An adaptive cruise control method taking vehicle load into consideration

Abstract

The present invention belongs to the field of automotive electronics technology, and specifically relates to an adaptive cruise control system and method that takes vehicle load into consideration. The present invention takes into consideration different vehicle loads to perform acceleration and deceleration control of the adaptive cruise control system. The adaptive cruise control acceleration and deceleration control is first calibrated based on an intermediate load, i.e., a half-loaded vehicle. The vehicle's load factor is then determined based on different load information. The desired effects of the adaptive cruise control system under different operating conditions, such as cruise acceleration, fixed-speed cruise acceleration, and following cruise deceleration, are considered. The load factor is then multiplied by different parameter variables to ensure the comfort and safety of the system control.

Description

Technical Field

[0001] The present invention belongs to the technical field of automotive electronics, and in particular relates to an adaptive cruise control system and method that takes vehicle load into consideration. Background Art

[0002] Adaptive cruise control (ACC) is a longitudinal automatic vehicle control system that automatically controls the vehicle's acceleration and deceleration, significantly reducing driver fatigue and improving driving comfort. Based on radar and camera modules installed at the front of the vehicle, the ACC detects the relative distance and speed of the target vehicle and controls the vehicle's speed. This allows the vehicle to maintain the desired speed set by the driver, as well as the driver-set timed distance from the vehicle ahead, known as the following distance. However, current ACC systems, which control the vehicle's speed based on the relative distance and speed of the target vehicle, do not consider the impact of vehicle load on acceleration and deceleration control. This is particularly true for commercial vehicles, which have large load variations. This results in poor cruise control acceleration and deceleration, impacting system safety and warrants further optimization and improvement. Summary of the Invention

[0003] To address the above issues, the present invention proposes an adaptive cruise control acceleration and deceleration method that takes vehicle load into account. The ACC system acquires vehicle load information in real time and, based on different vehicle load conditions, measures the time required for the vehicle to reach the desired acceleration and deceleration values ​​under the same acceleration and deceleration request. Using a half-loaded vehicle as a benchmark, the vehicle's load factor is determined by the time required to achieve the desired acceleration and deceleration values ​​under different load conditions. The specific technical solution is as follows:

[0004] An adaptive cruise control method for acceleration and deceleration taking vehicle load into consideration includes the following steps:

[0005] (1) The vehicle load calculation unit obtains the vehicle load information, measures the vehicle load information by measuring the vehicle deformation under different loads, and sends the load information to the ACC module;

[0006] (2) Based on different vehicle load conditions, measure the time required for the vehicle to reach the expected acceleration and deceleration values ​​under the same acceleration and deceleration request;

[0007] (3) The ratio of the time required for the vehicle to achieve the desired acceleration and deceleration at different loads to the time required for the vehicle to achieve the desired acceleration and deceleration when half loaded, to confirm the load factor of the vehicle at different loads;

[0008] (4) The ACC system uses radar and camera modules to obtain real-time information about the relative speed and distance between the target vehicle in front and the vehicle itself, and obtains the vehicle's speed information through the wheel speed sensor.

[0009] (5) The ACC system calculates the following distance and safe braking distance of the vehicle based on the distance and speed between the vehicle and the target vehicle;

[0010] (6) Calibrate the acceleration and deceleration values ​​and slope required to maintain a safe following distance from the target vehicle under different operating conditions when the vehicle is half-loaded;

[0011] (7) According to the vehicle load, the variables requested by ACC under different working conditions are multiplied by the corresponding load coefficient for correction.

[0012] Furthermore, different operating conditions include ACC cruise acceleration, ACC fixed speed cruise deceleration and ACC following cruise deceleration.

[0013] Furthermore, ACC cruise acceleration: In the case of ACC acceleration control, the acceleration torque requested by ACC is multiplied by the load factor of the corresponding load so that ACC can reach the set cruising speed more quickly or maintain the set following distance with the vehicle in front.

[0014] Furthermore, ACC cruise control deceleration: During ACC cruise control, when decelerating to reach the cruising speed set by the driver, the deceleration slope requested by ACC is multiplied by the load factor of the corresponding load so that ACC can reach the desired speed as quickly as possible.

[0015] Furthermore, ACC cruise deceleration: When ACC cruise deceleration is in progress, in order to maintain a safe distance from the vehicle in front to prevent collision, the ACC safe braking distance is multiplied by the load factor of the corresponding load so that the system can brake in advance, ensuring both comfort and safety performance of the system.

[0016] Furthermore, the vehicles at different loads include at least empty vehicles, half-loaded vehicles, and fully loaded vehicles. Samples may also be selected based on load increments, such as increments of 10% load or 5% load.

