JP2019113334A - vehicle - Google Patents

Abstract

To provide a vehicle capable of estimating a vehicle weight without using engine torque information.SOLUTION: A vehicle comprises: brake force calculating means 8 for calculating a brake force of a vehicle on the basis of a brake pressure of the vehicle; deceleration detecting means 2 for detecting a deceleration of the vehicle; and vehicle weight estimating means 9 for estimating a vehicle weight on the basis of the brake force calculated by the brake force calculating means 8 and the deceleration detected by the deceleration detecting means 2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle, and more particularly to a vehicle capable of performing vehicle weight estimation.

  Vehicle weight is important information used for vehicle attitude control and engine torque control, and it is generally performed to estimate the vehicle weight using engine torque information (see Patent Document 1).

Japanese Utility Model Application Publication No. 5-84834

  However, when the engine torque information is used to estimate the vehicle weight, if the accuracy of the engine torque information is deteriorated due to any cause, the accuracy of the estimated vehicle weight may be affected. In addition, if engine torque information can not be acquired due to a failure or the like of the vehicle, estimation of the vehicle weight is impossible. In these cases, the behavior and travel control of the vehicle including the vehicle attitude control based on the vehicle weight can not be strictly performed. Therefore, there is a need for a vehicle that can estimate the vehicle weight using information different from the engine torque information instead of relying solely on the engine torque information.

  The present invention has been made to solve at least a part of such a problem, and an object of the present invention is to provide a vehicle capable of estimating a vehicle weight without using engine torque information. .

  The present invention has been made to solve at least a part of the above-mentioned problems, and can be realized as the following aspects or application examples.

  The vehicle according to the application example includes a braking force calculation unit that calculates a braking force of the vehicle based on the brake pressure of the vehicle, a deceleration detection unit that detects a deceleration of the vehicle, and a braking force calculated by the braking force calculation unit. And vehicle weight estimation means for estimating the vehicle weight based on the degree of deceleration detected by the deceleration detection means.

  Thus, the weight of the vehicle can be estimated not by the engine torque information but by the braking information. Therefore, if the accuracy of the engine torque information is degraded due to any cause, or even if the engine torque information can not be obtained due to a failure of the vehicle, the vehicle weight is estimated and the behavior of the vehicle including the vehicle attitude control and Driving control can be performed.

It is a system configuration figure of the vehicles concerning one embodiment of the present invention.

  Hereinafter, a vehicle according to an embodiment of the present invention will be described based on the drawings.

  FIG. 1 is a system configuration diagram of a vehicle according to an embodiment of the present invention. The vehicle is equipped with a pressure sensor 1, an acceleration sensor (deceleration detecting means) 2, a vehicle state acquisition unit 3, a traveling control unit 4, and the like. The pressure sensor 1 detects, for example, a brake pressure as pressure information of the vehicle. The acceleration sensor 2 detects, for example, vehicle deceleration and road surface gradient as acceleration / deceleration information of the vehicle.

  The vehicle state acquisition unit 3 acquires, for example, an outer diameter of a tire, a running resistance, a brake coefficient, and the like as vehicle specifications set according to the vehicle specification and information of the vehicle state during traveling. The running resistance is mainly information on rolling resistance of wheels, but may include information on air resistance during running of a vehicle.

  Furthermore, the vehicle state acquisition unit 3 acquires information such as the number of times the brake is used during traveling of the vehicle, the traveling distance of the vehicle, the traveling speed of the vehicle, etc., and the temperature of brake pads and brake linings (not shown) presume. Then, the brake coefficient is corrected each time based on the estimated temperature of the brake.

  The traveling control unit 4 is configured of an electronic control unit (ECU) and controls the entire vehicle, and is mainly configured of a computer including, for example, a central processing unit (CPU) and a random access memory (RAM). There is. The driving control unit 4 is electrically connected to the driving unit 5, the braking unit 6, and the steering unit 7, and based on the information acquired from the pressure sensor 1, the acceleration sensor 2, and the vehicle state acquiring unit 3, By controlling 7, behavior and running control of the vehicle including vehicle attitude control are performed.

  The drive unit 5 is a part that drives the vehicle to travel, and is, for example, an engine. The braking unit 6 is a portion that brakes the vehicle, and includes, for example, a mechanical brake that generates a braking force by friction, an exhaust brake that generates a braking force other than friction, a retarder, a regenerative brake, and the like. The steering unit 7 is a part that steers the vehicle, and is, for example, a steering.

