with pure electric heavy-duty trucks becoming increasingly popular across various industries due to their higher economic efficiency compared to gasoline-powered vehicles. Taking the mountainous areas of southwest China as an example, under unloaded uphill and heavily loaded downhill conditions, the vehicle's energy consumption and recovery can be balanced, or even generate more electricity. However, this also brings a series of vehicle operation problems. For instance, under long downhill conditions, the vehicle's recovery power is greater under heavy load. During the downhill process, when the vehicle's battery charge is high, the recovery current is limited, which leads to a limitation in the vehicle's electric braking power. Furthermore, the control of onboard accessories has not been combined with actual operating conditions to maximize the utilization of the vehicle's energy, affecting driving safety and energy economy under long downhill conditions. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a control method for heavy truck accessories on long downhill slopes, so as to maximize the utilization of recovered energy in long downhill conditions and ensure the safe operation of the vehicle under complex conditions.

[0004] To solve the above-mentioned technical problems, the present invention is implemented using the following solution: This invention provides a method for controlling attachments on heavy-duty trucks on long downhill slopes, comprising: Calculate the estimated recoverable electricity on long downhill road sections; When the expected recoverable electricity on a long downhill section is greater than the amount of electricity required to fully charge the current heavy truck battery, the vehicle's water-cooling components are controlled to enter full-power operation mode, the brake pump inflation threshold is increased to be higher than that on flat roads, and the actual target temperature and wind speed ratio of the air conditioner are adjusted according to the current season.

[0005] Furthermore, the estimated recoverable electricity on long downhill sections is calculated, including: Calculate the estimated recoverable electricity from the long downhill section based on its length, gradient, and the weight of the heavy truck.

[0006] Furthermore, the length of the long downhill section was estimated by identifying long downhill road conditions using a heavy truck vehicle map.

[0007] Furthermore, the slope of the long downhill section is obtained by detecting the slope of the long downhill section using a slope sensor mounted on a heavy truck.

[0008] Furthermore, the weight of the heavy truck is estimated using the truck's acceleration signal.

[0009] Furthermore, the actual target temperature and fan speed ratio of the air conditioner are adjusted according to the current season, including: When turning on the air conditioner in summer, adjust the actual target temperature of the air conditioner to be lower than the set temperature by a first set threshold, and the fan speed to be higher than the set value by a second set threshold. When turning on the air conditioner in winter, adjust the actual target temperature to be higher than the set temperature by a first set threshold, and the fan speed to be higher than the set value by a second set threshold.

[0010] Furthermore, the first set threshold is 2-3℃.

[0011] Furthermore, it also includes: when the expected recoverable electricity on a long downhill section is greater than the amount of electricity required to fully charge the current heavy truck battery, the heavy truck accessories are controlled to execute the original control logic to work. Beneficial effects

[0012] When the recoverable energy of a vehicle exceeds the amount of energy required to fully charge the battery during long downhill driving conditions, the vehicle accessories enter a special control mode: water pumps, fans, and other water-cooled unit accessories enter full-power operation mode, consuming the vehicle's energy in advance while reducing system temperature; the brake air pump inflation threshold is increased (higher than on flat roads), ensuring vehicle braking safety during downhill driving while consuming the vehicle's recovered energy; in summer, when the air conditioner is on, the actual target temperature is lower than the set temperature by a certain threshold (2~3℃), and the fan speed is higher than the set value by a certain threshold; in winter, when the heater is on, the actual target temperature is higher than the set temperature by a certain threshold (2~3℃), and the fan speed is higher than the set value by a certain threshold.

[0013] This invention, when a vehicle enters a long downhill section, estimates the length of the downhill section based on map identification, detects the slope of the long downhill section using a heavy-duty truck-mounted slope sensor, and estimates the vehicle weight using the truck's acceleration signal. Based on the slope length, slope value, and vehicle weight, the invention can estimate the amount of electricity that the vehicle is expected to recover during the long downhill process.

[0014] This invention enables new energy heavy-duty trucks to avoid excessive battery recovery during long downhill driving conditions, which could affect the electric braking effect. At the same time, the excess energy is used for accessory consumption, improving the vehicle's driving safety and adaptability in complex road conditions. Attached Figure Description

[0015] Figure 1 This is a framework diagram of a heavy-duty truck long downhill accessory control method provided in an embodiment of the present invention. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention. Example 1

[0017] like Figure 1 As shown, this embodiment provides a method for controlling attachments on a heavy-duty truck during long downhill sections, including the following steps: Calculate the estimated recoverable electricity on long downhill road sections; When the expected recoverable electricity on a long downhill section is greater than the amount of electricity required to fully charge the current heavy truck battery, the vehicle's water-cooling components are controlled to enter full-power operation mode, the brake pump inflation threshold is increased to be higher than that on flat roads, and the actual target temperature and wind speed ratio of the air conditioner are adjusted according to the current season.

