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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 12673-1990 Motor vehicles - Basic dimensions - Measuring method. In addition to editorial changes, the following main technical changes have been made with respect to GB/T 12673-1990:
——the application scope in Clause 1 is modified (see Clause 1);
——the reference to GB 1589, GB/T 19514 and GB/T 29120-2012 is added in Clause 2 (see Clause 2);
——the contents of Clause 3 are modified: definitions of vehicle coordinate system (see 3.1), H-point and H-point measurement machine (see 3.2), passenger reference point and reference plane (see 3.3), seating type (see 3.4), vehicle body design terms (see 3.5), gross vehicle mass (see 3.6), dimension codes (see 3.7), head contour and head position contour (see 3.8) are added;
——the contents of Clause 4 are modified: vehicle state (see 4.2) and measurement basis (see 4.3) are added, and measuring instruments and apparatus is changed as precision requirements for measuring tools (see 4.4);
——the contents of Clause 5 are modified: the codes and definitions for dimension parameters of angle, seating dimension, luggage compartment/cargo volume and H-point travel path are added (see 5.1); digital segmentation is modified (see 5.2); internal dimension suffix (see 5.3.1), external dimension suffix (see 5.3.2), luggage compartment/cargo dimension suffix (see 5.3.3) and special suffix (see 5.3.4) are added;
——the contents of Clause 6 are modified: H136 is changed to H136-1, H137 is changed to H136-2, L127 and L128 are changed to L128-1 and L128-2, and the load condition is deleted (see 6.1); the condition of "full load" is deleted and the "maximum gross weight" is changed to "gross vehicle mass" (see 6.3);
——the contents of Clause 7 are modified: "internal dimension - length" (see 7.1), "internal dimension - width" (see 7.2), "internal dimension - height" (see 7.3), "internal dimension - angle" (see 7.4), "internal dimension - seating" (see 7.5), and "internal dimension - H-point travel path" (see 7.6) are added;
——the contents of Clause 8 are modified: some load conditions are deleted; the relevant requirements of GB 1589 serve as reference to "vehicle length" (see 8.1); the relevant requirements of GB 1589 serve as reference to “vehicle width” (see 8.2); the definition of "vehicle height" is revised and the measurement method of "vehicle height" under full load is deleted; the relevant requirements of GB 1589 serve as reference to “vehicle height” (see 8.3); "external angle" is added (see 8.4);
——the contents of Clause 9 are modified: some cargo dimension measurement methods are added and some cargo dimension measurement methods are re-edited (see Clause 9);
——Annex A “Head contour and its positioning of driver and passengers” is added;
——Annex B “H-point travel path” is added;
——Annex C “Structure diagrams for determination method of seating type and measurement method of L48 and L51” is added;
——some attached drawings in Annex D are added.
This standard was proposed by the Ministry of Industry and Information Technology of the People's Republic of China.
This standard is under the jurisdiction of the National Technical Committee of Auto Standardization (SAC/TC 114).
The previous edition of this standard is as follows:
——GB/T 12673-1990.
Motor vehicle main dimensions measurement method
1 Scope
This standard specifies the measurement methods for motor vehicle main dimensions.
The measurement methods for external dimensions and luggage compartment/cargo dimensions specified in this standard are applicable to Categories M and N vehicles. It may also serve as a reference for other vehicles.
The measurement methods for internal dimensions specified in this standard are applicable to Category M1 vehicles. It may also serve as a reference for other vehicles.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB 1589 Limits of dimensions, axle load and masses for motor vehicles, trailers and combination vehicles
GB/T 3730.2 Road vehicle - Masses - Vocabulary and codes
GB/T 3730.3-1992 Motor vehicles and towed vehicles - Dimensions of vehicles - Terms and definitions
GB/T 19514 Passenger cars - Luggage compartments - Method of measuring reference volume
GB/T 29120-2012 Procedure for H-point and R-point determination
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB 1589, GB/T 3730.2, GB/T 3730.3-1992, GB/T 29120-2012 as well as the following apply. For the convenience of application, some terms and definitions specified in GB/T 29120-2012 are listed below.