  Further, the travel control unit 4 is provided with a braking force calculation unit (braking force calculation means) 8 that calculates a braking force of the vehicle, and a vehicle weight estimation unit (vehicle weight estimation means) 9 that estimates the vehicle weight. The braking force calculation unit 8 receives the brake coefficient after temperature correction acquired by the vehicle state acquisition unit 3 and the brake pressure detected by the pressure sensor 1 and performs a calculation by multiplying the brake coefficient by the brake pressure Calculate the braking force of Note that only the brake pressure may be calculated as the braking force.

  The vehicle weight estimation unit 9 receives the braking force calculated by the braking force calculation unit 8 and the vehicle deceleration detected by the acceleration sensor 2 and performs a calculation to divide the braking force by the vehicle deceleration. Calculate and estimate the weight. The vehicle weight estimation unit 9 also receives information on the road surface gradient detected by the acceleration sensor 2, the tire outer diameter acquired by the vehicle condition acquisition unit 3, and the running resistance, and the information related to braking of these vehicles is In the case of weight estimation, it is used for correction of vehicle weight.

  The vehicle weight estimation unit 9 in FIG. 1 determines the vehicle weight from the braking force calculation unit 8, the vehicle deceleration, the road surface gradient, the tire outer diameter, the running resistance, and the braking coefficient (number of brakes, running distance, running speed) However, the vehicle weight may be determined from at least the braking force calculation unit 8 and the vehicle deceleration, and other items can be adopted as appropriate.

  As described above, in the present embodiment, the vehicle weight estimation unit is calculated from the braking force of the vehicle calculated by the braking force calculation unit 8 based on the brake pressure detected by the pressure sensor 1 and the vehicle deceleration degree detected by the acceleration sensor 2 Estimate the weight of the vehicle at 9. Thus, it is possible to estimate the weight of the vehicle not by engine torque information but by so-called brake braking information.

  Therefore, even if engine torque information can not be acquired if the accuracy of the engine torque information is deteriorated due to any cause or if a failure of the vehicle, for example, a communication error of the traveling control unit 4 or the like can not be obtained, engine torque information is used. Therefore, it is possible to accurately estimate the weight of the vehicle and strictly control the behavior and travel of the vehicle including the vehicle attitude control.

  In particular, in the case of vehicle weight estimation based on the braking information according to the present embodiment, the braking unit 6 automatically applies a brake when the vehicle is in a posture that may cause skidding or rolling during traveling of the vehicle. It can be stopped quickly. Therefore, since the vehicle attitude control completed in the brake system can be performed, it is possible to accurately and quickly realize the behavior and the traveling control of the vehicle involved in the vehicle braking with higher affinity.

  This completes the description of the embodiments of the present invention, but the aspects of the present invention are not limited to this embodiment.

  For example, in the above embodiment, the vehicle weight is estimated using braking information instead of engine torque information. However, on the premise that engine torque information is used as in the prior art, vehicle weight estimation may be performed using the braking force information supplementarily. Thus, the vehicle weight can be estimated more accurately than in the prior art.

  Further, the vehicle weight may be estimated by switching from the engine torque information to the brake braking information only when the accuracy of the engine torque information is deteriorated or the engine torque information can not be obtained. Thus, the reliability of the vehicle can be further improved because it is excluded so that the vehicle weight can not be estimated and the vehicle attitude control can not be performed.

  Further, the information used to correct the vehicle weight estimated by the vehicle weight estimation unit 9 uses other information regarding brake braking other than the vehicle specifications and information of the vehicle condition acquired by the vehicle condition acquisition unit 3 described above. Also good.

  Moreover, various vehicles, such as a passenger car and a truck, can be assumed as vehicles explained by this embodiment.

  The drive unit 5 is not limited to an engine, and may be an electric motor or a hybrid including an engine and an electric motor. In the case of the electric-powered vehicle, since there is no engine torque information, vehicle attitude control can be suitably performed by the vehicle weight estimation of the present embodiment based on the information related to brake braking. In the case of a hybrid vehicle, the vehicle attitude control may be performed by the vehicle weight estimation of this embodiment only when the drive unit 5 is switched from the engine to the electric motor.

2 Acceleration sensor (deceleration detection means)
8 Braking Force Calculator (Braking Force Calculator)
9 Vehicle weight estimation unit (vehicle weight estimation means)

Claims (1)

Braking force calculation means for calculating the braking force of the vehicle based on the brake pressure of the vehicle;
Deceleration detection means for detecting the deceleration of the vehicle;
A vehicle comprising: vehicle weight estimation means for estimating a vehicle weight based on the braking force calculated by the braking force calculation means and the degree of deceleration detected by the deceleration detection means.

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