[0017] The present invention calibrates the load factor under different load states and uses the load factor as a correction factor to correct the ACC request variable under different working conditions to optimize the acceleration and deceleration control of the cruise control system, ensuring vehicle safety and optimizing the riding experience of the driver and passengers. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the process flow of the present invention. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] like Figure 1 As shown, an adaptive cruise control method for acceleration and deceleration taking into account vehicle load includes the following steps:

[0021] (1) The vehicle load calculation unit obtains the vehicle load information, measures the vehicle load information by measuring the vehicle deformation under different loads, and sends the load information to the ACC module;

[0022] (2) Based on different vehicle load conditions, measure the time required for the vehicle to reach the expected acceleration and deceleration values ​​under the same acceleration and deceleration request;

[0023] (3) The ratio of the time required for the vehicle to achieve the desired acceleration and deceleration at different loads to the time required for the vehicle to achieve the desired acceleration and deceleration when half loaded, to confirm the load factor of the vehicle at different loads;

[0024] (4) The ACC system uses radar and camera modules to obtain real-time information about the relative speed and distance between the target vehicle in front and the vehicle itself, and obtains the vehicle's speed information through the wheel speed sensor.

[0025] (5) The ACC system calculates the following distance and safe braking distance of the vehicle based on the distance and speed between the vehicle and the target vehicle;

[0026] (6) Calibrate the acceleration and deceleration values ​​and slope required to maintain a safe following distance from the target vehicle under different operating conditions when the vehicle is half-loaded;

[0027] (7) According to the vehicle load, the variables requested by ACC under different working conditions are multiplied by the corresponding load coefficient for correction.

[0028] Different working conditions include ACC cruise acceleration, ACC fixed-speed cruise deceleration and ACC following cruise deceleration; the details are as follows: ACC cruise acceleration: Under ACC acceleration control, the acceleration torque requested by ACC is multiplied by the load factor of the corresponding load so that ACC can reach the set cruising speed faster or maintain the set following time distance with the vehicle in front.

[0029] ACC cruise control deceleration: When ACC cruise control is used and the vehicle is decelerating to reach the cruising speed set by the driver, the deceleration slope requested by ACC is multiplied by the load factor of the corresponding load so that ACC can reach the desired speed as quickly as possible.

[0030] ACC cruise control deceleration: When ACC cruise control decelerates, in order to prevent collision and maintain a safe distance from the vehicle in front, the ACC safe braking distance is multiplied by the load factor of the corresponding load so that the system can brake in advance, ensuring both comfort and safety performance of the system.

[0031] The different load weights of a vehicle include at least an empty vehicle, a half-loaded vehicle and a fully loaded vehicle.

[0032] The above describes in detail the preferred embodiments of this patent, but this patent is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in this field without departing from the purpose of this patent.

Claims

1. An adaptive cruise control method for acceleration and deceleration taking vehicle load into consideration, characterized by: The steps include: (1) The vehicle load calculation unit obtains the vehicle load information, measures the vehicle load information by measuring the vehicle deformation under different loads, and sends the load information to the ACC module; (2) Based on different vehicle load conditions, measure the time required for the vehicle to reach the expected acceleration and deceleration values ​​under the same acceleration and deceleration request; (3) The ratio of the time required for the vehicle to achieve the desired acceleration and deceleration at different loads to the time required for the vehicle to achieve the desired acceleration and deceleration when half loaded, to confirm the load factor of the vehicle at different loads; (4) The ACC system uses radar and camera modules to obtain real-time information about the relative speed and distance between the target vehicle in front and the vehicle itself, and obtains the vehicle's speed information through the wheel speed sensor. (5) The ACC system calculates the following distance and safe braking distance of the vehicle based on the distance and speed between the vehicle and the target vehicle; (6) Calibrate the acceleration and deceleration values ​​and slope required to maintain a safe following distance from the target vehicle under different operating conditions when the vehicle is half-loaded; (7) According to the vehicle load, the variables requested by ACC under different working conditions are multiplied by the corresponding load coefficient for correction.

2. The adaptive cruise control acceleration and deceleration method taking vehicle load into consideration according to claim 1, characterized in that: Different operating conditions include ACC cruise acceleration, ACC fixed speed cruise deceleration and ACC following cruise deceleration.

3. The adaptive cruise control acceleration and deceleration method taking vehicle load into consideration according to claim 2, characterized in that: ACC cruise acceleration: In the case of ACC acceleration control, the acceleration torque requested by ACC is multiplied by the load factor of the corresponding load.

4. The adaptive cruise control acceleration and deceleration method taking vehicle load into consideration according to claim 2, characterized in that: ACC cruise control deceleration: In ACC cruise control, multiply the deceleration slope requested by ACC by the load factor of the corresponding load.

5. The adaptive cruise control acceleration and deceleration method taking vehicle load into consideration according to claim 2, characterized in that: ACC cruise deceleration: When ACC cruise deceleration is in effect, multiply the ACC safe braking distance by the load factor of the corresponding load.

6. The adaptive cruise control acceleration and deceleration method taking vehicle load into consideration according to claim 1, characterized in that: The different load weights of a vehicle include at least an empty vehicle, a half-loaded vehicle and a fully loaded vehicle.

7. The adaptive cruise control acceleration and deceleration method taking vehicle load into consideration according to claim 1, characterized in that: The selection of vehicles at different loads is based on the selection of samples according to different load increments, with the increment being 10% of the load or 5% of the load.

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