3.1
vehicle coordinate system
system composed of three vertical orthogonal planes that are interrelated, which is used to determine the positional relation of planes, axes and points, as shown in Figure 1
Figure 1 Vehicle coordinate system
3.1.1
zero Y-plane
longitudinal symmetry plane of vehicle specified in 2.4, GB/T 3730.3-1992
3.1.2
zero X-plane
plane perpendicular to the zero Y-plane specified by the manufacturer
3.1.3
zero Z-plane
plane perpendicular to the zero Y-plane and zero X-plane specified by the manufacturer
3.1.4
Y-plane
plane parallel to the zero Y-plane
3.1.5
X-plane
plane parallel to the zero X-plane
3.1.6
Z-plane
plane parallel to the zero Z-plane
3.1.7
X-axis direction
direction parallel to the normal of X-plane
3.1.8
Y-axis direction
direction parallel to the normal of Y-plane
3.1.9
Z-axis direction
direction parallel to the normal of Z-plane
3.1.10
base point, base line, zero plane
three or more actual points, lines or planes specified by the manufacturer
3.2 H-point and H-point measurement machine
3.2.1
H-point
for HPM, H-point is the rotation center of torso and thigh, which is the simulated hinge center of human torso and thigh, and is used to determine the actual H-point of seating; for HPM-II, H-point is the hinge center point of seating panel assembly and back panel assembly and is located on the lateral centerline of HPM-II or HPD
Notes:
1 For HPM, H-point is located on the central plane of HPM and at the midpoint of the line connecting the H-point marking buttons on both sides of the machine.
2 For HPM-II, H-point is also the intersection of the seating cushion line and the torso line. Where HPM-II is properly placed on the vehicle, the position of H-point relative to the vehicle serves as the base point of vehicle whatever in CAD or actual physical machine. If the seating is moved, the position of H-point of the vehicle will change accordingly. Therefore, the adjustable seating has more than one H-point position, while the fixed seating has only one H-point position.
3 Generally, H-point refers to the hip point or hip hinge point, but it does not accurately represent the position of the hip articulation point of a person.
[GB/T 29120-2012, Definition3.3]
3.2.2
actual H-point
for HPM, the seating is located at the seating base point designated by the manufacturer. Where the appropriate leg length is adopted for HPM, actual H-point refers to the H-point measured at the hinge center of torso line and thigh bar centerline. For HPM-II, the seating is located at the seating base point designated by the manufacturer. Where the appropriate posture is adopted for HPM-II, actual H-point refers to the H-point measured at the hinge center of seating panel assembly and back panel assembly
[GB/T 29120-2012, Definition 3.3.2]
3.2.3
R-point
design H-point position set by the manufacturer, which is also referred as SgRP, shall meet all the following requirements:
a) basic base point for establishing passenger adjustment tools and dimensions;
b) simulating the hinge center position of torso and thigh of a human body;
c) provided with coordinates established with respect to the structure of the designed vehicle;
d) establishing the H-point at the back of each designated seating position or at the normal driving and seating position designated by the manufacturer, which includes all adjustment states of the seating, including horizontal, vertical and inclined states, but does not include seating movement for abnormal driving and seating purposes
3.2.4
H-point travel path
all possible positions of H-point of the seating at designated seating position under all adjustment states (including horizontal, vertical and inclined states)
[GB/T 29120-2012, Definition 3.9]
3.2.5
three-dimensional H-point machine; HPM
machine used for determining actual H-point and actual torso angle of vehicle
[GB/T 29120-2012, Definition 3.1]
3.2.6
three-dimensional H-point machine-II; HPM-II
new SAE (Society of Automotive Engineers) H-point machine, which is used to determine the actual H-point, actual torso angle and other parameter values of vehicles more accurately. Compared with HPM, HPM-II has improved repeatability, which makes it more convenient to use, some additional components are added, the measurement capability is enhanced, and the impact of these improvements on the base point position and other measurement values is minimized, as shown in Figure 2
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Measurement preparation
5 Dimension codes
6 Determination of zero plane and base point
7 Dimension code, name and measurement method of internal dimensions
8 Code, name and measurement method of external dimension
9 Code, name and measurement method of luggage compartment/cargo dimension
Annex A (Informative) Head contour and its positioning for driver and passengers
Annex B (Normative) H-point travel path
Annex C (Normative) Structure diagrams for determination method of seating type and measurement method of L48 and L
Annex D (Informative) Attached figures