[0018] This heavy-duty truck long downhill accessory control method avoids excessive battery recovery power in long downhill conditions of new energy heavy-duty trucks, which would affect the electric braking effect. At the same time, it uses the excess energy for accessory consumption, improving the vehicle's driving safety and adaptability in complex road conditions. Example 2

[0019] like Figure 1 As shown, this embodiment provides a method for controlling accessories on long downhill slopes for heavy trucks. Based on map, slope and vehicle weight identification, the expected energy recovery of the vehicle under long downhill conditions is estimated. Combined with the current remaining battery power, it is determined whether the vehicle enters the accessory special control mode.

[0020] Road condition recognition: New energy heavy trucks can identify long downhill road conditions based on maps, estimate the length of downhill sections, detect the slope of downhill sections using slope sensors, and simultaneously estimate the total weight of the vehicle and cargo. Mode determination: Based on the estimated length, gradient, and vehicle weight of the long downhill section, the estimated recoverable energy of the long downhill section is calculated. At the same time, based on the current battery SOC value, it is determined whether the estimated recoverable energy of the long downhill section is greater than the energy required to fully charge the battery. When the estimated recoverable energy of the long downhill section is greater than the energy required to fully charge the battery, the vehicle accessory control enters a special control mode; otherwise, it does not enter the mode. Accessory control: Water pumps, fans, and other water-cooled unit accessories enter full-power operation mode, consuming the vehicle's energy in advance and reducing system temperature; the brake air pump inflation threshold is increased (higher than on flat roads), ensuring vehicle braking safety on downhill sections while consuming the vehicle's energy recovery; in summer, when the air conditioner is on, the actual target temperature is lower than the set temperature by a certain threshold (2~3℃), and the fan speed is higher than the set value by a certain threshold; in winter, when the heater is on, the actual target temperature is higher than the set temperature by a certain threshold (2~3℃), and the fan speed is higher than the set value by a certain threshold.

[0021] When the map identifies that the vehicle has left a long downhill section or the estimated amount of recovered energy does not exceed the amount of energy required to fully charge the battery, the vehicle accessories exit the special control mode and continue to be controlled according to the original control logic. For example, the water pump and fan determine the current motor or battery temperature. When the temperature reaches the working threshold, the water pump and fan turn on; when the temperature drops to the shutdown threshold, the water pump and fan stop working; the water pump and fan operate at a fixed frequency or at a variable frequency according to the temperature.

[0022] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for controlling attachments on heavy-duty trucks on long downhill slopes, characterized in that, include: Calculate the estimated recoverable electricity on long downhill road sections; When the expected recoverable electricity on a long downhill section is greater than the amount of electricity required to fully charge the current heavy truck battery, the vehicle's water-cooling components are controlled to enter full-power operation mode, the brake pump inflation threshold is increased to be higher than that on flat roads, and the air conditioning actual target temperature and wind speed ratio setting is adjusted according to the current season.

2. The heavy-duty truck long downhill accessory control method according to claim 1, characterized in that, Calculate the estimated recoverable electricity on long downhill sections, including: Calculate the estimated recoverable electricity from the long downhill section based on its length, gradient, and the weight of the heavy truck.

3. The heavy-duty truck long downhill accessory control method according to claim 2, characterized in that, The length of the long downhill section was estimated by identifying long downhill road conditions using a heavy truck vehicle map.

4. The heavy-duty truck long downhill accessory control method according to claim 2, characterized in that, The slope of long downhill sections is obtained by detecting the slope of long downhill sections using a slope sensor mounted on a heavy truck.

5. The heavy-duty truck long downhill accessory control method according to claim 2, characterized in that, The weight of a heavy truck is estimated using its acceleration signal.

6. The heavy-duty truck long downhill accessory control method according to claim 1, characterized in that, Adjust the air conditioner's actual target temperature and fan speed ratio setting according to the current season, including: When turning on the air conditioner in summer, adjust the actual target temperature of the air conditioner to be lower than the set temperature by a first set threshold, and the fan speed to be higher than the set value by a second set threshold. When turning on the air conditioner in winter, adjust the actual target temperature to be higher than the set temperature by a first set threshold, and the fan speed to be higher than the set value by a second set threshold.

7. The heavy-duty truck long downhill accessory control method according to claim 6, characterized in that, The first set threshold is 2-3℃.

8. The heavy-duty truck long downhill accessory control method according to claim 1, characterized in that, Also includes: When the estimated recoverable electricity on a long downhill section is greater than the amount of electricity required to fully charge the current heavy truck battery, the control system will execute the original control logic for the heavy truck accessories.

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